10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2014

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 000-51026

Monolithic Power Systems, Inc.

(Exact name of registrant as specified in its charter)

Delaware	77-0466789
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

79 Great Oaks Boulevard, San Jose, CA 95119 (408) 826-0600

(Address of principal executive offices, including zip code and telephone number)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, $0.001 Par Value	The NASDAQ Global Select Market

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act of 1933.☒ Yes ☐ No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 (the “Exchange Act”).☐ Yes ☒ No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

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Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  ☒  No  ☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  ☒        Accelerated filer ☐      Non-accelerated filer  ☐          Smaller reporting company  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). ☐ Yes   ☒ No

The number of shares of the registrant’s stock outstanding as of June 30, 2014 was 38,774,391.  The closing price of the registrant’s common stock on the Nasdaq Global Select Market on June 30, 2014 was $42.35.  The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant based upon the closing price of the Common Stock on the Nasdaq Global Select Market on June 30, 2014 was $946.0 million.*

There were 39,290,882 shares of the registrant’s common stock issued and outstanding as of February 23, 2015.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the registrant’s 2015 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K to the extent stated herein.  The Proxy Statement will be filed within 120 days of the registrant’s fiscal year ended December 31, 2014.  

* Excludes 16,437,858 shares of the registrant’s common stock held by executive officers, directors and stockholders whose ownership exceeds 5% (“affiliates”) of the Common Stock outstanding at June 30, 2014.  Exclusion of such shares should not be construed to indicate that any such person possesses the power, direct or indirect, to direct or cause the direction of the management or policies of the registrant or that such person is controlled by or under common control with the registrant.

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MONOLITHIC POWER SYSTEMS, INC.

TABLE OF CONTENTS

		Page
	PART I
Item 1.	Business	5
	Executive Officers of the Registrant	9
Item 1A	Risk Factors	10
Item 1B	Unresolved Staff Comments	24
Item 2.	Properties	24
Item 3.	Legal Proceedings	24
Item 4.	Mine Safety Disclosures	24
	PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	25
Item 6.	Selected Financial Data	27
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	28
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	37
Item 8.	Financial Statements and Supplementary Data	38
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	70
Item 9A.	Controls and Procedures	70
Item 9B.	Other Information	72
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	72
Item 11.	Executive Compensation	72
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	72
Item 13.	Certain Relationships and Related Transactions, and Director Independence	72
Item 14.	Principal Accountant Fees and Services	72
	PART IV
Item 15	Exhibits and Financial Statement Schedules	73
	Signatures	76

Except as the context otherwise requires, the terms “Monolithic Power Systems”, “MPS”, “Registrant”, “Company”, “we”, “us”, or “our” as used herein are references to Monolithic Power Systems, Inc. and its consolidated subsidiaries.

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FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K and the documents incorporated herein by reference contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, that have been made pursuant to and in reliance on the provisions of the Private Securities Litigation Reform Act of 1995. These statements include among other things, statements concerning:

• the above-average industry growth of product and market areas that we have targeted,

• our plan to increase our revenue through the introduction of new products within our existing product families as well as in new product categories and families,

• our intention to exercise our purchase option with respect to our manufacturing facility in Chengdu, China,

• our belief that we will continue to incur significant legal expenses that vary with the level of activity in each of our legal proceedings,

• the effect that liquidity of our investments has on our capital resources,

• the continuing application of our products in the communications, storage and computing, consumer and industrial markets, which account for a majority of our revenue,

• estimates of our future liquidity requirements,

• the cyclical nature of the semiconductor industry,

• protection of our proprietary technology,

• near-term business outlook for 2015 and beyond,

• the factors that we believe will impact our ability to achieve revenue growth,

• the outcome of the IRS’s audit of our tax returns,

• the percentage of our total revenue from various market segments,

• our ability to integrate Sensima successfully and achieve the anticipated benefits from the acquisition,

• our ability to identify, acquire and integrate future acquisitions and achieve the anticipated benefits from such acquisitions,

• our intention and ability to continue our stock repurchase program and pay future cash dividends, and

• the factors that differentiate us from our competitors.

In some cases, words such as “would,” “could,” “may,” “should,” “predict,” “potential,” “targets,” “continue,” “anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” “project,” “forecast,” “will,” the negative of these terms or other variations of such terms and similar expressions relating to the future identify forward-looking statements. All forward-looking statements are based on our current outlook, expectations, estimates, projections, beliefs and plans or objectives about our business and our industry. These statements are not guarantees of future performance and are subject to risks and uncertainties. Actual events or results could differ materially and adversely from those expressed in any such forward-looking statements. Risks and uncertainties that could cause actual results to differ materially include those set forth throughout this Annual Report on Form 10-K and, in particular, in the section entitled “Item 1A. Risk Factors”. Except as required by law, we disclaim any duty to and undertake no obligation to update any forward-looking statements, whether as a result of new information relating to existing conditions, future events or otherwise or to release publicly the results of any future revisions we may make to forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events. Readers are cautioned not to place undue reliance on such statements, which speak only as of the date of this Annual Report on Form 10-K. Readers should carefully review future reports and documents that we file from time to time with the Securities and Exchange Commission, such as our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and any Current Reports on Form 8-K

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PART I

ITEM 1.    BUSINESS

General

Monolithic Power Systems (“MPS”) is a leading company in high performance power solutions. Founded in 1997, MPS pioneered integrated power semiconductor solutions and power delivery architectures. MPS's mission is to provide innovative power solutions in cloud computing, telecommunications, industrial and automotive, and consumer market segments. MPS has over 1,000 employees worldwide, located in the United States, China, Taiwan, Korea, Japan and across Europe.

Industry Overview

Semiconductors comprise the basic building blocks of electronic systems and equipment. Within the semiconductor industry, components can be classified either as discrete devices, such as individual transistors, or as ICs, in which a number of transistors and other elements are combined to form a more complicated electronic circuit. ICs can be further divided into three primary categories: digital, analog, and mixed-signal. Digital ICs, such as memory devices and microprocessors, can store or perform arithmetic functions on data that is represented by a series of ones and zeroes. Analog ICs, in contrast, handle real world signals such as temperature, pressure, light, sound, or speed. In addition, analog ICs also perform power management functions, such as regulating or converting voltages, for electronic devices. Mixed-signal ICs combine digital and analog functions onto a single chip and play an important role in bridging real world phenomena to digital systems.

Analog and Mixed-Signal Markets.  We focus on the market for ‘high performance’ analog and mixed-signal ICs. ‘High performance’ products generally are differentiated by functionality and performance factors which include integration of higher levels of functionality onto a single chip, greater precision, higher speed and lower heat and noise. There are several key factors that distinguish analog and mixed-signal IC markets, and in particular the high performance portion of the analog and mixed signal IC market, from digital IC markets. These factors include longer product life cycles, numerous market segments, technology that is difficult to replicate, relative complexity of design and process technology, importance of experienced design engineers, lower capital requirements and diversity of end markets.  We have, however, targeted product and market areas that we believe have the ability to offer above average industry growth over the long term.

Acquisition

In July 2014, we completed the acquisition of Sensima Technology SA (“Sensima”), a company based in Switzerland that develops magnetic sensors for angle measurement as well as three-dimensional magnetic field sensing. Sensima’s products are based on Hall devices that are directly integrated with the signal treatment and instantaneously detect and deliver the angle value in digital format. Their angle sensors are used in rotary encoders, electronically commutated motors and a broad range of products. By combining Sensima’s real time precision magnetic angle sensing with our technologies, we expect to create new opportunities with customers by offering enhanced solutions in power management for key industries such as automotive, industrial and cloud computing.

For a detailed discussion of the terms of the acquisition, please refer to Note 2 to our consolidated financial statements under Item 8 of this Annual Report on Form 10-K.

 Products and Applications

We currently have two primary product families that address multiple applications within the storage and computing, consumer electronics, communications, and industrial/automotive markets. Our products are differentiated with respect to their high degree of integration and strong levels of accuracy and efficiency, making them cost-effective relative to many competing solutions. These product families include:

Direct Current (DC) to DC Products. DC to DC ICs are used to convert and control voltages within a broad range of electronic systems, such as portable electronic devices, wireless LAN access points, computers, set top boxes, TVs and monitors, automobiles and medical equipment. We believe that our DC to DC products are differentiated in the market, particularly with respect to their high degree of integration, high voltage operation, high load current, high switching speed and small footprint. These features are important to our customers as they result in fewer components, a smaller form factor, more accurate regulation of voltages, and, ultimately, lower system cost and increased reliability through the elimination of many discrete components and power devices. The DC to DC product family accounted for 90%, 89% and 88% of our total revenue in 2014, 2013 and 2012, respectively.  

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Lighting Control Products and AC/DC Offline Solutions.  Lighting control ICs are used in backlighting and general illumination products. Lighting control ICs for backlighting are used in systems that provide the light source for LCD panels typically found in notebook computers, LCD monitors, car navigation systems, and LCD televisions. Backlighting solutions are typically either white light emitting diode (WLED) lighting sources or cold cathode fluorescent lamps (CCFL). WLED lighting control ICs step-up or step-down a DC voltage, or convert from an AC line voltage supplied by the utility company (also called AC/DC Offline) and provide efficient precision power and protection to a LED string or to multiple LED strings. The CCFL ICs function by converting low-voltage direct current (DC) or battery voltage to high-voltage alternating current (AC). We believe our CCFL ICs were the first to utilize a full bridge resonant topology that allows for high efficiency, extended lifetimes for CCFLs, and lower signal interference with adjacent components. The full bridge topology is now the industry standard for these products. The Lighting Control product family accounted for 10%, 11% and 12% of our total revenue in 2014, 2013 and 2012, respectively.

In addition to AC/DC offline solutions for lighting illumination applications, we also offer AC/DC power conversion solutions for a diverse number of end products that plug into a wall outlet. 

We currently target our products at the consumer electronics, communications, storage and computing, and industrial markets, with the consumer electronics market representing the largest portion of our revenue.

The following is a brief summary of our product family for various applications. For each of these applications, we are currently shipping products or have design wins, which are decisions by original equipment manufacturers (OEMs) or original design manufacturers (ODMs) to use our ICs:

Applications	WLED Lighting Illumination (non- backlight)	LCD Backlight (Inverters or WLED)	DC to DC Converters (Buck & Boost)	µP Reset & Supervisory	Audio Amplifiers	AC/DC Offline	Chargers (Switching & Linear)	Current Limit Switches
Storage and Computing
Computers		X	X	X	X	X	X	X
LCD Monitors		X	X	X	X	X
Disk Drives/ Storage Networks			X	X				X
Consumer Electronics
Set Top Boxes	X		X	X	X	X		X
Blu-Ray & DVD Players		X	X	X	X	X
Digital Still Cameras			X	X	X		X
Commercial & Industrial Bulb & CFL Replacement	X		X			X
GPS and Infotainment systems		X	X	X	X		X	X
Communications
Cellular Handsets	X		X		X	X	X
Networking Infrastructure			X	X		X
VOIP			X	X
Wireless Access Points			X	X			X
Industrial
Automotive	X	X	X	X	X			X
Industrial Applications		X	X	X		X	X	X

 We derive a majority of our revenue from our DC to DC IC product family sold to the consumer electronics, communications, storage and computing and industrial markets.  In the future, we will continue to introduce additional new products within our existing product families, such as high current, high voltage, small form factor switching voltage regulators, as well as expand our newer product families in battery chargers, voltage references and low dropout regulators. Our ability to achieve revenue growth will depend in part upon our ability to enter new market segments, gain market share, grow in regions outside of China, Taiwan and other Asian markets, expand our customer base and successfully secure manufacturing capacity.

For a detailed discussion of our revenue by product family, please refer to Note 16 to our consolidated financial statements under Item 8 of this Annual Report on Form 10-K.

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Customers, Sales and Marketing

We sell our products through third party distributors, value-added resellers and directly to OEMs, ODMs, and electronic manufacturing service (EMS) providers. Our third party distributors are subject to distribution agreements with us which allow the distributor to sell our products to end customers and other resellers.  Distributors may distribute our products to end customers which include OEMs, ODMs or EMS providers.  Our value-added resellers may second source our products and provide other services to customers. ODMs typically design and manufacture electronic products on behalf of OEMs, and EMS providers typically provide manufacturing services for OEMs and other electronic product suppliers.  

Sales to our largest distributor accounted for approximately 26% of revenue in 2014, 32% of revenue in 2013 and 32% of revenue in 2012. In addition, one other distributor accounted for 10% of revenue in 2013. No other customers accounted for more than 10% of revenue in any periods presented.

Current distribution agreements with several of our major distributors provide that each distributor shall have the non-exclusive right to sell and use its best efforts to promote and develop a market for our products. These agreements provide that payment for purchases from us will generally occur within 30 to 45 days from the date of invoice.  In addition, we allow for limited stock rotation in certain agreements.

We have sales offices located in the United States, Taiwan, China, Korea and Japan and have marketing representatives in Europe and Singapore. Our products typically require a highly technical sales and applications engineering effort where we assist our customers in the design and use of our products in their application.  We maintain a staff of applications engineers who work directly with our customers’ engineers in the development of their systems’ electronics containing our products.

Because our sales are billed and payable in United States dollars, our sales are not directly subject to fluctuating currency exchange rates. However, because a majority of our revenue is attributable to direct or indirect sales to customers in Asia, changes in the relative value of the dollar may create pricing pressures for our products. For the years ended December 31, 2014, 2013 and 2012, approximately 91%, 90% and 89% of our revenue was from customers in Asia, respectively.

Our sales are made primarily pursuant to standard individual purchase orders. Our backlog consists of orders that we have received from customers which have not yet shipped. Our manufacturing lead times are generally 4 to 12 weeks and we often build inventory in advance of customer orders based on our forecast of future customer orders. This subjects us to certain risks, most notably the possibility that sales will not meet our forecast, which could lead to inventories in excess of demand. If excess inventory exists, it may be necessary for us to sell it at a substantial discount, take a significant write-down or dispose of it altogether, either of which would negatively affect our profit margins.

We operate in the cyclical semiconductor industry where there is seasonal demand for certain of our products. While we are not and will not be immune from current and future industry downturns, we have targeted product and market areas that we believe have the ability to offer above average industry performance over the long term.

Research and Development

We have assembled a qualified team of engineers in the United States and China with core competencies in analog and mixed-signal design. Through our research and development efforts, we have developed a collection of intellectual property and know-how that we are able to leverage across our products and markets. These include the development of high efficiency power devices, the design of precision analog circuits, expertise in mixed-signal integration and the development of proprietary semiconductor process technologies.

Our research and development efforts are generally targeted at three areas: systems architecture, circuit design and implementation, and process technology. In the area of systems architecture, we are exploring new ways of solving our customers’ system design challenges and are investing in the development of systems expertise in new markets and applications that align well with our core capabilities. In the area of circuit design and implementation, our initiatives include expanding our portfolio of products and adding new features to our products. In the area of process technology, we are investing research and development resources to provide leading-edge analog power processes for our next generation of integrated circuits. Process technology is a key strategic component to our future growth. 

Our research and development expenses totaled $58.6 million, $49.7 million and $48.8 million for the years ended December 31, 2014, 2013 and 2012, respectively. 

Patents and Intellectual Property Matters

We rely on our proprietary technologies, which include both our proprietary circuit designs for our products and our proprietary manufacturing process technologies. Our future success and competitive position depend in part upon our ability to obtain and maintain protection of our proprietary technologies.

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In general, we have elected to pursue patent protection for aspects of our circuit and device designs that we believe are patentable and to protect our manufacturing process technologies by maintaining those process technologies as trade secrets. As of December 31, 2014, we had approximately 1,172 patents/applications issued or pending, of which 223 patents have been issued in the United States. Our issued patents are scheduled to expire at various times through December 2034.Our patents are material to our business, but we do not rely on any one particular patent for our success. We also rely on a combination of nondisclosure agreements and other contractual provisions, as well as our employees’ commitment to confidentiality and loyalty, to protect our technology, know-how, and processes. We also seek to register certain of our trademarks as we deem appropriate. We have not registered any of our copyrights and do not believe registration of copyrights is material to our business. Despite precautions that we take, it may be possible for unauthorized third parties to copy aspects of our current or future technology or products or to obtain and use information that we regard as proprietary. There can be no assurance that the steps we take will be adequate to protect our proprietary rights, that our patent applications will lead to issued patents, that others will not develop or patent similar or superior products or technologies, or that our patents will not be challenged, invalidated, or circumvented by others. Furthermore, the laws of the countries in which our products are or may be developed, manufactured or sold may not protect our products and intellectual property rights to the same extent as laws in the United States. Our failure to adequately protect our proprietary technologies could materially harm our business.

The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other intellectual property rights. For a more complete description of our legal matters, please read Note 13 to our consolidated financial statements. Patent infringement is an ongoing risk, in part because other companies in our industry could have patent rights that may not be identifiable when we initiate development efforts. Litigation may be necessary to enforce our intellectual property rights, and we may have to defend ourselves against infringement claims. Any such litigation could be very costly and may divert our management resources. Further, we have agreed to indemnify certain of our customers and suppliers in some circumstances against liability from infringement by our products. In the event any third party were to make an infringement claim against us or our customers, we could be enjoined from selling selected products or could be required to indemnify our customers or suppliers or pay royalties or other damages to third parties. If any of our products is found to infringe and we are unable to obtain necessary licenses or other rights on acceptable terms, we would either have to change our product so that it does not infringe or stop making the infringing product, which could have a material adverse effect on our operating results, financial condition and cash flows.

Manufacturing

We utilize a fabless business model, working with third parties to manufacture and assemble our integrated circuits. This fabless approach allows us to focus our engineering and design resources on our strengths and to reduce our fixed costs and capital expenditures. In contrast to many fabless semiconductor companies, who utilize standard process technologies and design rules established by their foundry partners, we have developed our own proprietary process technology and collaborate with our foundry partners to install our technology on their equipment in their facilities for use solely on our behalf. This close collaboration and control over the manufacturing process has historically resulted in favorable yields and product performance for our integrated circuits.

We currently contract with three suppliers to manufacture our wafers in foundries located in China. Once our silicon wafers have been produced, they are shipped to our facility in Chengdu, China for wafer sort. Our semiconductor products are then assembled and packaged by independent subcontractors in China and Malaysia. The assembled ICs are then sent for final testing primarily at our Chengdu facility prior to shipping to our customers.

In September 2004, we entered into a lease arrangement for our manufacturing facility located in Chengdu, China. We have the option to acquire the facility for approximately $1.6 million which consists of total construction costs minus total rent paid by us during the lease term. This option became exercisable in March 2011. We may exercise our purchase option and enter into a purchase agreement for this facility in the future. The facility has been fully operational since 2006 and we have benefitted from shorter manufacturing cycle times and lower labor and overhead costs. We have expanded our product testing capabilities in our China facility and are able to take advantage of the rich pool of local engineering talent to expand our manufacturing support and engineering operations.

In addition, we constructed a 150,000 square-foot research and development facility in Chengdu, China which was put into operation in October 2010.

Key Personnel and Employees

Our performance is substantially dependent on the performance of our executive officers and key employees. Due to the relative complexity of the design of our analog and mixed-signal ICs, our engineers generally have more years of experience and greater circuit design aptitude than the more prevalent digital circuit design engineer. Analog engineers with advanced skills are limited in number and difficult to replace. The loss of the services of key officers, managers, engineers and other technical personnel would materially harm our business. Our future success will depend, in part, on our ability to attract, train, retain, and motivate highly qualified technical and managerial personnel.  We may not be successful in attracting and retaining such personnel. Our employees are not represented by a collective bargaining organization, and we have never experienced a work stoppage or strike. Our management considers employee relations to be good. As of December 31, 2014, we employed 1,178 employees located in the United States, Taiwan, China, Japan, Korea, Europe and Singapore.

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Competition

The analog and mixed-signal semiconductor industry is highly competitive, and we expect competitive pressures to continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit both applications engineering and design engineering personnel, our ability to introduce new products, and our ability to maintain the rate at which we introduce these new products. Our industry is characterized by decreasing unit selling prices over the life of a product. We compete with domestic and international semiconductor companies, many of which have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and distribution of their products. We are in direct and active competition, with respect to one or more of our product lines, with at least 10 manufacturers of such products, of varying size and financial strength. The number of our competitors has grown due to expansion of the market segments in which we participate. We consider our primary competitors to include Analog Devices, Fairchild Semiconductor, International Rectifier, Intersil Corporation, Linear Technology, Maxim Integrated Products, Micrel Inc., Microchip Technology, Microsemi Corporation, O2 Micro International, ON Semiconductor, Power Integrations, Inc., Richtek Technology Corporation, Rohm Co., Ltd., Semtech Corporation, STMicroelectronics N.V., and Texas Instruments Incorporated.

We expect continued competition from existing competitors as well as competition from new entrants into the semiconductor market. We believe that we are competitive in the markets in which we sell, particularly because our ICs typically are smaller in size, are highly integrated, possess higher levels of power management functionalities and achieve high performance specifications at lower price points than most of our competition. However, we cannot assure you that our products will continue to compete favorably or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering this market.

Geographical and Segment Information

Please refer to the geographical and segment information for each of the last three fiscal years in Note 16 to our consolidated financial statements.

Please refer to the discussion of risks related to our foreign operations in the section entitled “Item 1A: Risk Factors.”

Available Information

We were incorporated in California in 1997 and reincorporated in Delaware in November 2004. Our executive offices are located at 79 Great Oaks Boulevard, San Jose CA 95119. Our telephone number is (408) 826-0600. Our e-mail address is investors@monolithicpower.com, and our website is www.monolithicpower.com. Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, current reports on Form 8-K, and amendments to those filed or furnished pursuant to Sections 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge. They may be obtained from our website as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission, or at the SEC website at www.sec.gov. Information contained on our website is not a part of this Annual Report on Form 10-K.

Executive Officers of the Registrant

Information regarding our executive officers as of February 28, 2015 is as follows:

Name	Age	Position
Michael R. Hsing	55	President, CEO and Director
Meera P. Rao	54	CFO and Principal Financial and Accounting Officer
Deming Xiao	52	President of Asia Operations
Maurice Sciammas	55	Senior Vice President of Worldwide Sales and Marketing
Saria Tseng	44	Vice President, Strategic Corporate Development, General Counsel and Corporate Secretary

Michael R. Hsing has served on our board of directors and has served as our President and Chief Executive Officer since founding MPS in August 1997. Before founding MPS, Mr. Hsing held senior technical positions at companies such as Supertex, Inc. and Micrel, Inc. Mr. Hsing is an inventor on numerous patents related to the process development of bipolar mixed-signal semiconductor manufacturing. Mr. Hsing holds a B.S.E.E. from the University of Florida.

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Meera P. Rao has served as our Chief Financial Officer since January 2011. Ms. Rao joined us in January 2009 and served as our Vice President of Finance and Corporate Controller. Prior to joining MPS, she was the principal in her own consulting practice, working with various semiconductor companies, including MPS, where she set up our business operations in Chengdu, China in 2006.  Ms. Rao has more than 20 years of experience with semiconductor and high technology companies and has held various senior executive positions, including CFO of Integration Associates, Vice President of Finance and Interim CFO at Atrica, Vice President of Finance at Raza Foundries, Corporate Controller and Interim CFO at nVIDIA, as well as various positions at Advanced Micro Devices.  Ms. Rao is a CPA and holds an MBA from the University of Rochester.

Maurice Sciammas has served as our Senior Vice President of Worldwide Sales and Marketing since 2007. Mr. Sciammas joined MPS in July 1999 and served as Vice President of Products and Vice President of Sales (excluding greater China) until he was appointed to his current position.  Before joining MPS, he was Director of IC Products at Supertex from 1990 to 1999. He has also held positions at Micrel, Inc. He holds a B.S.E.E. degree from San Jose State University.

Deming Xiao has served as our President of Asia Operations since January 2008. Since joining us in May 2001, Mr. Xiao has held several executive positions, including Foundry Manager and Senior Vice President of Operations. Before joining us, from June 2000 to May 2001, Mr. Xiao was Engineering Account Manager at Chartered Semiconductor Manufacturing, Inc. Prior to that, Mr. Xiao spent six years as the Manager of Process Integration Engineering at Fairchild Imaging Sensors. Mr. Xiao holds a B.S. in Semiconductor Physics from Sichuan University, Chengdu, China and an M.S.E.E. from Wayne State University.

Saria Tseng has served as our Vice President, General Counsel and Corporate Secretary since 2004 and additionally as our Vice President, Strategic Corporate Development since 2009. Ms. Tseng joined MPS from MaXXan Systems, Inc. where she was Vice President and General Counsel from 2001 to 2004. Previously, Ms. Tseng was an attorney at Gray Cary Ware & Freidenrich, LLP and Jones, Day, Reavis & Pogue.  Ms. Tseng is a member of the state bar in both California and New York and is a member of the bar association of the Republic of China (Taiwan). She holds Masters of Law degrees from the University of California at Berkeley and the Chinese Culture University in Taipei.    

 ITEM 1A.  RISK FACTORS

Our business involves risks and uncertainties. You should carefully consider the risks described below, together with all of the other information in this Annual Report on Form 10-K and other filings with the Securities and Exchange Commission in evaluating our business.  If any of the following risks actually occur, our business, financial condition, operating results, and growth prospects would likely be materially and adversely affected.  In such an event, the trading price of our common stock could decline, and you could lose all or part of your investment in our common stock. Our past financial performance should not be considered to be a reliable indicator of future performance, and investors should not use historical trends to anticipate results or trends in future periods.  These risks involve forward-looking statements and our actual results may differ substantially from those discussed in these forward-looking statements.

The future trading price of our common stock could be subject to wide fluctuations in response to a variety of factors.

The future trading price of our common stock is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, many of which are beyond our control, including:

• our results of operations and financial performance;

• general economic, industry and market conditions worldwide;

• our ability to outperform the market, and outperform at a level that meets or exceeds our investors’ expectations;

• whether our forward guidance meets the expectations of our investors;

• the depth and liquidity of the market for our common stock;

• developments generally affecting the semiconductor industry;

• commencement of or developments relating to our involvement in litigation;

• investor perceptions of us and our business strategies;

• changes in securities analysts’ expectations or our failure to meet those expectations;

• actions by institutional or other large stockholders;

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• terrorist acts or acts of war;

• actual or anticipated fluctuations in our results of operations;

• actual or anticipated manufacturing capacity limitations;

• developments with respect to intellectual property rights;

• introduction of new products by us or our competitors;

• our sale of common stock or other securities in the future;

• conditions and trends in technology industries;

• our loss of key customers;

• changes in market valuation or earnings of our competitors;

• any mergers, acquisitions or divestitures of assets undertaken by us;

• government debt default;

• our ability to develop new products, enter new market segments, gain market share, manage litigation risk, diversify our customer base and successfully secure manufacturing capacity;

• •	our ability to increase our gross margins; market reactions to guidance from other semiconductor companies or third-party research groups;
•	our ability to continue the stock repurchase program and pay quarterly cash dividends to stockholders; and

• changes in the estimation of the future size and growth rate of our markets.

In addition, the stock market often experiences substantial volatility that is seemingly unrelated to the operating performance of particular companies. These broad market fluctuations may adversely affect the trading price of our common stock.

We expect our operating results to fluctuate from quarter to quarter and year to year, which may make it difficult to predict our future performance and could cause our stock price to decline and be volatile.

Our revenue, expenses, and results of operations are difficult to predict, have varied significantly in the past and will continue to fluctuate significantly in the future due to a number of factors, many of which are beyond our control. We expect fluctuations to continue for a number of reasons, including:

• changes in general demand for electronic products as a result of worldwide macro-economic conditions;

• changes in business conditions at our distributors, value-added resellers and/or end-customers;

• changes in general economic conditions in the countries where our products are sold or used;

• the timing of developments and related expenses in our litigation matters;

• the loss of key customers or our inability to attract new customers due to customer and prospective customer concerns about being litigation targets;

• continued dependence on turns business (orders received and shipped within the same fiscal quarter);

• continued dependence on the Asian markets for our customer base;

• increases in assembly costs due to commodity price increases, such as the price of gold;

• the timing of new product introductions by us and our competitors;

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• changes in our revenue mix between OEMs, ODMs, distributors and value-added resellers;

• changes in product mix, product returns, and actual and potential product liability;

• the acceptance of our new products in the marketplace;

• our ability to develop new process technologies and achieve volume production;

• our ability to meet customer product demand in a timely manner;

• the scheduling, rescheduling, or cancellation of orders by our customers;

• the cyclical nature of demand for our customers’ products;

• fluctuations in our estimate for stock rotation reserves;

• our ability to manage our inventory levels, including the levels of inventory held by our distributors;

• inventory levels and product obsolescence;

• seasonality and variability in the storage and computing, consumer electronics, and communications markets;

• the availability of adequate manufacturing capacity from our outside suppliers;

• increases in prices for finished wafers due to general capacity shortages;

• the potential loss of future business resulting from capacity issues;

• changes in manufacturing yields;

• movements in exchange rates, interest rates or tax rates; and

• accounting charges resulting from equity awards granted to our employees.

Due to the factors noted above and other risks described in this section, many of which are beyond our control, you should not rely on quarter-to-quarter or year-over-year comparisons to predict our future financial performance. Unfavorable changes in any of the above factors may seriously harm our business and results of operations, and may cause our stock price to decline and be volatile.

Our business has been and may continue to be significantly impacted by worldwide economic conditions and uncertainty in the outlook for the global economy makes it more likely that our actual results will differ materially from expectations.

In recent years, global credit and financial markets experienced disruptions, and may continue to experience disruptions in the future, including diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates, and continued uncertainty about economic stability. These economic uncertainties affect businesses such as ours in a number of ways, making it difficult to accurately forecast and plan our future business activities. The continued or further tightening of credit in financial markets may lead consumers and businesses to postpone spending, which may cause our customers to cancel, decrease or delay their existing and future orders with us. In addition, financial difficulties experienced by our suppliers or distributors could result in product delays, increased accounts receivable defaults and inventory challenges. Volatility in the credit markets could severely diminish liquidity and capital availability. Demand for consumer electronics is a function of the health of the economies in the United States, Europe, China and the rest of the world. We cannot predict the timing, strength or duration of any economic disruption or subsequent economic recovery, worldwide, in the United States, in our industry, or in the consumer electronics market. These and other economic factors have had and may continue to have a material adverse effect on demand for our products and on our financial condition and operating results.

We may not be profitable on a quarterly or annual basis.

Our profitability is dependent on many factors, including:

• our sales, which because of our turns business (i.e., orders received and shipped within the same fiscal quarter), are difficult to accurately forecast;

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• the cancellation or rescheduling of our customers’ orders, which may occur without significant penalty to our customers;

• changes in general demand for electronic products as a result of worldwide macro-economic conditions;

• changes in revenue mix between OEMs, ODMs, distributors and value-added resellers;

• changes in product mix and actual and potential product liability;

• changes in revenue mix between end market segments (i.e. communication, storage and computing, consumer and industrial);

• our competition, which could adversely impact our selling prices and our potential sales;

• our manufacturing costs, including our ability to negotiate with our vendors and our ability to efficiently run our test facility in China;

• manufacturing capacity constraints;

• settlements of tax audits;

• stock-based compensation accounting charges; and

• our operating expenses, including general and administrative expenses, selling and marketing expenses, and research and development expenses relating to products that will not be introduced and will not generate revenue until later periods, if at all.

We may not achieve profitability on a quarterly or annual basis in the future. Unfavorable changes in our operations, including any of the factors noted above, may have a material adverse effect on our quarterly or annual profitability.

We may not experience growth rates comparable to past years.

In the past, our revenue increased significantly in certain years due to increased sales of certain of our products. Due to various factors, including increased competition, loss of certain of our customers, unfavorable changes in our operations, reduced global electronics demand, end-customer market downturn, market acceptance and penetration of our current and future products and ongoing litigation, we may not experience growth rates comparable to past periods, which could materially and adversely affect our stock price and results of operations.

We may be unsuccessful in developing and selling new products with margins similar to or better than what we have experienced in the past, which would impact our overall gross margin and financial performance.

Our success depends on products that are differentiated in the market, which result in gross margins that have historically been above industry averages. Should we fail to improve our gross margin in the future, and accordingly develop and introduce sufficiently differentiated products that result in higher gross margins than industry averages, our financial condition and results of operations could be materially and adversely affected. 

The highly cyclical nature of the semiconductor industry, which has produced significant and sometimes prolonged downturns, could materially adversely affect our operating results, financial condition and cash flows.

Historically, the semiconductor industry has been highly cyclical and, at various times, has experienced significant downturns and wide fluctuations in supply and demand. These conditions have caused significant variances in product demand and production capacity, as well as rapid erosion of average selling prices. The industry may experience severe or prolonged downturns in the future, which could result in downward pressure on the price of our products as well as lower demand for our products. Because significant portions of our expenses are fixed in the short term or incurred in advance of anticipated sales, we may not be able to decrease our expenses in a timely manner to offset any sales shortfall. These conditions could have a material adverse effect on our operating results, financial condition and cash flows.

If demand for our products declines in the major end markets that we serve, our revenue will decrease and our results of operations and financial condition would be materially and adversely affected.

We believe that the application of our products in the storage and computer, consumer electronics, communications and industrial markets will continue to account for the majority of our revenue. If the demand for our products declines in the major end markets that we serve, our revenue will decrease and our results of operations and financial condition would be materially and adversely affected. In addition, as technology evolves, the ability to integrate the functionalities of various components, including our discrete semiconductor products, onto a single chip and/or onto other components of systems containing our products increases. Should our customers require integrated solutions that we do not offer, demand for our products could decrease, and our business and results of operations would be materially and adversely affected.

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We may be unsuccessful in developing and selling new products or in penetrating new markets required to maintain or expand our business.

Our competitiveness and future success depend on our ability to design, develop, manufacture, assemble, test, market, and support new products and enhancements on a timely and cost-effective basis. A fundamental shift in technologies in any of our product markets could have a material adverse effect on our competitive position within these markets. Our failure to timely develop new technologies or to react quickly to changes in existing technologies could materially delay our development of new products, which could result in product obsolescence, decreased revenue, and/or a loss of market share to competitors.

As we develop new product lines, we must adapt to market conditions that are unfamiliar to us, such as competitors and distribution channels that are different from those we have known in the past. Some of our new product lines require us to re-equip our labs to test parameters we have not tested in the past. If we are unable to adapt rapidly to these new and additional conditions, we may not be able to successfully penetrate new markets.

The success of a new product depends on accurate forecasts of long-term market demand and future technological developments, as well as on a variety of specific implementation factors, including:

• timely and efficient completion of process design and device structure improvements;

• timely and efficient implementation of manufacturing, assembly, and test processes;

• the ability to secure and effectively utilize fabrication capacity in different geometries;

• product performance;

• product availability;

• product quality and reliability; and

• effective marketing, sales and service.

To the extent that we fail to timely introduce new products or to quickly penetrate new markets, our revenue and financial condition could be materially adversely affected.

We derive most of our revenue from direct or indirect sales to customers in Asia and have significant operations in Asia, which may expose us to political, cultural, regulatory, economic, foreign exchange, and operational risks.

We derive most of our revenue from customers located in Asia through direct sales or indirect sales through distribution arrangements and value-added reseller agreements with parties located in Asia. As a result, we are subject to increased risks due to this geographic concentration of business and operations. For the year ended December 31, 2014, approximately 91% of our revenue was from customers in Asia. There are risks inherent in doing business in Asia, and internationally in general, including:

• changes in, or impositions of, legislative or regulatory requirements, including tax laws in the United States and in the countries in which we manufacture or sell our products;

• trade restrictions, including restrictions imposed by the United States on trading with parties in foreign countries;

• currency exchange rate fluctuations impacting intra-company transactions;

• transportation delays;

• changes in tax regulations in China that may impact our tax status in Chengdu;

• multi-tiered distribution channels that lack visibility to end customer pricing and purchase patterns;

• international political relationships and threats of war;

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• terrorism and threats of terrorism;

• epidemics and illnesses;

• work stoppages and infrastructure problems due to adverse weather conditions or natural disasters;

• work stoppages related to employee dissatisfaction;

• economic, social and political instability;

• changes in import/export regulations, tariffs, and freight rates;

• longer accounts receivable collection cycles and difficulties in collecting accounts receivables;

• enforcing contracts generally; and

• less effective protection of intellectual property and contractual arrangements.

If we fail to expand our customer base and significantly reduce the geographic concentration of our customers, we will continue to be subject to the foregoing risks, which could materially and adversely affect our revenue and financial condition.

We depend on a limited number of customers for a significant percentage of our revenue.

Historically, we have generated most of our revenue from a limited number of customers. For example, sales to our largest distributor accounted for approximately 26% of our total revenue for the year ended December 31, 2014. We continue to rely on a limited number of customers for a significant portion of our revenue. Because we rely on a limited number of customers for significant percentages of our revenue, a decrease in demand for our products from any of our major customers for any reason (including due to market conditions, catastrophic events or otherwise) could have a materially adverse impact on our financial conditions and results of operations.

We are subject to anti-corruption laws in the jurisdictions in which we operate, including the U.S. Foreign Corrupt Practices Act, or the FCPA. Our failure to comply with these laws could result in penalties which could harm our reputation and have a material adverse effect on our business, results of operations and financial condition.

 We are subject to the FCPA, which generally prohibits companies and their intermediaries from making improper payments to foreign officials for the purpose of obtaining or keeping business and/or other benefits, along with various other anti-corruption laws. Although we have implemented policies and procedures designed to ensure that we, our employees and other intermediaries comply with the FCPA and other anti-corruption laws to which we are subject, there is no assurance that such policies or procedures will work effectively all of the time or protect us against liability under the FCPA or other laws for actions taken by our employees and other intermediaries with respect to our business or any businesses that we may acquire. We have significant operations in Asia, which places us in frequent contact with persons who may be considered “foreign officials” under the FCPA, resulting in an elevated risk of potential FCPA violations. If we are not in compliance with the FCPA and other laws governing the conduct of business with government entities (including local laws), we may be subject to criminal and civil penalties and other remedial measures, which could have an adverse impact on our business, financial condition, results of operations and liquidity. Any investigation of any potential violations of the FCPA or other anti-corruption laws by U.S. or foreign authorities could harm our reputation and have an adverse impact on our business, financial condition and results of operations.

We receive a significant portion of our revenue from distribution arrangements, value-added resellers and direct customers, and the loss of any one of these distributors, value-added resellers or direct customers or failure to collect a receivable from them could adversely affect our operations and financial position.

We market our products through distribution arrangements and value-added resellers and through our direct sales and applications support organization to customers that include OEMs, ODMs and EMSs. Receivables from our customers are generally not secured by any type of collateral and are subject to the risk of being uncollectible. Sales to our largest distributor accounted for approximately 26% of our total revenue for the year ended December 31, 2014. Significant deterioration in the liquidity or financial condition of any of our major customers or any group of our customers could have a material adverse impact on the collectability of our accounts receivable and our future operating results. We primarily conduct our sales on a purchase order basis, and we do not have any long-term supply commitments.

Moreover, we believe a high percentage of our products are eventually sold to a number of OEMs. Although we communicate with OEMs in an attempt to achieve “design wins,” which are decisions by OEMs and/or ODMs to incorporate our products, we do not have purchase commitments from these end users. Therefore, there can be no assurance that the OEMs and/or ODMs will continue to incorporate our ICs into their products. OEM technical specifications and requirements can change rapidly, and we may not have products that fit new specifications from an end-customer for whom we have had previous design wins. We cannot be certain that we will continue to achieve design wins from large OEMs, that our direct customers will continue to be successful in selling to the OEMs, or that the OEMs will be successful in selling products which incorporate our ICs. The loss of any significant customer, any material reduction in orders by any of our significant customers or by their OEM customers, the cancellation of a significant customer order, or the cancellation or delay of a customer’s or OEM’s significant program or product could reduce our revenue and adversely affect our results of operations and financial condition. 

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Due to the nature of our business as a component supplier, we may have difficulty both in accurately predicting our future revenue and appropriately managing our expenses.

Because we provide components for end products and systems, demand for our products is influenced by our customers’ end product demand. As a result, we may have difficulty in accurately forecasting our revenue and expenses. Our revenue depends on the timing, size, and speed of commercial introductions of end products and systems that incorporate our products, all of which are inherently difficult to forecast, as well as the ongoing demand for previously introduced end products and systems. In addition, demand for our products is influenced by our customers’ ability to manage their inventory. Our sales to distributors are subject to higher volatility because they service demand from multiple levels of the supply chain which, in itself, is inherently difficult to forecast. If our customers, including distributors, do not manage their inventory correctly or misjudge their customers’ demand, our shipments to and orders from our customers may vary significantly on a quarterly basis.

Our ability to increase product sales and revenue may be constrained by the manufacturing capacity of our suppliers.

Although we provide our suppliers with rolling forecasts of our production requirements, their ability to provide wafers to us is limited by the available capacity, particularly capacity in the geometries we require, at the facilities in which they manufacture wafers for us.  As a result, this lack of capacity has at times constrained our product sales and revenue growth.  In addition, an increased need for capacity to meet internal demands or demands of other customers could cause our suppliers to reduce capacity available to us. Our suppliers may also require us to pay amounts in excess of contracted or anticipated amounts for wafer deliveries or require us to make other concessions in order to acquire the wafer supply necessary to meet our customer requirements. If our suppliers extend lead times, limit supplies or the types of capacity we require, or increase prices due to capacity constraints or other factors, our revenue and gross margin may materially decline.  In addition, if we experience supply delays or limitations, our customers may reduce their purchase levels with us and/or seek alternative solutions to meet their demand, which could materially and adversely impact our business and results of operations.

We currently depend on third-party suppliers to provide us with wafers for our products. If any of our wafer suppliers become insolvent or capacity constrained and are unable and/or fail to provide us sufficient wafers at acceptable yields and at anticipated costs, our revenue and gross margin may decline or we may not be able to fulfill our customer orders.

We have a supply arrangement with certain suppliers for the production of wafers. Should any of our suppliers become insolvent or capacity constrained, we may not be able to fulfill our customer orders, which would likely cause a decline in our revenue.

While certain aspects of our relationship with these suppliers are contractual, many important aspects of this relationship depend on our suppliers’ continued cooperation and our management of relationships. In addition, the fabrication of ICs is a highly complex and precise process. Problems in the fabrication process can cause a substantial percentage of wafers to be rejected or numerous ICs on each wafer to be non-functional. This could potentially reduce yields. The failure of our suppliers to supply us wafers at acceptable yields could prevent us from fulfilling our customer orders for our products and would likely cause a decline in our revenue.  

Further, as is common in the semiconductor industry, our customers may reschedule or cancel orders on relatively short notice. If our customers cancel orders after we submit a committed forecast to our suppliers for the corresponding wafers, we may be required to purchase wafers that we may not be able to resell, which would adversely affect our operating results, financial condition, and cash flows.

We might not be able to deliver our products on a timely basis if our relationships with our assembly and test subcontractors are disrupted or terminated.

We do not have direct control over product delivery schedules or product quality because all of our products are assembled by third-party subcontractors and a portion of our testing is currently performed by third-party subcontractors. Also, due to the amount of time typically required to qualify assembly and test subcontractors, we could experience delays in the shipment of our products if we were forced to find alternate third parties to assemble or test our products.  In addition, events such as the recent global economic crisis may materially impact our assembly suppliers’ ability to operate. Any future product delivery delays or disruptions in our relationships with our subcontractors could have a material adverse effect on our operating results, financial condition, and cash flows. 

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There may be unanticipated costs associated with adding to or supplementing our third-party suppliers’ manufacturing capacity.

We anticipate that future growth of our business will require increased manufacturing capacity on the part of third-party supply foundries, assembly shops, and testing facilities for our products.  In order to facilitate such growth, we may need to enter into strategic transactions, investments and other activities. Such activities are subject to a number of risks, including:

• the costs and expense associated with such activities;

• the availability of modern foundries to be developed, acquired, leased or otherwise made available to us or our third-party suppliers;

• the ability of foundries and our third-party suppliers to obtain the advanced equipment used in the production of our products;

• delays in bringing new foundry operations online to meet increased product demand; and

• unforeseen environmental, engineering or manufacturing qualification problems relating to existing or new foundry facilities.

These and other risks may affect the ultimate cost and timing of any expansion of our third-party suppliers’ capacity.

We purchase inventory in advance based on expected demand for our products, and if demand is not as expected, we may have insufficient or excess inventory, which could adversely impact our financial position.

As a fabless semiconductor company, we purchase our inventory from third party manufacturers in advance of selling our product. We place orders with our manufacturers based on existing and expected orders from our customers for particular products. While most of our contracts with our customers and distributors include lead time requirements and cancellation penalties that are designed to protect us from misalignment between customer orders and inventory levels, we must nonetheless make some predictions when we place orders with our manufacturers. In the event that our predictions are inaccurate due to unexpected increases in orders or unavailability of product within the timeframe that is required, we may have insufficient inventory to meet our customer demands. In the event that we order products that we are unable to sell due to a decrease in orders, unexpected order cancellations, injunctions due to patent litigations, or product returns, we may have excess inventory which, if not sold, may need to be disposed of or would result in a decrease in our revenue in future periods as the excess inventory at our distributors is sold. If any of these situations were to arise, it could have a material impact on our business and financial position.

The outcome of currently ongoing and future examinations of our income tax returns by the IRS and foreign tax authorities could have a material adverse effect on our results of operations.

We are subject to examination of our income tax returns by the IRS and other tax authorities. Our U.S. Federal income tax returns for the years ended December 31, 2005 through December 31, 2007 are under examination by the IRS. In April 2011, we received from the IRS a Notice of Proposed Adjustment, or "NOPA", relating to a cost-sharing agreement entered into by us and our international subsidiaries on January 1, 2004. In the NOPA, the IRS objected to our allocation of certain litigation expenses between us and our international subsidiaries and the amount of "buy-in payments" made by our international subsidiaries to us in connection with the cost-sharing agreement, and proposed to increase our U.S. taxable income according to a few alternative methodologies. In February 2012, we received a revised NOPA from the IRS (Revised NOPA). In this Revised NOPA, the IRS raised the same issues as in the NOPA issued in April 2011 but under a different methodology. Under the Revised NOPA, the largest potential federal income tax payment, if the IRS were to prevail on all matters in dispute, is $10.5 million, plus interest and penalties, if any. We responded to the IRS Revised NOPA in May 2012. In June 2013, the IRS responded and continued to disagree with our rebuttal. We met with the IRS Office of Appeals in 2014, had additional discussions again in 2015, and both parties have been in continuous discussions for a resolution of the matter.  However, there is no guarantee these discussions will be conclusive. Meanwhile, we agreed to grant the IRS an extension of the statute of limitations for taxable years 2005 through 2007 to September 30, 2015. 

The IRS also audited the research and development credits carried forward into year 2005 and the credits generated in the years 2005 through 2007. We received a NOPA from the IRS in February 2011, proposing to reduce the research and development credits generated in years 2005 through 2007 and the carryforwards, which would then reduce the value of such credits carried forward to subsequent tax years.

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We have reviewed and responded to the above proposed adjustments. We regularly assess the likelihood of an adverse outcome resulting from such examinations to determine the adequacy of our provision for income taxes. Based on the technical merits of our tax return filing positions and the interactions to date with the IRS, we believe that it is more likely than not that the resolution of these audits will not have a material impact on our consolidated financial position and the results of operations and cash flows.

Changes in effective tax rates or adverse outcomes resulting from examination of our income tax returns could adversely affect our results.

Our future effective tax rates could be adversely affected by earnings being lower than anticipated in countries where we have lower statutory rates and higher than anticipated in countries where we have higher statutory rates, by changes in the valuation of our deferred tax assets and liabilities, or by changes in tax laws, regulations, accounting principles or interpretations thereof and discrete items such as future exercises or dispositions of stock options and restricted stock releases. In addition, we are subject to the continuous examination of our income tax returns by the IRS and other tax authorities. We regularly assess the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of our provision for income taxes. There can be no assurance that the outcomes from these continuous examinations will not have an adverse effect on our operating results and financial condition.

The complexity of calculating our tax provision may result in errors that could result in restatements of our financial statements.

Due to the complexity associated with the calculation of our tax provision, we have hired independent tax advisors to assist us in the calculation. If we or our independent tax advisors fail to resolve or fully understand certain issues that we may have had in the past and issues that may arise in the future, we could be subject to errors, which would result in us having to restate our financial statements. Restatements are generally costly and could adversely impact our results of operations and/or have a negative impact on the trading price of our common stock. 

If we are unsuccessful in legal proceedings brought against us or any of our customers, we could be prevented from selling many of our products and/or be required to pay substantial damages. An unfavorable outcome or an additional award of damages, attorneys’ fees or an injunction could cause our revenue to decline significantly and could severely harm our business and operating results.

From time to time we are party to various legal proceedings. If we are not successful in litigation that could be brought against us or our customers, we could be ordered to pay monetary fines and/or damages. If we are found liable for willful patent infringement, damages could be significant. We and/or our customers could also be prevented from selling some or all of our products. Moreover, our customers and end-users could decide not to use our products, and our products and our customers’ accounts payable to us could be seized. Finally, interim developments in these proceedings could increase the volatility in our stock price as the market assesses the impact of such developments on the likelihood that we will or will not ultimately prevail in these proceedings.

Given our inability to control the timing and nature of significant events in our legal proceedings that either have arisen or may arise, our legal expenses are difficult to forecast and may vary substantially from our publicly-disclosed forecasts with respect to any given quarter, which could contribute to increased volatility in our stock price and financial condition.

Historically, we have incurred significant expenses in connection with various legal proceedings that vary with the level of activity in the proceeding. It is difficult for us to forecast our legal expenses for any given quarter, which adversely affects our ability to forecast our expected results of operations in general. We may also be subject to unanticipated legal proceedings, which would result in our incurrence of unexpected legal expenses. If we fail to meet the expectations of securities or industry analysts as a result of unexpected changes in our legal expenses, our stock price could be impacted.

Future legal proceedings may divert our financial and management resources.

The semiconductor industry is characterized by frequent claims of infringement and litigation regarding patent and other intellectual property rights. Patent infringement is an ongoing risk, in part because other companies in our industry could have patent rights that may not be identifiable when we initiate development efforts. Litigation may be necessary to enforce our intellectual property rights, and we may have to defend ourselves against additional infringement claims. Such litigation is very costly. In the event any third party makes a new infringement claim against us or our customers, we could incur additional ongoing legal expenses. In addition, in connection with these legal proceedings, we may be required to post bonds to defend our intellectual property rights in certain countries for an indefinite period of time, until such dispute is resolved. If our legal expenses materially increase or exceed anticipated amounts, our capital resources and financial condition could be adversely affected. Further, if we are not successful in any of our intellectual property defenses, our financial condition could be adversely affected and our business could be harmed. In addition, our management team may also be required to devote a great deal of time, effort and energy to these legal proceedings, which could divert management’s attention from focusing on our operations and adversely affect our business.

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We will continue to vigorously defend and enforce our intellectual property rights around the world, especially as it relates to patent litigation.

From time to time, we are faced with having to defend our intellectual property rights throughout the world. Should we become engaged in such proceedings, it could divert management’s attention from focusing on and implementing our business strategy. Further, should we not be successful in any of our intellectual property enforcement actions, our revenue may be affected and our business could be harmed.

Failure to protect our proprietary technologies or maintain the right to certain technologies may negatively affect our ability to compete.

We rely heavily on our proprietary technologies. Our future success and competitive position depend in part upon our ability to obtain and maintain protection of certain proprietary technologies used in our products. We pursue patents for some of our new products and unique technologies, and we also rely on a combination of nondisclosure agreements and other contractual provisions, as well as our employees’ commitment to confidentiality and loyalty, to protect our technology, know-how, and processes. Despite the precautions we take, it may be possible for unauthorized third parties to copy aspects of our current or future technologies or products or to obtain and use information that we regard as proprietary. We intend to continue to protect our proprietary technologies, including through patents. However, there can be no assurance that the steps we take will be adequate to protect our proprietary rights, that our patent applications will lead to issued patents, that others will not develop or patent similar or superior products or technologies, or that our patents will not be challenged, invalidated, or circumvented by others. Furthermore, the laws of the countries in which our products are or may be developed, manufactured, or sold may not protect our products and intellectual property rights to the same extent as laws in the United States. Our failure to adequately protect our proprietary technologies would materially harm our business. 

The downgrade of the credit rating for U.S. long-term sovereign debt and that of certain Eurozone countries could affect global and domestic financial markets, which may affect our business, financial condition and liquidity.

Although a downgrade of long-term sovereign credit ratings is not unprecedented, a downgrade of the U.S. credit rating is, and the potential impact is uncertain. Management will continue to monitor the situation and there could be future changes in capital requirements or a rebalancing of investment portfolios in response to management’s assessment of the related risk weightings. At this time, however, U.S. treasuries continue to trade in active markets, and the yield curve on U.S. treasuries remains an appropriate basis for determining risk-free rates.

Should there be a deterioration of the global and financial markets as a result of the downgraded credit rating for U.S. long-term sovereign debt, and that of certain Eurozone countries, our business, financial condition and liquidity could be adversely affected.

The market for government-backed student loan auction-rate securities has suffered a decline in liquidity which may impact the liquidity and potential value of our investment portfolio.

The market for government-backed student loan auction-rate securities with interest rates that reset through a Dutch auction every 7 to 35 days became illiquid in 2008. We experienced our first failed auction in mid-February 2008. Since 2008, we have redeemed 87% of the original portfolio at par. At December 31, 2014, $5.6 million of our auction-rate security investments have failed to reset through successful auctions and it is unclear as to when these investments will regain their liquidity. The underlying maturity of these auction-rate securities is up to 33 years. 

We recorded temporary and other-than-temporary impairment charges on these investments. The valuation is subject to fluctuations in the future, which will depend on many factors, including the quality of underlying collateral, estimated time for liquidity including potential to be called or restructured, underlying final maturity, insurance guaranty and market conditions, among others.

Should there be further deterioration in the market for auction-rate securities, the value of our portfolio may decline, which may have an adverse impact on our cash position and our earnings. If the accounting rules for these securities change, there may be an adverse impact on our earnings. 

We face risks in connection with our internal control over financial reporting.

Effective internal control over financial reporting is necessary for us to provide reliable and accurate financial reports. If we cannot provide reliable financial reports or prevent fraud or other financial misconduct, our business and operating results could be harmed. Our failure to implement and maintain effective internal control over financial reporting could result in a material misstatement of our financial statements or otherwise cause us to fail to meet our financial reporting obligations. This, in turn, could result in a loss of investor confidence in the accuracy and completeness of our financial reports, which could have an adverse effect on our results of operations and/or have a negative impact on the trading price of our common stock, and could subject us to stockholder litigation. In addition, we cannot assure you that we will not in the future identify further material weaknesses in our internal control over financial reporting that we have not discovered to date, which may impact the reliability of our financial reporting and financial statements.

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Our products must meet specifications, and undetected defects and failures may occur, which may cause customers to return or stop buying our products and may expose us to product liability risk.

Our customers generally establish demanding specifications for quality, performance, and reliability that our products must meet. Integrated circuits as complex as ours often encounter development delays and may contain undetected defects or failures when first introduced or after commencement of commercial shipments, which might require product replacement or recall. Further, our third-party manufacturing processes or changes thereof, or raw material used in the manufacturing processes may cause our products to fail. We have from time to time in the past experienced product quality, performance or reliability problems. Our standard warranty period is generally one to two years, which exposes us to significant risks of claims for defects and failures. If defects and failures occur in our products, we could experience lost revenue, increased costs, including warranty expense and costs associated with customer support, cancellations or rescheduling of orders or shipments, and product returns or discounts, any of which would harm our operating results.

In addition, product liability claims may be asserted with respect to our technology or products. Although we currently have insurance, there can be no assurance that we have obtained a sufficient amount of insurance coverage, that asserted claims will be within the scope of coverage of the insurance, or that we will have sufficient resources to satisfy any asserted claims.

The price and availability of commodities (e.g., gold, copper and silicon) may adversely impact our ability to deliver our products in a timely and cost-effective manner and may adversely affect our business and results of operations.

Our products incorporate commodities such as gold, copper and silicon. An increase in the price or a decrease in the availability of these commodities and similar commodities that we use could negatively impact our business and results of operations.

Fluctuations in the value of the U.S. Dollar relative to other foreign currencies, including the Renminbi, may adversely affect results of operations.

Our manufacturing and packaging suppliers are and will continue to be primarily located in China for the foreseeable future. If the value of the Renminbi rises against the U.S. Dollar, there could be an increase in our manufacturing costs relative to competitors who have manufacturing facilities located in the U.S., which could adversely affect our operations. In addition, because we collect payments from all customers in U.S. dollars, fluctuations in the value of foreign currencies could have an adverse impact on our customers’ business, which could negatively impact our business and results of operations.

We incur foreign currency exchange gains or losses related to the timing of payments between the U.S. and our foreign subsidiaries, which are reported in interest and other income. Fluctuations in the value of foreign currencies could increase the amount of foreign currency exchange losses we record, which could have an adverse impact on our results of operations.

We and our manufacturing partners are or will be subject to extensive Chinese government regulation, and the benefit of various incentives from Chinese governments that we and our manufacturing partners receive may be reduced or eliminated, which could increase our costs or limit our ability to sell products and conduct activities in China.

Most of our manufacturing partners are located in China. In addition, we have established a facility in China, initially for the testing of our ICs. The Chinese government has broad discretion and authority to regulate the technology industry in China. China’s government has implemented policies from time to time to regulate economic expansion in China. It also exercises significant control over China’s economic growth through the allocation of resources, controlling payment of foreign currency-denominated obligations, setting monetary policy and providing preferential treatment to particular industries or companies. New regulations or the readjustment of previously implemented regulations could require us and our manufacturing partners to change our business plans, increase our costs, or limit our ability to sell products and conduct activities in China, which could adversely affect our business and operating results.

In addition, the Chinese government and provincial and local governments have provided, and continue to provide, various incentives to encourage the development of the semiconductor industry in China. Such incentives include tax rebates, reduced tax rates, favorable lending policies and other measures, some or all of which may be available to our manufacturing partners and to us with respect to our facility in China. Any of these incentives could be reduced or eliminated by governmental authorities at any time. Any such reduction or elimination of incentives currently provided to our manufacturing partners could adversely affect our business and operating results. 

20

There are inherent risks associated with the operation of our testing facility in China, which could increase product costs or cause a delay in product shipments.

We have a testing facility in China that began operations in 2006. We face the following risks, among others, with respect to our testing facility in China:

• inability to hire and maintain a qualified workforce;

• inability to maintain appropriate and acceptable manufacturing controls; and

• higher than anticipated overhead and other costs of operation.

If we are unable to maintain our testing facility in China at fully operational status with qualified workers, appropriate manufacturing controls and reasonable cost levels, we may incur higher costs than our current expense levels, which would affect our gross margins. In addition, if capacity restraints result in significant delays in product shipments, our business and results of operations would be adversely affected.

The average selling prices of products in our markets have historically decreased over time and will likely do so in the future, which could harm our revenue and gross profits.

Average selling prices of semiconductor products in the markets we serve have historically decreased over time. Our gross profits and financial results will suffer if we are unable to offset any reductions in our average selling prices by reducing our costs, developing new or enhanced products on a timely basis with higher selling prices or gross profits, or increasing our sales volumes. Additionally, because we do not operate our own manufacturing or assembly facilities, we may not be able to reduce our costs as rapidly as companies that operate their own facilities, and our costs may even increase, which could also reduce our profit margins. 

Because of the lengthy sales cycles for our products and the fixed nature of a significant portion of our expenses, we may incur substantial expenses before we earn associated revenue and may not ultimately achieve our forecasted sales for our products.

The introduction of new products presents significant business challenges because product development plans and expenditures must be made up to two years or more in advance of any sales. It takes us up to 12 months or more to design and manufacture a new product prototype. Only after we have a prototype do we introduce the product to the market and begin selling efforts in an attempt to achieve design wins. This sales process requires us to expend significant sales and marketing resources without any assurance of success. Volume production of products that use our ICs, if any, may not be achieved for an additional period of time after an initial sale. Sales cycles for our products are lengthy for a number of reasons, including:

• our customers usually complete an in-depth technical evaluation of our products before they place a purchase order;

• the commercial adoption of our products by OEMs and ODMs is typically limited during the initial release of their product to evaluate product performance and consumer demand;

• our products must be designed into our customers’ products or systems; and

• the development and commercial introduction of our customers’ products incorporating new technologies frequently are delayed.

As a result of our lengthy sales cycles, we may incur substantial expenses before we earn associated revenue because a significant portion of our operating expenses is relatively fixed and based on expected revenue. The lengthy sales cycles of our products also make forecasting the volume and timing of orders difficult. In addition, the delays inherent in lengthy sales cycles raise additional risks that customers may cancel or change their orders. Our sales are made by purchase orders. Because industry practice allows customers to reschedule or cancel orders on relatively short notice, backlog is not always a good indicator of our future sales. If customer cancellations or product changes occur, we could lose anticipated sales and not have sufficient time to reduce our inventory and operating expenses. 

21

Our success depends on our investment of significant resources in research and development. We may have to invest more resources in research and development than anticipated, which could increase our operating expenses and negatively impact our operating results.

Our success depends on us investing significant amounts of resources into research and development. We expect to have to continue to invest heavily in research and development in the future in order to continue to innovate and come to market with new products in a timely manner and increase our revenue and profitability. If we have to invest more resources in research and development than we anticipate, we could see an increase in our operating expenses which may negatively impact our operating results. Also, if we are unable to properly manage and effectively utilize our research and development resources, we could see material adverse effects on our business, financial condition and operating results.

In addition, if new competitors, technological advances by existing competitors, our entry into new markets, or other competitive factors require us to invest significantly greater resources than anticipated in our research and development efforts, our operating expenses would increase. If we are required to invest significantly greater resources than anticipated in research and development efforts without a corresponding increase in revenue, our operating results could decline. Research and development expenses are likely to fluctuate from time to time to the extent we make periodic incremental investments in research and development and these investments may be independent of our level of revenue which could negatively impact our financial results. In order to remain competitive, we anticipate that we will continue to devote substantial resources to research and development, and we expect these expenses to increase in absolute dollars in the foreseeable future due to the increased complexity and the greater number of products under development.

The loss of any of our key personnel or the failure to attract or retain specialized technical and management personnel could impair our ability to grow our business.

Our future success depends upon our ability to attract and retain highly qualified technical and managerial personnel. We are particularly dependent on the continued services of our key executives, including Michael Hsing, our President and Chief Executive Officer, who founded our company and developed our proprietary process technology. In addition, personnel with highly skilled analog and mixed-signal design engineering expertise are scarce and competition for personnel with these skills is intense. There can be no assurance that we will be able to retain existing key employees or that we will be successful in attracting, integrating or retaining other highly qualified personnel with critical capabilities in the future. If we are unable to retain the services of existing key employees or are unsuccessful in attracting new highly qualified employees quickly enough to meet the demands of our business, including design cycles, our business could be harmed. 

If we fail to retain key employees in sales, applications, finance and legal or to make continued improvements to our internal systems, particularly in the accounting and finance area, our business may suffer.

If we fail to continue to adequately staff our sales, applications, financial and legal staff, maintain or upgrade our business systems and maintain internal control that meet the demands of our business, our ability to operate effectively will suffer. The operation of our business also depends upon our ability to retain these employees, as these employees hold a significant amount of institutional knowledge about us and our products, and, if they were to terminate their employment, our sales and internal control over financial reporting could be adversely affected.

We intend to continue to expand our operations, which may strain our resources and increase our operating expenses.

We plan to continue to expand our domestic and foreign operations through internal growth, strategic relationships, and/or acquisitions. We expect that any such expansion will strain our systems and operational and financial controls. In addition, we are likely to incur significantly higher operating costs. To manage our growth effectively, we must continue to improve and expand our systems and controls, as well as hire experienced administrative and financial personnel. If we fail to do so, our growth will be limited. If we fail to effectively manage our planned expansion of operations, our business and operating results may be harmed.

We may not realize the anticipated benefits of any company or business that we acquire. In addition, acquisitions could result in diluting the ownership interests of our stockholders, reduce our cash balances, and cause us to incur debt or to assume contingent liabilities, which could adversely affect our business.

As a part of our business strategy, from time to time we review acquisition prospects that would complement our current product offerings, enhance our design capability or offer other competitive opportunities. For example, we completed our acquisition of Sensima Technology SA in July 2014 to further our diversification strategy and create new opportunities with key customers. As a result of completing acquisitions, we could use a significant portion of our available cash, cash equivalents and short-term investments, issue equity securities that would dilute current stockholders’ percentage ownership, incur substantial debt or contingent liabilities, and incur impairment charges related to goodwill or other intangibles. Such actions could impact our operating results and the price of our common stock. 

In addition, we may be unable to identify or complete prospective acquisitions for various reasons, including competition from other companies in the semiconductor industry, the valuation expectations of acquisition candidates and applicable antitrust laws or related regulations.  If we are unable to identify and complete acquisitions, we may not be able to successfully expand our business and product offerings.

22

We cannot guarantee that the Sensima acquisition or any future acquisitions will improve our results of operations or that we will otherwise realize the anticipated benefits of any acquisitions. In addition, if we are unsuccessful in integrating any acquired company or business into our operations or if integration is more difficult than anticipated, we may experience disruptions that could harm our business and result in our failure to realize the anticipated benefits of the acquisitions. Some of the risks that may adversely affect our ability to integrate or realize any anticipated benefits from the acquired companies, businesses or assets include those associated with:

• unexpected losses of key employees or customers of the acquired companies or businesses;

• conforming the acquired company’s standards, processes, procedures and controls with our operations;

• coordinating new product and process development;

• hiring additional management and other critical personnel;

• increasing the scope, geographic diversity and complexity of our operations;

• difficulties in consolidating facilities and transferring processes and know-how;

• other difficulties in the assimilation of acquired operations, technologies or products;

• the risk of undisclosed liabilities of the acquired businesses and potential legal disputes with founders or stockholders of acquired companies;

• our inability to commercialize acquired technologies;

• the risk that the future business potential as projected is not realized and as a result, we may be required to take a charge to earnings that would impact our profitability;

• the need to take impairment charges or write-downs with respect to acquired assets and technologies;

• diversion of management’s attention from other business concerns; and

• adverse effects on existing business relationships with customers.

We compete against many companies with substantially greater financial and other resources, and our market share may be reduced if we are unable to respond to our competitors effectively.

The analog and mixed-signal semiconductor industry is highly competitive, and we expect competitive pressures to continue. Our ability to compete effectively and to expand our business will depend on our ability to continue to recruit applications and design talent, our ability to introduce new products, and our ability to maintain the rate at which we introduce these new products. We compete with domestic and non-domestic semiconductor companies, many of which have substantially greater financial and other resources with which to pursue engineering, manufacturing, marketing, and distribution of their products. We are in direct and active competition, with respect to one or more of our product lines, with at least 10 manufacturers of such products, of varying size and financial strength. The number of our competitors has grown due to the expansion of the market segments in which we participate. 

We cannot assure you that our products will continue to compete favorably or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering this market, which would materially and adversely affect our results of operations and our financial condition.

If securities or industry analysts downgrade our stock or do not continue to publish research or reports about our business, our stock price and trading volume could decline.

The trading market for our common stock will depend, in part, on the research and reports that industry or securities analysts publish about us or our business. We do not have any control over these analysts. If one or more of the analysts who cover us downgrade our stock, our stock price would likely decline. If one or more of these analysts cease coverage of us or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

23

Major earthquakes or other natural disasters and resulting systems outages may cause us significant losses.

Our corporate headquarters, the production facilities of our third-party wafer suppliers, our IC testing facility, a portion of our assembly and research and development activities, and certain other critical business operations are located in or near seismically active regions and are subject to periodic earthquakes. We do not maintain earthquake insurance and could be materially and adversely affected in the event of a major earthquake. Much of our revenue, as well as our manufacturers and assemblers, are concentrated in Asia. Such concentration increases the risk that other natural disasters, labor strikes, terrorism, war, political unrest, epidemics, and/or health advisories could disrupt our operations. In addition, we rely heavily on our internal information and communications systems and on systems or support services from third parties to manage our operations efficiently and effectively. Any of these are subject to failure due to a natural disaster or other disruption. System-wide or local failures that affect our information processing could have material adverse effects on our business, financial condition, operating results, and cash flows.

There can be no assurance that we will continue to declare cash dividends at all or in any particular amounts.

In June 2014, the Board of Directors approved a dividend program pursuant to which we intend to pay quarterly cash dividends on our common stock. We anticipate the cash used for future dividends will come from our current domestic cash and cash generated from ongoing U.S. operations. If cash held by our international subsidiaries is needed for the payment of dividends, we may be required to accrue and pay U.S. taxes to repatriate these funds.

The declaration of cash dividends on our common stock is at the discretion of our Board of Directors. Any future decision to declare and pay a cash dividend on our common stock will be subject to, among other things, our results of operations, cash balances and future cash requirements, financial condition, statutory requirements of Delaware law, compliance with the terms of future indebtedness and credit facilities, and other factors that our Board of Directors may deem relevant. Our dividend payments may change from time to time, and we cannot provide assurance that we will continue to declare dividends at all or in any particular amounts. A reduction in or elimination of our dividend payments could have a negative effect on the price of our common stock.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

None.

ITEM 2.    PROPERTIES

Our primary operations are located in San Jose, California and Chengdu, China. We occupy an owned facility located at 79 Great Oaks Boulevard in San Jose, California, which serves as our corporate headquarters and sales offices. The property consists of a building with approximately 106,262 square feet and 5.5 acres of land. 

We lease a facility with approximately 56,000 square feet in Chengdu, China, which serves as our test facility and manufacturing hub. In addition, we constructed a 150,000 square-foot research and development facility in Chengdu, China, which was put into operation in October 2010.

We also lease sales and research and development offices in the United States, Europe, Japan, China, Taiwan and Korea. We believe that our existing facilities are adequate for our current operations.

ITEM 3.    LEGAL PROCEEDINGS

We and certain of our subsidiaries are parties to actions and proceedings in the ordinary course of business, including litigation regarding our shareholders and our intellectual property, challenges to the enforceability or validity of our intellectual property and claims that our products infringe on the intellectual property rights of others. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. We defend ourselves vigorously against any such claims.

As of December 31, 2014, there were no material pending legal proceedings to which we were a party.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5.    MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDERS MATTERS, AND ISSUER PURCHASES OF EQUITY SECURITIES.

Market Price of Our Common Stock

Our common stock is traded on the Nasdaq Global Select Market under the symbol “MPWR”. The following table sets forth the high and low sales price per share of our common stock:

	High		Low
2014:
First quarter	$	38.86	$	31.36
Second quarter	$	42.48	$	35.14
Third quarter	$	47.78	$	40.77
Fourth quarter	$	50.44	$	34.47
2013:
First quarter	$	25.51	$	22.18
Second quarter	$	25.02	$	20.99
Third quarter	$	31.05	$	23.93
Fourth quarter	$	34.66	$	27.59

Holders of Our Common Stock

As of February 23, 2015, there were 12 registered holders of record of our common stock. A substantially greater number of holders of our common stock are “street name” or beneficial holders, whose shares are held by banks, brokers and other financial institutions.

Dividend Policy

In June 2014, our Board of Directors approved a dividend program pursuant to which we intend to pay quarterly cash dividends on our common stock. Stockholders of record as of the last day of the quarter are entitled to receive the quarterly cash dividends declared by our Board of Directors, which are payable on the 15th of the following month. Our Board of Directors declared the following cash dividends in 2014 (in thousands, except per share amounts):

	Dividend Declared		Total
	per Share		Amount
2014:
Second quarter	$	0.15	$	5,817
Third quarter	$	0.15	$	5,823
Fourth quarter	$	0.15	$	5,826

The declaration of any future cash dividends is at the discretion of our Board of Directors and will depend on our financial condition, results of operations, capital requirements, business conditions and other factors, as well as a determination that cash dividends are in the best interests of our stockholders. We anticipate that the cash used for future dividends will come from our current domestic cash and cash generated from ongoing U.S. operations. If cash held by our international subsidiaries is needed for the payment of dividends, we may be required to accrue and pay U.S. taxes to repatriate the funds.

25

Performance of Our Common Stock

The following graph compares the cumulative five-year total return on our common stock relative to the cumulative total returns of the Nasdaq Composite Index, the S&P 500 Index and the Philadelphia Semiconductor Index. An investment of $100 (with reinvestment of all dividends) is assumed to have been made in our common stock on December 31, 2009 and its relative performance is tracked through December 31, 2014.

The information contained in the stock performance graph section shall not be deemed to be “soliciting material” or “filed” or incorporated by reference in future filings with the SEC, or subject to the liabilities of Section 18 of the Exchange Act, except to the extent that the Company specifically incorporates it by reference into a document filed under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

Stock repurchase activities during the three months ended December 31, 2014 were as follows (in thousands, except per share amounts):

	Total Number of Shares Purchased (a)		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program		Dollar Value of Shares That May Yet Be Purchased Under the Program
October 1 - October 31		107	$	38.57		107
November 1 - November 30		41	$	45.62		41
December 1 - December 31		45	$	48.97		45
Total		193	$	42.48		193	$	38,187

(a) In July 2013, the Board of Directors approved a stock repurchase program that authorizes us to repurchase up to $100 million in the aggregate of our common stock through June 30, 2015. Under the program, shares may be repurchased in privately negotiated or open market transactions, including under a Rule 10b5-1 plan. Shares are retired upon repurchase.

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ITEM 6.    SELECTED FINANCIAL DATA

The following financial data is derived from our audited annual consolidated financial statements as of and for the years ended December 31, 2014, 2013, 2012, 2011 and 2010. You should read the following table in conjunction with the consolidated financial statements and the related notes contained in Item 8 in this Annual Report on Form 10-K. Operating results for any year are not necessarily indicative of results to be expected for any future periods.

Consolidated Statement of Operations Data:

	Year Ended December 31,
	2014			2013			2012			2011		2010
	(in thousands, except per share amounts)
Revenue	$	282,535		$	238,091		$	213,813		$	196,519	$	218,840
Cost of revenue		129,917			110,190			100,665			94,925		97,383
Gross profit		152,618			127,901			113,148			101,594		121,457
Operating expenses:
Research and development		58,590			49,733			48,796			44,518		44,372
Selling, general and administrative		66,755			54,624			50,018			40,280		41,169
Litigation expense (benefit), net		(8,027	)		(371	)		(2,945	)		3,379		5,418
Total operating expenses		117,318			103,986			95,869			88,177		90,959
Income from operations		35,300			23,915			17,279			13,417		30,498
Interest and other income, net		1,092			92			611			309		922
Income before income taxes		36,392			24,007			17,890			13,726		31,420
Income tax provision		897			1,109			2,134			425		1,857
Net income	$	35,495		$	22,898		$	15,756		$	13,301	$	29,563
Net income per share:
Basic	$	0.92		$	0.61		$	0.45		$	0.39	$	0.83
Diluted	$	0.89		$	0.59		$	0.43		$	0.38	$	0.78
Weighted-average shares outstanding:
Basic		38,686			37,387			34,871			34,050		35,830
Diluted		39,793			38,620			36,247			35,160		37,826
Cash dividends declared per common share	$	0.45		$	-		$	1.00		$	-	$	-

Consolidated Balance Sheet Data:

	As of December 31,
	2014		2013		2012		2011		2010
	(in thousands)
Cash and cash equivalents	$	126,266	$	101,213	$	75,104	$	96,371	$	48,010
Short-term investments	$	112,452	$	125,126	$	85,521	$	77,827	$	129,709
Long-term investments	$	5,389	$	9,860	$	11,755	$	13,675	$	19,180
Total assets	$	399,366	$	368,908	$	287,162	$	273,867	$	281,603
Long-term income tax liabilities	$	5,876	$	5,542	$	5,408	$	4,920	$	5,015
Common stock	$	240,500	$	234,201	$	194,079	$	159,336	$	178,269
Total stockholders' equity	$	346,425	$	323,399	$	258,294	$	242,877	$	246,895
Working capital	$	271,285	$	253,597	$	190,841	$	185,435	$	195,403

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ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with the consolidated financial statements and related notes which appear under Item 8 in this Annual Report on Form 10-K.

Overview

We are a leading company in high performance power solutions. Founded in 1997, we pioneered integrated power semiconductor solutions and power delivery architectures. Our mission is to provide innovative power solutions in cloud computing, telecommunications, industrial and automotive, and consumer market segments. We believe that we differentiate ourselves by offering solutions that are more highly integrated, smaller in size, more energy efficient, more accurate with respect to performance specifications and, consequently, more cost-effective than many competing solutions. We plan to continue to introduce new products within our existing product families, as well as in new innovative product categories.

We operate in the cyclical semiconductor industry where there is seasonal demand for certain products. We are not and will not be immune from current and future industry downturns, but we have targeted product and market areas that we believe have the ability to offer above average industry performance.

We work with third parties to manufacture and assemble our integrated circuits (“ICs”). This has enabled us to limit our capital expenditures and fixed costs, while focusing our engineering and design resources on our core strengths.

Following the introduction of a product, our sales cycle generally takes a number of quarters after we receive an initial customer order for a new product to ramp up. Typical lead time for orders is fewer than 90 days. These factors, combined with the fact that orders in the semiconductor industry can typically be cancelled or rescheduled without significant penalty to the customer, make the forecasting of our orders and revenue difficult.

We derive most of our revenue from sales through distribution arrangements and direct sales to customers in Asia, where the products we produce are incorporated into end-user products. Our revenue from direct or indirect sales to customers in Asia was 91% and 90% for the years ended December 31, 2014 and 2013, respectively. We derive a majority of our revenue from the sales of our DC to DC converter product family which services the communications, storage and computing, consumer and industrial markets. We believe our ability to achieve revenue growth will depend, in part, on our ability to develop new products, enter new market segments, gain market share, manage litigation risk, diversify our customer base and successfully secure manufacturing capacity.

In July 2014, we completed the acquisition of Sensima Technology SA (“Sensima”), a company located in Switzerland that develops magnetic sensors for angle measurements as well as three-dimensional magnetic field sensing. The acquisition is expected to create new opportunities with customers by offering enhanced solutions in power management for key industries such as automotive, industrial and cloud computing. The purchase consideration consisted of an upfront cash payment of $11.7 million and additional consideration that is contingent upon Sensima achieving a new product introduction and certain revenue and direct margin goals in 2016, with a fair value of $2.5 million at the date of acquisition. In addition, key employees received $1.7 million of time-based restricted stock units and up to $8.0 million of performance-based restricted stock units in connection with the transaction. These equity awards are considered arrangements for post-acquisition services and the related compensation expense is being recognized over the requisite service period. The results of operations of Sensima have been included in our consolidated financial statements subsequent to the acquisition date.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the U.S. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amount of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on an on-going basis, including those related to revenue recognition, stock-based compensation, inventories, income taxes, valuation of goodwill and intangible assets, and contingencies. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making the judgments about the carrying values of assets and liabilities that are not readily apparent from other sources.  Estimates and judgments used in the preparation of our financial statements are, by their nature, uncertain and unpredictable, and depend upon, among other things, many factors outside of our control, such as demand for our products and economic conditions.  Accordingly, our estimates and judgments may prove to be incorrect and actual results may differ, perhaps significantly, from these estimates.

We believe the following critical accounting policies reflect our more significant judgments used in the preparation of our consolidated financial statements.

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Revenue Recognition

We recognize revenue when the following four basic criteria are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Determination of criteria (3) and (4) are based on management’s judgment regarding the fixed nature of the fees charged for products delivered and the collectability of those fees. The application of these criteria has resulted in us generally recognizing revenue upon shipment (when title passes) to customers, including distributors, original equipment manufacturers and electronic manufacturing service providers.

Our revenue consists primarily of sales of assembled and tested finished goods. We also sell die in wafer form to our customers and value-added resellers, and we receive royalty revenue from third parties and value-added resellers.

For the years ended December 31, 2014 and 2013, approximately 92% and 91% of our distributor sales, respectively, including sales to our value-added resellers, were made through distribution arrangements with third parties. These arrangements do not include any special payment terms (normal payment terms are 30-45 days for our distributors), price protection or exchange rights. Returns are limited to our standard product warranty. Certain of our large distributors have contracts that include limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases.

For the years ended December 31, 2014 and 2013, approximately 8% and 9% of our distributor sales, respectively, were made through small distributors primarily based on purchase orders. These distributors typically have no stock rotation rights.

We generally recognize revenue upon shipment of products to the distributors for the following reasons:

(1)	The price is fixed or determinable at the date of sale. We do not offer special payment terms, price protection or price adjustments to distributors when we recognize revenue upon shipment.
(2)	The distributors are obligated to pay us and this obligation is not contingent on the resale of our products.
(3)	The distributors’ obligation is unchanged in the event of theft or physical destruction or damage to the products.
(4)	The distributors have stand-alone economic substance apart from our relationship.
(5)	We do not have any obligations for future performance to directly bring about the resale of our products by the distributors.
(6)	The amount of future returns can be reasonably estimated. We have the ability and the information necessary to track inventory sold to and held at our distributors. We maintain a history of returns and have the ability to estimate the stock rotation returns on a quarterly basis.

We maintain a sales reserve for stock rotation rights, which is based on historical experience of actual stock rotation returns on a per distributor basis, where available, and information related to products in the distribution channel. This reserve is recorded at the time of sale. Historically, these returns were not material to our consolidated financial statements.  In the future, if we are not able to estimate our stock rotation returns accurately, we may have to recognize revenue when the distributors sell such inventory to end customers.

If we enter into arrangements that have rights of return that are not estimable, we recognize revenue under such arrangements only after the distributors have sold the products to end customers. Three of our U.S. distributors have distribution agreements where revenue is recognized upon sale by these distributors to their end customers because these distributors have certain rights of return which management believes are not estimable. The deferred revenue balance from these distributors as of December 31, 2014 and 2013 was $2.0 million and $1.7 million, respectively. The deferred costs as of December 31, 2014 and 2013 were $0.2 million.

We generally provide a one to two-year warranty against defects in materials and workmanship. Under this warranty, we will repair the goods, provide replacements at no charge, or, under certain circumstances, provide a refund to the customer for defective products. Estimated warranty returns and warranty costs are based on historical experience and are recorded at the time product revenue is recognized.

Inventory Valuation

We value our inventory at the lower of the standard cost (which approximates actual cost on a first-in, first-out basis) or its current estimated market value.  We write down inventory for obsolescence or lack of demand, based on assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required. Conversely, if market conditions are more favorable, inventory may be sold that was previously reserved. 

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Valuation of Goodwill and Acquisition-Related Intangible Assets

We evaluate intangible assets with finite lives for impairment whenever events or changes in circumstances indicate that an impairment may exist. We perform an annual impairment assessment for goodwill and intangible assets with indefinite lives in the fourth quarter, or more frequently if indicators of potential impairment exist. Impairment of intangible assets is recognized based on the difference between the fair value of the assets and their carrying value. Impairment for goodwill occurs if the fair value of a reporting unit including goodwill is less than its carrying value and is recognized based on the difference between the implied fair value of the reporting unit’s goodwill and the carrying value of the goodwill. The assumptions and estimates used to determine future values of goodwill and intangible assets are complex and subjective. They can be affected by various factors, including external factors such as industry and economic trends, and internal factors such as changes in our business strategy and revenue forecasts. If there is a significant adverse change in our business in the future, including macroeconomic and market conditions, we may be required to record impairment charges on our goodwill and acquisition-related intangible assets.

Accounting for Income Taxes 

ASC 740-10, Income Taxes – Overall, prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. This interpretation also provides guidance on classification, interest and penalties, accounting in interim periods and disclosure. In accordance with ASC 740-10, we recognize federal, state and foreign current tax liabilities or assets based on our estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. We also recognize federal, state and foreign deferred tax assets or liabilities for our estimate of future tax effects attributable to temporary differences and carryforwards. We record a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

Our calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. Our estimates of current and deferred tax assets and liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where we operate, or changes in other facts or circumstances. In addition, we recognize liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on our tax returns if it has less than a 50% likelihood of being sustained. If we determine that payment of these amounts is unnecessary or if the recorded tax liability is less than our current assessment, we may be required to recognize an income tax benefit or additional income tax expense in our financial statements in the period such determination is made. We have calculated our uncertain tax positions which were attributable to certain estimates and judgments primarily related to transfer pricing, cost sharing and our international tax structure exposure.

As of December 31, 2014, and 2013, we had a valuation allowance of $19.1 million and $16.7 million, respectively, attributable to management’s determination that it is more likely than not that most of the deferred tax assets in the U.S. will not be realized. Should it be determined that additional amounts of the net deferred tax asset will not be realized in the future, an adjustment to increase the deferred tax asset valuation allowance will be charged to income in the period such determination is made. Likewise, in the event we were to determine that it is more likely than not that we would be able to realize our deferred tax assets in the future in excess of our net recorded amount, an adjustment to the valuation allowance for the deferred tax asset would increase income in the period such determination was made.

As a result of the cost sharing arrangements with our international subsidiaries (cost share arrangements), relatively small changes in costs that are not subject to sharing under the cost share arrangements can significantly impact the overall profitability of the U.S. entity. Because of the U.S. entity’s inconsistent earnings history and uncertainty of future earnings, we have determined that it is more likely than not that the U.S. deferred tax benefits will not be realized.

Contingencies

We are a party to actions and proceedings incident to our business in the ordinary course of business, including litigation regarding our intellectual property, challenges to the enforceability or validity of our intellectual property and claims that our products infringe on the intellectual property rights of others. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, we become aware that we are subject to other contingent liabilities. When this occurs, we will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, we use our judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If we determine a loss is probable and estimable, we record a contingent loss. In determining the amount of a contingent loss, we take into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, we may need to record additional contingent losses that could materially and adversely impact our results of operations. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed which could result in a favorable impact on our results of operations.

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Stock-Based Compensation

We measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. We use the Black-Scholes model to estimate the fair value of our options and shares issued under employee stock purchase plan. The fair value of time-based and performance-based restricted stock units is based on the grant date share price. The fair value of market-based restricted stock units is estimated using a Monte Carlo simulation model.

We recognize compensation expense equal to the grant-date fair value for all share-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire awards, unless the awards are subject to performance or market conditions, in which case we recognize compensation expense over the requisite service period of each separate vesting tranche. For the performance-based awards, we recognize compensation expense when it becomes probable that the performance criteria set by the Board of Directors will be achieved. For the market-based awards, compensation expense is not reversed if the market condition is not satisfied. If the actual performance targets achieved differ significantly from those projected by management, additional stock-based compensation expense may be recorded for the performance-based awards, which could have an adverse impact on our results of operations. Furthermore, the amount of stock-based compensation that we recognize is based on an expected forfeiture rate. If there is a difference between the forfeiture assumptions used in determining stock-based compensation costs and the actual forfeitures which become known over time, we may change the forfeiture rate, which could have a significant impact on our stock-based compensation expense.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard gives guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists, with the purpose of reducing diversity in practice. This new standard requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. We adopted this standard in the first quarter of 2014 prospectively and the adoption did not have an impact on our consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Under the new standard, entities will apply the following five-step model when evaluating revenue contracts with customers:

(1) Identify the contract with a customer.

(2) Identify the performance obligations in the contract.

(3) Determine the transaction price.

(4) Allocate the transaction price to the performance obligations in the contract.

(5) Recognize revenue when the entity satisfies a performance obligation.

The new standard is effective for annual and interim reporting periods beginning after December 15, 2016. Entities have the option of using either a full retrospective or a modified retrospective application in the adoption of this standard. We will adopt the standard in the first quarter of 2017 and are evaluating the transition method and the impact of the adoption on our consolidated financial position, results of operations and cash flows.

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Results of Operations

The following table summarizes our results of operations:

	Year Ended December 31,
	2014					2013					2012
	(in thousands, except percentages)
Revenue	$	282,535		100.0	%	$	238,091		100.0	%	$	213,813		100.0	%
Cost of revenue		129,917		46.0			110,190		46.3			100,665		47.1
Gross profit		152,618		54.0			127,901		53.7			113,148		52.9
Operating expenses:
Research and development		58,590		20.7			49,733		20.9			48,796		22.8
Selling, general and administrative		66,755		23.6			54,624		22.9			50,018		23.4
Litigation benefit, net		(8,027	)	(2.8	)		(371	)	(0.2	)		(2,945	)	(1.4	)
Total operating expenses		117,318		41.5			103,986		43.6			95,869		44.8
Income from operations		35,300		12.5			23,915		10.1			17,279		8.1
Interest and other income, net		1,092		0.4			92		0.0			611		0.3
Income before income taxes		36,392		12.9			24,007		10.1			17,890		8.4
Income tax provision		897		0.3			1,109		0.5			2,134		1.0
Net income	$	35,495		12.6	%	$	22,898		9.6	%	$	15,756		7.4	%

Revenue

The following table summarizes our revenue by product family:

	Year Ended December 31,															Change
Product Family	2014		% of Revenue			2013		% of Revenue			2012		% of Revenue			From 2013 to 2014			From 2012 to 2013
	(In thousands, except percentages)
DC to DC products	$	253,083		89.6	%	$	211,337		88.8	%	$	188,736		88.3	%		19.8	%		12.0	%
Lighting control products		29,452		10.4	%		26,754		11.2	%		25,077		11.7	%		10.1	%		6.7	%
Total	$	282,535		100.0	%	$	238,091		100.0	%	$	213,813		100.0	%		18.7	%		11.4	%

Revenue for the year ended December 31, 2014 was $282.5 million, an increase of $44.4 million, or 18.7%, from $238.1 million for the year ended December 31, 2013. This increase was due to higher sales of both DC to DC and lighting control products, as unit shipments increased 37% due to higher market demand with current customers and additional design wins with new customers, which were offset in part by a 13% decrease in average sales prices. Revenue from our DC to DC products was $253.1 million for the year ended December 31, 2014, an increase of $41.7 million, or 19.8%, from the same period in 2013. This increase was primarily due to higher sales of our DC to DC converters, offset in part by lower sales of our Mini-Monsters products. Revenue from our lighting control products was $29.5 million for the year ended December 31, 2014, an increase of $2.7 million, or 10.1%, compared with the same period in 2013.

Revenue for the year ended December 31, 2013 was $238.1 million, an increase of $24.3 million, or 11.4%, from $213.8 million for the year ended December 31, 2012. This increase was due to higher sales of both DC to DC and lighting control products, as unit shipments increased 18% due to higher market demand with current customers and additional design wins with new customers, which were offset in part by a 6% decrease in average sales prices. Revenue from our DC to DC products was $211.3 million for the year ended December 31, 2013, an increase of $22.6 million, or 12.0%, from the same period in 2012. This increase was primarily due to higher sales of our DC to DC converters, Mini-Monsters, PMICs and battery charger products. Revenue from our lighting control products was $26.8 million for the year ended December 31, 2013, an increase of $1.7 million, or 6.7%, compared with the same period in 2012.

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Cost of Revenue and Gross Margin 

Cost of revenue consists primarily of costs incurred to manufacture, assemble and test our products, as well as warranty costs, inventory-related expenses and other overhead costs and stock-based compensation expenses. In addition, cost of revenue includes amortization of intangible assets from the Sensima acquisition beginning in the third quarter of 2014.

	Year Ended December 31,									Change
	2014			2013			2012			From 2013 to 2014			From 2012 to 2013
	(in thousands, except percentages)
Cost of revenue	$	129,917		$	110,190		$	100,665			17.9	%		9.5	%
Cost of revenue as a percentage of revenue		46.0	%		46.3	%		47.1	%
Gross profit	$	152,618		$	127,901		$	113,148			19.3	%		13.0	%
Gross margin		54.0	%		53.7	%		52.9	%

Cost of revenue was $129.9 million, or 46.0% of revenue, for the year ended December 31, 2014, and $110.2 million, or 46.3% of revenue, for the year ended December 31, 2013. The $19.7 million increase in cost of revenue was primarily due to a 37% increase in unit shipments, which was partially offset by a 14% decrease in the average direct cost of units shipped. In addition, the increase in cost of revenue was driven by an increase of $0.8 million in the provision for inventory reserve, and an increase of $0.7 million in amortization of intangible assets from the Sensima acquisition in July 2014.

Gross profit as a percentage of revenue, or gross margin, was 54.0% for the year ended December 31, 2014, compared to 53.7% for the year ended December 31, 2013. The increase in gross margin was primarily due to higher absorption of in-house test manufacturing overhead, compared to the same period in 2013. This increase was partially offset by an increase in the provision for inventory reserve and an increase in the amortization of intangible assets from the Sensima acquisition in July 2014. 

Cost of revenue was $110.2 million, or 46.3% of revenue, for the year ended December, 2013, and $100.7 million, or 47.1% of revenue, for the year ended December, 2012. The $9.5 million increase in cost of revenue was primarily due to an 18% increase in unit shipments, which was partially offset by an 8% decrease in the average direct cost of units shipped. The increase in cost of revenue was partially offset by a decrease of $0.5 million in the provision for inventory reserve.

Gross margin was 53.7% for the year ended December 31, 2013, compared to 52.9% for the year ended December 31, 2012. The increase in gross margin was primarily due to increased sales of higher margin products and a lower provision for inventory reserve. This increase was partially offset by lower absorption of in-house test manufacturing overhead.

Research and Development  

Research and development expenses primarily consist of salary and benefit expenses, bonuses and stock-based compensation expenses for design and product engineers, expenses related to new product development and supplies, and facility costs. 

 

	Year Ended December 31,									Change
	2014			2013			2012			From 2013 to 2014			From 2012 to 2013
	(in thousands, except percentages)
Research and development ("R&D")	$	58,590		$	49,733		$	48,796			17.8	%		1.9	%
R&D as a percentage of revenue		20.7	%		20.9	%		22.8	%

R&D expenses were $58.6 million, or 20.7% of revenue, for the year ended December 31, 2014 and $49.7 million, or 20.9% of revenue, for the year ended December 31, 2013. The $8.9 million increase in R&D expenses was primarily due to an increase of $2.8 million in stock-based compensation expenses primarily associated with the performance-based and market-based equity awards, an increase of $2.4 million in new product development expenses, an increase of $2.0 million in cash compensation expenses, which include salary, benefits and bonuses, and an increase of $0.6 million in manufacturing and laboratory supplies. Our R&D headcount was 476 employees as of December 31, 2014, compared with 449 employees as of December 31, 2013.

R&D expenses were $49.7 million, or 20.9% of revenue, for the year ended December 31, 2013 and $48.8 million, or 22.8% of revenue, for the year ended December 31, 2012. The $0.9 million increase in R&D expenses was primarily due to an increase of $1.6 million in depreciation expense, and an increase of $0.7 million in cash compensation expenses, which include salary, benefits and bonuses. These increases were partially offset by a decrease of $0.7 million in stock-based compensation expenses primarily due to the cancellation of certain performance-based equity awards. Our R&D headcount was 449 employees as of December 31, 2013, compared with 388 employees as of December 31, 2012.

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Selling, General and Administrative

Selling, general and administrative expenses primarily include salary and benefit expenses, bonuses and stock-based compensation expenses for sales, marketing and administrative personnel, sales commissions, travel expenses, facilities costs, and professional service fees.

	Year Ended December 31,									Change
	2014			2013			2012			From 2013 to 2014			From 2012 to 2013
	(in thousands, except percentages)
Selling, general and administrative ("SG&A")	$	66,755		$	54,624		$	50,018			22.2	%		9.2	%
SG&A as a percentage of revenue		23.6	%		22.9	%		23.4	%

SG&A expenses were $66.8 million, or 23.6% of revenue, for the year ended December 31, 2014 and $54.6 million, or 22.9% of revenue, for the year ended December 31, 2013. The $12.2 million increase in SG&A expenses was primarily due to an increase of $9.7 million in stock-based compensation expenses primarily associated with the performance-based and market-based equity awards, an increase of $0.9 million in professional service fees primarily due to the acquisition of Sensima, an increase of $0.5 million in cash compensation expenses, which include salary, benefits and bonuses, and an increase of $0.3 million in commission expenses due to higher revenue. Our SG&A headcount was 274 employees as of December 31, 2014, compared to 249 employees as of December 31, 2013.

SG&A expenses were $54.6 million, or 22.9% of revenue, for the year ended December 31, 2013 and $50.0 million, or 23.4% of revenue, for the year ended December 31, 2012. The $4.6 million increase in SG&A expenses was primarily due to an increase of $2.6 million in stock-based compensation expenses primarily associated with the performance-based awards, an increase of $1.8 million in cash compensation expenses, which include salary, benefits and bonuses, and an increase of $1.0 million in commission expenses due to higher revenue. These increases were partially offset by a decrease of $1.1 million in professional service fees. Our SG&A headcount was 249 employees as of December 31, 2013, compared to 250 employees as of December 31, 2012.

Litigation Benefit, Net

Litigation benefit, net, was $(8.0) million for the year ended December 31, 2014, compared to litigation benefit, net, of $(0.4) million for the year ended December 31, 2013. Net litigation benefit for the year ended December 31, 2014 included the recognition of a $9.5 million award from the O2 Micro litigation, partially offset by $0.5 million of additional legal fees incurred in connection with the final resolution of the litigation. Net litigation benefit for the year ended December 31, 2013 included $0.8 million of proceeds received in connection with the legal settlement with Silergy Corporation. The increase in net litigation benefit for the year ended December 31, 2014 was partially offset by higher expenses we incurred in other litigation matters, compared to the same period in 2013.

Litigation benefit, net, was $(0.4) million for the year ended December 31, 2013, compared to litigation benefit, net, of $(2.9) million for the year ended December 31, 2012. The year-over-year decrease in litigation benefit was primarily due to $0.8 million received in 2013 in connection with the settlement from Silergy, compared with $3.7 million received in 2012 in connection with settlements from Linear and Silergy. No further amount was due to us from these two lawsuits as of December 31, 2013.

For a complete description of our material litigation matters, see Note 13 “Litigation” of Notes to Consolidated Financial Statements.

Interest and Other Income, Net

For the years ended December 31, 2014, 2013 and 2012, interest and other income, net, was $1.1 million, $0.1 million and $0.6 million, respectively. Interest and other income, net increased from 2013 to 2014 primarily due to lower foreign currency exchange losses and higher interest income in 2014 compared to 2013. Interest and other income, net, decreased from 2012 to 2013 primarily due to higher foreign currency exchange losses and lower interest income in 2013 compared to 2012.

Income Tax Provision

The income tax provision for the year ended December 31, 2014 was $0.9 million or 2.5% of our income before income taxes. This differs from the federal statutory rate primarily because our foreign income was taxed at lower rates and because of the benefit that we realized as a result of stock options exercised and restricted units released and changes in our valuation allowance during the year.

The income tax provision for the year ended December 31, 2013 was $1.1 million or 4.6% of our income before income taxes. This differs from the federal statutory rate primarily because our foreign income was taxed at lower rates and because of the benefit that we realized as a result of stock options exercised and restricted units released and changes in our valuation allowance during the year.

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The income tax provision for the year ended December 31, 2012 was $2.1 million or 11.9% of our income before income taxes. This differs from the federal statutory rate primarily because our foreign income was taxed at lower rates.

For additional information, see Note 11 “Income Taxes” of the Notes to Consolidated Financial Statements.

Liquidity and Capital Resources

	As of December 31,
	2014			2013
	(In thousands)
Cash and cash equivalents	$	126,266		$	101,213
Short-term investments		112,452			125,126
Total cash, cash equivalents and short-term investments	$	238,718		$	226,339
Percentage of total assets		59.8	%		61.4	%
Total current assets	$	308,146		$	292,086
Total current liabilities		(36,861	)		(38,489	)
Working capital	$	271,285		$	253,597

As of December 31, 2014, we had cash and cash equivalents of $126.3 million and short-term investments of $112.5 million, compared with cash and cash equivalents of $101.2 million and short-term investments of $125.1 million as of December 31, 2013. As of December 31, 2014, $56.4 million of cash and cash equivalents and $35.8 million of short-term investments were held by our international subsidiaries. If these funds are needed for our operations in the U.S., we may be required to accrue and pay U.S. taxes to repatriate these funds. However, our intent is to indefinitely reinvest these funds outside of the U.S. and our current plans do not demonstrate a need to repatriate them to fund our U.S. operations.

The significant components of our working capital are cash and cash equivalents, short-term investments, accounts receivable, inventories, prepaid expenses and other current assets, reduced by accounts payable, accrued compensation and related benefits, and other accrued liabilities. As of December 31, 2014, we had working capital of $271.3 million, compared with working capital of $253.6 million as of December 31, 2013. The $17.7 million increase in working capital was due to a $16.1 million increase in current assets and a $1.6 million decrease in current liabilities. The increase in current assets was primarily due to an increase in cash and cash equivalents, an increase in inventory, and an increase in accounts receivable, partially offset by a decrease in short-term investments. The decrease in current liabilities was primarily due to a decrease in accrued compensation and related benefits, and a decrease in other accrued liabilities, partially offset by an increase in accounts payable.

Summary of Cash Flows 

The following table summarizes our cash flow activities:

	Year Ended December 31,
	2014			2013			2012
	(In thousands)
Net cash provided by operating activities	$	74,133		$	60,686		$	24,912
Net cash used in investing activities		(9,367	)		(54,324	)		(26,837	)
Net cash provided by (used in) financing activities		(39,227	)		18,850			(19,553	)
Effect of exchange rate changes on cash and cash equivalents		(486	)		897			211
Net increase (decrease) in cash and cash equivalents	$	25,053		$	26,109		$	(21,267	)

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For the year ended December 31, 2014, net cash provided by operating activities was $74.1 million, primarily due to our net income adjusted for certain non-cash items, including depreciation and amortization and stock-based compensation, and a net decrease of $8.0 million from the changes in our operating assets and liabilities. The increase in accounts receivable was primarily due to higher sales and an increase in shipments in the fourth quarter of 2014. The increase in inventories was primarily due to an increase in strategic wafer and die bank inventories as well as an increase in finished goods necessary to meet anticipated future demand. The increase in accounts payable was primarily driven by increased inventory and capital asset purchases to meet anticipated future demand. The decrease in accrued liabilities was primarily driven by the release of the liability related to the O2 Micro litigation, partially offset by an increase in employee contributions to the deferred compensation plan. For the year ended December 31, 2013, net cash provided by operating activities was $60.7 million, primarily due to cash contributed from our operating results during the year and the cash payment received in connection with the O2 Micro litigation recorded as a liability as of December 31, 2013. These increases were partially offset by increases in both inventories and accounts receivable. The increase in accounts receivable resulted primarily from an increase in shipments. The increase in inventories was primarily due to an increase in strategic wafer and die bank inventories as well as finished goods to meet anticipated future demand. For the year ended December 31, 2012, net cash provided by operating activities was $24.9 million, primarily reflecting cash contributed from our operating results, partially offset by $27.8 million increase in working capital requirements.

For the year ended December 31, 2014, net cash used in investing activities was $9.4 million, primarily due to net cash of $11.6 million paid to acquire Sensima, purchases of property and equipment of $9.5 million, and net purchases of investments of $7.1 million, partially offset by proceeds of $4.7 million from the redemption of auction-rate securities. For the year ended December 31, 2013, net cash used in investing activities was $54.3 million, primarily reflecting net purchases of short-term investments and purchases of property and equipment, partially offset by proceeds from the redemption of auction-rate securities. For the year ended December 31, 2012, net cash used in investing activities was $26.8 million related to our investment in equipment, building improvements at our new headquarters located in San Jose, California and net purchases of short-term investments, partially offset by proceeds from the redemption of auction-rate securities.

For the year ended December 31, 2014, net cash used in financing activities was $39.2 million, primarily reflecting $41.2 million used in repurchases of our common stock pursuant to our stock repurchase program and $11.7 million used to pay dividends to our stockholders and dividend equivalents to our employees who hold restricted stock units (“RSUs”), partially offset by $14.0 million of cash proceeds from stock option exercises and issuance of shares through our employee stock purchase plan. For the year ended December 31, 2013, net cash provided by financing activities was $18.9 million, primarily reflecting $40.0 million of cash proceeds from stock option exercises and issuance of shares through our employee stock purchase plan, partially offset by $20.6 million used in repurchases of our common stock pursuant to our stock repurchase program. For the year ended December 31, 2012, net cash used in financing activities was $19.6 million, primarily reflecting the $35.7 million cash dividends paid to stockholders on December 28, 2012, partially offset by $15.2 million of cash proceeds from stock option exercises and issuance of shares through our employee stock purchase plan.

In July 2013, our Board of Directors approved a stock repurchase program that authorizes us to repurchase up to $100 million in the aggregate of our common stock through June 30, 2015. All shares are retired upon repurchase. For the year ended December 31, 2014, we repurchased a total of 1.1 million shares for $41.2 million, at an average price of $39.19 per share. For the year ended December 31, 2013, we repurchased a total of 0.7 million shares for $20.6 million, at an average price of $31.06 per share. As of December 31, 2014, $38.2 million remained available for future repurchases under the program.

In June 2014, our Board of Directors approved a dividend program pursuant to which we intend to pay quarterly cash dividends on our common stock. In addition, RSU awards contain rights to receive dividend equivalents, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. Dividend equivalents accrued on the RSUs are forfeited if the employees do not fulfill their service requirement during the vesting periods. For the year ended December 31, 2014, we paid dividends and dividend equivalents totaling $11.7 million. In addition, our Board of Directors authorized dividend payments totaling $5.8 million to stockholders of record on December 31, 2014, which will be paid on January 15, 2015.

Although cash requirements will fluctuate based on the timing and extent of many factors such as those discussed above, we believe that cash generated from operations, together with the liquidity provided by existing cash balances and short-term investments, will be sufficient to satisfy our liquidity requirements for the next 12 months. We anticipate the cash used for future dividends, dividend equivalents and the stock repurchase program will come from our current domestic cash and cash generated from ongoing U.S. operations. If cash held by our international subsidiaries is needed for these payments, we may be required to accrue and pay U.S. taxes to repatriate these funds.

In the future, in order to strengthen our financial position, in the event of unforeseen circumstances, or in the event we need to fund our growth in future financial periods, we may need to raise additional funds by any one or a combination of the following: issuing equity securities, issuing debt or convertible debt securities, incurring indebtedness secured by our assets, or selling certain product lines and/or portions of our business. There can be no guarantee that we will be able to raise additional funds on terms acceptable to us, or at all.

From time to time, we have engaged in discussions with third parties concerning potential acquisitions of product lines, technologies, businesses and companies, and we continue to consider potential acquisition candidates. Any such transactions could involve the issuance of a significant number of new equity securities, assumptions of debt, and/or payment of cash consideration.  We may also be required to raise additional funds to complete any such acquisition, through either the issuance of equity and debt securities or incurring indebtedness secured by our assets. If we raise additional funds or acquire businesses or technologies through the issuance of equity securities or convertible debt securities, our existing stockholders may experience significant dilution. 

36

Contractual Obligations 

The following table summarizes our contractual obligations at December 31, 2014 (in thousands):

			Payment Due by Period
	Total		Less Than 1 Year		1 - 3 Years		3 - 5 Years		More Than 5 years
Operating leases	$	2,322	$	1,094	$	1,060	$	130	$	38
Outstanding purchase commitments (1)		44,203		42,123		480		300		1,300
Other long-term obligations (2)		9,965		-		4,283		2,052		3,630
Total	$	56,490	$	43,217	$	5,823	$	2,482	$	4,968

______________

(1) Outstanding purchase commitments primarily consist of wafer purchases from our foundries, assembly services and license arrangements.

(2) Other long-term obligations include future cash payments to satisfy long-term liabilities reflected in our Consolidated Balance Sheets, which primarily consist of employee deferred compensation plan liabilities, contingent consideration related to the Sensima acquisition, and accrued dividend equivalents. Because of the uncertainty as to the timing of distributions related to a portion of the employee deferred compensation plan liabilities, we have excluded estimated obligations of $0.2 million from the table above. In addition, because of the uncertainty as to the timing of payments related to our liabilities for unrecognized tax benefits, we have excluded estimated obligations of $5.3 million from the table above.

Off Balance Sheet Arrangements

As of December 31, 2014, we had no off-balance sheet arrangements as defined in Item 303(a)(4) of the Securities and Exchange Commission’s Regulation S-K.

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

Our cash equivalents and investments are subject to market risk, primarily interest rate and credit risk. Our investments are managed by outside professional managers within investment guidelines set by us. Such guidelines include security type, credit quality and maturity and are intended to limit market risk by restricting our investments to high quality debt instruments with relatively short-term maturities. Fluctuations in interest rates of 10% would not have a material impact on our results of operations.

 We do not use derivative financial instruments in our investment portfolio. Investments in debt securities are classified as available-for-sale. For available-for-sale investments, no gains or losses are recognized by us in our results of operations due to changes in interest rates unless such securities are sold prior to maturity or are determined to be other-than-temporarily impaired. Available-for-sale investments are reported at fair value with the related unrealized gains or losses being included in accumulated other comprehensive income, a component of stockholders’ equity.

Long-Term Investments

As of December 31, 2014, all of our holdings in auction rate securities, which have a face value of $5.6 million, have failed to reset as a result of current market conditions. Should these auctions continue to fail and if the credit rating for these securities decline, a 10% decline in the fair value could impact our results of operations by approximately $0.5 million.

Foreign Currency Exchange Risk

Our sales outside the United States are primarily transacted in U.S. dollars. Accordingly, our sales are not generally impacted by foreign currency rate changes. The functional currency of the Company’s offshore operations is the local currency, primarily the Renminbi, the New Taiwan Dollar and the Euro. In addition, we incur foreign currency exchange gains or losses related to the timing of payments for transactions between the U.S. and our foreign subsidiaries, which are reported in interest and other income. To date, fluctuations in foreign currency exchange rates have not had a material impact on our results of operations.

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ITEM 8.     FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED FINANCIAL STATEMENTS

Contents

	Page
Report of Independent Registered Public Accounting Firm	39
Consolidated Balance Sheets	40
Consolidated Statements of Operations	41
Consolidated Statements of Comprehensive Income	42
Consolidated Statements of Stockholders’ Equity	43
Consolidated Statements of Cash Flows	44
Notes to Consolidated Financial Statements	45

38

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Monolithic Power Systems, Inc.

San Jose, California

We have audited the accompanying consolidated balance sheets of Monolithic Power Systems, Inc. and subsidiaries (the "Company") as of December 31, 2014 and 2013, and the related consolidated statements of operations, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2014. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of Monolithic Power Systems, Inc. and subsidiaries as of December 31, 2014 and 2013, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2014, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2014, based on the criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated March 2, 2015 expressed an unqualified opinion on the Company's internal control over financial reporting.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

March 2, 2015

39

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except par value)

	December 31,		December 31,
	2014		2013
ASSETS
Current assets:
Cash and cash equivalents	$	126,266	$	101,213
Short-term investments		112,452		125,126
Accounts receivable, net		25,630		23,730
Inventories		40,918		39,737
Prepaid expenses and other current assets		2,880		2,280
Total current assets		308,146		292,086
Property and equipment, net		62,942		64,837
Long-term investments		5,389		9,860
Goodwill		6,571		-
Acquisition-related intangible assets, net		6,812		-
Deferred tax assets, net		1,049		481
Other long-term assets		8,457		1,644
Total assets	$	399,366	$	368,908
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	13,138	$	10,694
Accrued compensation and related benefits		9,020		10,419
Accrued liabilities		14,703		17,376
Total current liabilities		36,861		38,489
Deferred tax and other tax liabilities		5,876		5,542
Other long-term liabilities		10,204		1,478
Total liabilities		52,941		45,509
Commitments and contingencies (notes 11, 12 and 13)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized:  150,000; shares issued and outstanding: 38,832 and 38,291 as of December 31, 2014 and December 31, 2013, respectively		240,500		234,201
Retained earnings		100,114		82,938
Accumulated other comprehensive income		5,811		6,260
Total stockholders’ equity		346,425		323,399
Total liabilities and stockholders’ equity	$	399,366	$	368,908

See accompanying notes to consolidated financial statements.

40

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

	Year Ended December 31,
	2014			2013			2012
Revenue	$	282,535		$	238,091		$	213,813
Cost of revenue		129,917			110,190			100,665
Gross profit		152,618			127,901			113,148
Operating expenses:
Research and development		58,590			49,733			48,796
Selling, general and administrative		66,755			54,624			50,018
Litigation benefit, net		(8,027	)		(371	)		(2,945	)
Total operating expenses		117,318			103,986			95,869
Income from operations		35,300			23,915			17,279
Interest and other income, net		1,092			92			611
Income before income taxes		36,392			24,007			17,890
Income tax provision		897			1,109			2,134
Net income	$	35,495		$	22,898		$	15,756
Net income per share:
Basic	$	0.92		$	0.61		$	0.45
Diluted	$	0.89		$	0.59		$	0.43
Weighted-average shares outstanding:
Basic		38,686			37,387			34,871
Diluted		39,793			38,620			36,247
Cash dividends declared per common share	$	0.45		$	-		$	1.00

See accompanying notes to consolidated financial statements.

41

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	Year Ended December 31,
	2014			2013			2012
Net income	$	35,495		$	22,898		$	15,756
Other comprehensive income (loss), net of tax:
Change in unrealized losses on auction-rate securities, net of $0 tax in 2014, 2013 and 2012		179			130			140
Change in unrealized gains/losses on other available-for-sale securities, net of $0 tax in 2014, 2013 and 2012		(19	)		(33	)		34
Foreign currency translation adjustments		(609	)		1,988			408
Total other comprehensive income (loss), net of tax		(449	)		2,085			582
Comprehensive income	$	35,046		$	24,983		$	16,338

See accompanying notes to consolidated financial statements.

42

MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

										Accumulated
										Other			Total
	Common Stock						Retained			Comprehensive			Stockholders’
	Shares			Amount			Earnings			Income			Equity
Balance as of January 1, 2012		33,826		$	159,336		$	79,948		$	3,593		$	242,877
Net income		-			-			15,756			-			15,756
Other comprehensive income		-			-			-			582			582
Dividends declared		-			-			(35,664	)		-			(35,664	)
Exercise of stock options and related tax benefits		1,152			14,232			-			-			14,232
Shares issued under the employee stock purchase plan		152			1,852			-			-			1,852
Stock-based compensation expense		-			18,659			-			-			18,659
Release of restricted stock		543			-			-			-			-
Balance as of December 31, 2012		35,673			194,079			60,040			4,175			258,294
Net income		-			-			22,898			-			22,898
Other comprehensive income		-			-			-			2,085			2,085
Exercise of stock options and related tax benefits		2,446			37,877			-			-			37,877
Repurchase of common shares		(664	)		(20,615	)		-			-			(20,615	)
Shares issued under the employee stock purchase plan		111			2,145			-			-			2,145
Stock-based compensation expense		-			20,715			-			-			20,715
Release of restricted stock		725			-			-			-			-
Balance as of December 31, 2013		38,291			234,201			82,938			6,260			323,399
Net income		-			-			35,495			-			35,495
Other comprehensive loss		-			-			-			(449	)		(449	)
Dividends and dividend equivalents declared		-			-			(18,319	)		-			(18,319	)
Exercise of stock options and related tax benefits		742			11,960			-			-			11,960
Repurchase of common shares		(1,051	)		(41,198	)		-			-			(41,198	)
Shares issued under the employee stock purchase plan		78			2,078			-			-			2,078
Stock-based compensation expense		-			33,459			-			-			33,459
Release of restricted stock		772			-			-			-			-
Balance as of December 31, 2014		38,832		$	240,500		$	100,114		$	5,811		$	346,425

See accompanying notes to consolidated financial statements.

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MONOLITHIC POWER SYSTEMS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2014			2013			2012
Cash flows from operating activities:
Net income	$	35,495		$	22,898		$	15,756
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of tangible and intangible assets		13,130			12,160			9,332
Loss on disposal of property and equipment		-			31			81
Amortization and realized gains/losses on investments		96			443			214
Deferred taxes, net		17			(81	)		(8	)
Excess tax benefit from equity awards		(10	)		-			(869	)
Stock-based compensation		33,454			20,701			18,652
Changes in operating assets and liabilities, net of effects of an acquisition:
Accounts receivable		(1,870	)		(4,347	)		(4,286	)
Inventories		(1,142	)		(7,606	)		(12,004	)
Prepaid expenses and other assets		(2,029	)		121			(456	)
Accounts payable		1,632			1,440			754
Accrued liabilities		(3,102	)		12,149			(2,097	)
Tax liabilities		(248	)		86			1,476
Accrued compensation and related benefits		(1,290	)		2,691			(1,633	)
Net cash provided by operating activities		74,133			60,686			24,912
Cash flows from investing activities:
Property and equipment purchases		(9,511	)		(15,764	)		(21,059	)
Proceeds from sale of property and equipment		-			88			13
Purchases of short-term investments		(136,872	)		(125,756	)		(143,094	)
Proceeds from sale of short-term investments		149,291			85,700			135,183
Proceeds from sale of long-term investments		4,650			2,025			2,100
Premiums paid on deferred compensation plan		(5,335	)		(617	)		-
Change in restricted assets		-			-			20
Cash paid for an acquisition, net of cash acquired		(11,590	)		-			-
Net cash used in investing activities		(9,367	)		(54,324	)		(26,837	)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms		(400	)		(557	)		-
Proceeds from exercise of stock options		11,941			37,877			13,390
Proceeds from shares issued under the employee stock purchase plan		2,078			2,145			1,852
Repurchases of common shares		(41,198	)		(20,615	)		-
Dividends and dividend equivalents paid		(11,658	)		-			(35,664	)
Excess tax benefits from equity awards		10			-			869
Net cash provided by (used in) financing activities		(39,227	)		18,850			(19,553	)
Effect of change in exchange rates		(486	)		897			211
Net increase (decrease) in cash and cash equivalents		25,053			26,109			(21,267	)
Cash and cash equivalents, beginning of period		101,213			75,104			96,371
Cash and cash equivalents, end of period	$	126,266		$	101,213		$	75,104
Supplemental disclosures for cash flow information:
Cash paid for taxes	$	1,235		$	1,116		$	807
Supplemental disclosures of non-cash investing and financing activities:
Liability accrued for property and equipment purchases	$	1,487		$	1,941		$	1,728
Liability accrued for dividends and dividend equivalents	$	6,660		$	-		$	-
Fair value of contingent consideration related to an acquisition	$	2,507		$	-		$	-

See accompanying notes to consolidated financial statements.

44

MONOLITHIC POWER SYSTEMS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business

Monolithic Power Systems, Inc. (“MPS” or the “Company”) was incorporated in the State of California on August 22, 1997. On November 17, 2004, the Company was reincorporated in the State of Delaware. MPS designs, develops and markets integrated power semiconductor solutions and power delivery architectures. MPS's mission is to provide innovative power solutions in cloud computing, telecommunications, industrial and automotive, and consumer market segments.

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of stock-based awards, valuation of goodwill and acquisition-related intangible assets, contingencies and tax valuation allowances. Actual results could differ from those estimates.

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash consists of checking and savings accounts. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments consist primarily of certificates of deposit and government agencies and treasuries and the long-term investments consist of government-backed student loan auction-rate securities. The Company generally does not require its customers to provide collateral or other security to support accounts receivable. To manage credit risk, management performs ongoing credit evaluations of its customers’ financial condition.  The Company requires cash in advance for certain customers in addition to ongoing credit evaluations for those where credit has been extended. Accounts receivable allowances were not material in any periods presented.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company; changes in third-party manufacturers; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in domestic and international economic and/or political regulations; availability of necessary components or subassemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

Foreign Currency  

The functional currency of the Company’s international subsidiaries is primarily the local currency. The majority of the subsidiaries is located in China and Taiwan, which utilize the Renminbi and the New Taiwan Dollar as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are presented as a separate component of accumulated other comprehensive income in stockholders’ equity in the Consolidated Balance Sheets. In addition, the Company incurs foreign currency exchange gains or losses related to the timing of payments for transactions between the U.S. and its subsidiaries. Foreign currency transaction gains (losses) are reported in interest and other income, net, in the Consolidated Statements of Operations and totaled $0.1 million, $(0.6) million and $(0.1) million for the years ended December 31, 2014, 2013 and 2012, respectively.

45

Cash and Cash Equivalents 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents.

Fair Value of Financial Instruments

Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1: Quoted prices in active markets for identical assets

Level 2: Significant other observable inputs

Level 3: Significant unobservable inputs

The Company’s financial instruments include cash and cash equivalents, short-term and long-term investments. Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term investments are classified as available-for-sale securities and are stated at their fair market value.

The Company determines whether an impairment is temporary or other-than temporary. Unrealized gains or losses that are deemed to be temporary are recorded as a component of accumulated other comprehensive income in stockholder’s equity in the Consolidated Balance Sheets, and changes in unrealized gains or losses are recorded in the Consolidated Statements of Comprehensive Income. The Company records an impairment charge in interest and other income, net, in the Consolidated Statements of Operations when an available-for-sale investment has experienced a decline in value that is deemed to be other-than-temporary. Other-than-temporary impairment exists when the Company either has the intent to sell the security, it will more likely than not be required to sell the security before anticipated recovery, or it does not expect to recover the entire amortized cost basis of the security.

At December 31, 2014, the fair value of the Company’s holdings in auction-rate securities was $5.4 million, all of which was classified as long-term available-for-sale investments. The valuation of the auction-rate securities is subject to fluctuations in the future, which will depend on many factors, including the quality of the underlying collateral, estimated time to liquidity including potential to be called or restructured, underlying final maturity, insurance guaranty and market conditions, among others.

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) or current market value. The Company writes down excess and obsolete inventory based on its age and forecasted demand, which includes estimates taking into consideration the Company’s outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand and such differences may have a material effect on recorded inventory values. Inventory write-downs are not reversed until the related inventories have been sold.

Property and Equipment

Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have a depreciation life of 30 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful life or the lease period.  Computer, software and equipment have a depreciation life of three to seven years. Transportation equipment has a depreciate life of 5 to 15 years. Furniture and fixtures have a depreciation life of three to five years.

Goodwill and Acquisition-Related Intangible Assets

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. In-process research and development (“IPR&D”) assets represent the fair value of incomplete R&D projects that had not reached technological feasibility as of the date of acquisition. The IPR&D assets are initially capitalized at fair value as intangible assets with indefinite lives. When the IPR&D projects are completed, they are reclassified as amortizable intangible assets and are amortized over their estimated useful lives. Alternatively, if the IPR&D projects are abandoned, they are impaired and expensed to research and development.

Acquisition-related intangible assets with finite lives consist of know-how and developed technologies. These assets are amortized on a straight-line basis over estimated useful lives ranging from three to five years and the amortization expense is recorded in cost of revenue in the Consolidated Statements of Operations.

46

Other Long-Term Assets

Other assets primarily consist of intangible assets for the land use rights in Chengdu, China, purchased patents, long-term lease deposits and deferred compensation plan investments. We amortize the land use rights over 50 years and the purchased patents over five years.

Impairment of Long-Lived Assets

The Company evaluates long-lived assets, other than goodwill and acquisition-related intangible assets with indefinite useful lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows.

The Company tests goodwill for impairment at least annually, or whenever events or changes in circumstances indicate that the goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that its fair value is less than the carrying amount, then the two-step goodwill impairment test is performed. The first step compares the fair value of the reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step measures the impairment loss by comparing the implied fair value of the goodwill with the carrying amount. As of December 31, 2014, no impairment of goodwill has been identified. 

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive management, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

The liabilities for compensation deferred under the plan are recorded at fair value in each reporting period and are included in other long-term liabilities in the Consolidated Balance Sheets. Changes in the fair value of the liabilities are recorded as an operating expense (credit) in the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments that offset a substantial portion of the exposure. The investments are recorded in other long-term assets in the Consolidated Balance Sheets at the cash surrender value of the corporate-owned life insurance policies and at the fair value of the mutual fund investments, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund investments are included in interest and other income, net in the Consolidated Statements of Operations. As of December 31, 2014 and 2013, the plan assets totaled $6.1 million and $0.6 million, and the plan liabilities totaled $6.2 million and $0.6 million, respectively.

Warranty Reserves

The Company generally provides a one to two-year warranty against defects in materials and workmanship and will either repair the goods or provide replacement products at no charge to the customer for defective products. Reserve requirements are recorded in the period of sale and are based on an assessment of the products sold with warranty and historical warranty costs incurred. Historically, the warranty expenses have not been material to the Company’s consolidated financial statements. 

Revenue Recognition

The Company recognizes revenue when the following four basic criteria are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Determination of criteria (3) and (4) are based on management’s judgment regarding the fixed nature of the fees charged for products delivered and the collectability of those fees. The application of these criteria has resulted in the Company generally recognizing revenue upon shipment (when title passes) to customers, including distributors, original equipment manufacturers and electronic manufacturing service providers.

47

The Company’s revenue consists primarily of sales of assembled and tested finished goods. The Company also sells die in wafer form to its customers and value-added resellers, and the Company receives royalty revenue from third parties and value-added resellers.

For the years ended December 31, 2014 and 2013, approximately 92% and 91% of the Company’s distributor sales, respectively, including sales to the Company’s value-added resellers, were made through distribution arrangements with third parties. These arrangements do not include any special payment terms (the Company’s normal payment terms are 30-45 days for its distributors), price protection or exchange rights. Returns are limited to the Company’s standard product warranty. Certain of the Company’s large distributors have contracts that include limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases.

For the years ended December 31, 2014 and 2013, approximately 8% and 9% of the Company’s distributor sales, respectively, were made through small distributors primarily based on purchase orders. These distributors typically have no stock rotation rights.

The Company generally recognizes revenue upon shipment of products to the distributors for the following reasons:

(1)	The price is fixed or determinable at the date of sale. The Company does not offer special payment terms, price protection or price adjustments to distributors when the Company recognizes revenue upon shipment.
(2)	The distributors are obligated to pay the Company and this obligation is not contingent on the resale of the Company’s products.
(3)	The distributors’ obligation is unchanged in the event of theft or physical destruction or damage to the products.
(4)	The distributors have stand-alone economic substance apart from the Company’s relationship.
(5)	The Company does not have any obligations for future performance to directly bring about the resale of its products by the distributors.
(6)	The amount of future returns can be reasonably estimated. The Company has the ability and the information necessary to track inventory sold to and held at its distributors. The Company maintains a history of returns and has the ability to estimate the stock rotation returns on a quarterly basis.

The Company maintains a sales reserve for stock rotation rights, which is based on historical experience of actual stock rotation returns on a per distributor basis, where available, and information related to products in the distribution channel. This reserve is recorded at the time of sale. Historically, these returns were not material to the Company’s consolidated financial statements.  

If the Company enters into arrangements that have rights of return that are not estimable, the Company recognizes revenue under such arrangements only after the distributors have sold the products to end customers. Three of the Company’s U.S. distributors have distribution agreements where revenue is recognized upon sale by these distributors to their end customers because these distributors have certain rights of return which management believes are not estimable. The deferred revenue balance from these distributors as of December 31, 2014 and 2013 was $2.0 million and $1.7 million, respectively. The deferred costs as of December 31, 2014 and 2013 were $0.2 million.

Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The Company uses the Black-Scholes model to estimate the fair value of its options and shares issued under employee stock purchase plan. The fair value of time-based and performance-based restricted stock units is based on the grant date share price. The fair value of market-based restricted stock units is estimated using a Monte Carlo simulation model.

The Company recognizes compensation expense equal to the grant-date fair value for all share-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire awards, unless the awards are subject to performance or market conditions, in which case the Company recognizes compensation expense over the requisite service period of each separate vesting tranche. For the performance-based awards, the Company recognizes compensation expense when it becomes probable that the performance criteria set by the Board of Directors will be achieved. For the market-based awards, compensation expense is not reversed if the market condition is not satisfied. The amount of stock-based compensation that the Company recognizes is based on an expected forfeiture rate. If there is a difference between the forfeiture assumptions used in determining stock-based compensation costs and the actual forfeitures which become known over time, the Company may change the forfeiture rate, which could have a significant impact on its stock-based compensation expense.

Research and Development

Costs incurred in research and development are expensed as incurred.

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Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments primarily related to transfer pricing, cost sharing and its international tax structure exposure.

Contingencies

The Company is a party to actions and proceedings incident to its business in the ordinary course of business, including litigation regarding the Company’s intellectual property, challenges to the enforceability or validity of its intellectual property and claims that its products infringe on the intellectual property rights of others. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

Litigation Expense (Benefit)

The Company records litigation costs in the period in which they are incurred. Due to the uncertainties inherent in litigation proceedings, the Company generally recognizes the proceeds resulting from settlement of litigation or favorable judgments when the cash is received and there is no further contingency related to the litigation. The proceeds are recorded as a reduction against litigation expense to the extent that litigation costs were previously incurred in the related case. Proceeds in excess of cumulative costs incurred for the case is recorded in interest and other income, net, in the Consolidated Statements of Operations. Litigation expense (benefit), net, includes primarily patent litigation and other contract-related matters.

Comprehensive Income

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive income presented in the Consolidated Balance Sheets primarily consists of unrealized gains and losses related to available-for-sale investments and foreign currency translation adjustments.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard gives guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists, with the purpose of reducing diversity in practice. This new standard requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. The Company adopted this standard in the first quarter of 2014 prospectively and the adoption did not have an impact on its consolidated financial position, results of operations or cash flows.

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In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Under the new standard, entities will apply the following five-step model when evaluating revenue contracts with customers:

(1) Identify the contract with a customer.

(2) Identify the performance obligations in the contract.

(3) Determine the transaction price.

(4) Allocate the transaction price to the performance obligations in the contract.

(5) Recognize revenue when the entity satisfies a performance obligation.

The new standard is effective for annual and interim reporting periods beginning after December 15, 2016. Entities have the option of using either a full retrospective or a modified retrospective application in the adoption of this standard. The Company will adopt the standard in the first quarter of 2017 and is evaluating the transition method and the impact of the adoption on its consolidated financial position, results of operations and cash flows.

2. ACQUISITION

On July 22, 2014 (the “Acquisition Date”), the Company acquired 100% of the outstanding capital stock of Sensima Technology SA (“Sensima”), a company based in Switzerland that develops magnetic sensor technologies for angle measurements as well as three-dimensional magnetic field sensing. The acquisition is expected to create new opportunities with customers by offering enhanced solutions in power management for key industries such as automotive, industrial and cloud computing. Subsequent to the Acquisition Date, Sensima became a subsidiary of the Company and its results of operations have been included in the Company’s consolidated financial statements.

Purchase Consideration

The fair value of the purchase consideration consists of the following (in thousands):

Cash paid at the Acquisition Date	$	11,735
Contingent consideration		2,507
Total	$	14,242

Cash paid at the Acquisition Date included $1.2 million that is being held in an escrow account for a one-year period, which is subject to Sensima’s satisfaction of certain representations and warranties.

The contingent consideration arrangement requires the Company to pay up to an additional $8.9 million to former Sensima shareholders if Sensima achieves a new product introduction as well as certain product revenue and direct margin targets in 2016. The fair value of the contingent consideration at the Acquisition Date was $2.5 million, which was estimated based on a probability-weighted analysis of possible future cash flow outcomes. The fair value of the contingent consideration is recorded in other long-term liabilities in the Consolidated Balance Sheets and is remeasured at the end of each reporting period, with any changes in fair value recorded in operating expense in the Consolidated Statements of Operations. Actual amounts that will ultimately be paid may differ from the obligations recorded.

The Company incurred $0.6 million of transaction costs that were expensed as incurred and included in selling, general and administrative expenses in the Consolidated Statements of Operations.

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Preliminary Purchase Consideration Allocation

The estimated fair value of assets acquired and liabilities assumed is as follows (in thousands):

Cash	$	145
Other tangible assets acquired, net of liabilities assumed		42
Intangible assets:
Know-how		1,018
Developed technologies		4,421
IPR&D		2,045
Total identifiable net assets acquired		7,671
Goodwill		6,571
Total net assets acquired	$	14,242

Intangible assets with finite lives include know-how and developed technologies with estimated useful lives of three to five years. The fair value of know-how was determined using the relief from royalty method, and the fair value of the developed technologies was determined using the income approach. Intangible assets with indefinite lives include IPR&D, which consists of incomplete R&D projects that had not reached technological feasibility as of the Acquisition Date. The fair value of the IPR&D assets was determined using the income approach.

The goodwill arising from the acquisition was primarily attributed to synergies which will enable the Company to develop advanced solutions in power management by combining with Sensima’s magnetic sensor technologies. The goodwill is not expected to be deductible for tax purposes.

The purchase price allocation is considered preliminary and dependent upon the finalization of the valuation of assets acquired and liabilities assumed, primarily related to deferred taxes. The Company is currently determining if the acquisition qualifies as a tax-free reorganization within the meaning of Swiss tax rules pursuant to the tax holiday granted to Sensima by the Swiss tax authorities. Final determination of the valuation could result in an adjustment to the preliminary purchase price allocation, with an offsetting adjustment to goodwill.

Equity Awards

On the Acquisition Date, the Board of Directors granted $1.7 million of time-based RSUs (or 40,000 shares) to key Sensima employees who became employees of the Company. These awards vest over four years. In addition, the Board of Directors granted $2.0 million of PSUs (or 47,000 shares) to these employees, with the right to earn up to a maximum of $8.0 million based on the achievement of certain cumulative Sensima product revenue targets during the performance period from the Acquisition Date to July 22, 2019. One half of the awards subject to each revenue goal will vest immediately when the pre-determined revenue goal is met and approved by the Compensation Committee, and the remaining 50% will vest over the following two years. The vesting is subject to the employees’ continued employment with the Company. These equity awards are considered arrangements for post-acquisition services and the related compensation expense is being recognized over the requisite service period.

Pro Forma Information (Unaudited)

Supplemental information of the Company’s results of operations on a pro forma basis, as if the Sensima acquisition had been consummated on January 1, 2013, is presented as follows (in thousands, except per-share amounts):

	Year Ended December 31,
	2014		2013
Revenue	$	282,584	$	238,181
Net income	$	33,777	$	20,187
Diluted net income per share	$	0.85	$	0.52

These pro forma results are not necessarily indicative of the Company’s consolidated results of operations in future periods or the results that would have been realized had the Company acquired Sensima during the periods presented. The pro forma results include adjustments primarily related to Sensima’s results of operations, amortization of intangible assets, stock-based compensation expense and the related tax effects.

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3.  CASH, CASH EQUIVALENTS AND INVESTMENTS

The following is a summary of the Company’s cash, cash equivalents, and short-term and long-term investments (in thousands):

	As of December 31,
	2014		2013
Cash, cash equivalents and investments:
Cash	$	66,188	$	62,625
Money market funds		60,078		35,588
Certificates of deposit		22,778		-
U.S. treasuries and government agency bonds		89,674		128,126
Auction-rate securities backed by student-loan notes		5,389		9,860
Total	$	244,107	$	236,199

	As of December 31,
	2014		2013
Reported as:
Cash and cash equivalents	$	126,266	$	101,213
Short-term investments		112,452		125,126
Long-term investments		5,389		9,860
Total	$	244,107	$	236,199

The contractual maturities of the Company’s short-term and long-term available-for-sale investments are as follows (in thousands):

	As of December 31,
	2014		2013
Due in less than 1 year	$	91,335	$	95,509
Due in 1 - 5 years		21,117		29,617
Due in greater than 5 years		5,389		9,860
Total	$	117,841	$	134,986

The following tables summarize unrealized gains and losses related to the Company's investments in marketable securities designated as available-for sale (in thousands):

	As of December 31, 2014
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	60,078	$	-	$	-		$	60,078	$	-
Certificates of deposit		22,778		-		-			22,778		-
U.S. treasuries and government agency bonds		89,689		14		(29	)		89,674		35,062
Auction-rate securities backed by student-loan notes		5,570		-		(181	)		5,389		5,389
Total	$	178,115	$	14	$	(210	)	$	177,919	$	40,451

	As of December 31, 2013
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	35,588	$	-	$	-		$	35,588	$	-
U.S. treasuries and government agency bonds		128,123		26		(23	)		128,126		42,880
Auction-rate securities backed by student-loan notes		10,220		-		(360	)		9,860		9,860
Total	$	173,931	$	26	$	(383	)	$	173,574	$	52,740

For the years ended December 31, 2014 and 2013, the Company redeemed $4.7 million and $2.0 million, respectively, of auction-rate securities at par. The underlying maturities of the outstanding auction-rate securities are up to 33 years. As of December 31, 2014 and 2013, the impairment was determined to be temporary based on the following management assessment:

(1) The decline in the fair value of these securities is not largely attributable to adverse conditions specifically related to these securities or to specific conditions in an industry or in a geographic area;

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(2)	Management possesses both the intent and ability to hold these securities for a period of time sufficient to allow for any anticipated recovery in fair value;
(3)	Management believes that it is more likely than not that the Company will not have to sell these securities before recovery of its cost basis;
(4)	Except for the credit loss of $70,000 recognized in the year ended December 31, 2009, the Company does not believe that there is any additional credit loss associated with these securities because the Company expects to recover the entire amortized cost basis;
(5)	There have been no further downgrades on these securities since 2009;
(6)	All scheduled interest payments have been made pursuant to the reset terms and conditions; and
(7)	All redemptions of these securities to date, representing 87% of the original portfolio, have been at par.

4. FAIR VALUE MEASUREMENT

The following table details the fair value measurement of the financial assets and liabilities (in thousands):

	Fair Value Measurement at December 31, 2014
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	60,078	$	60,078	$	-	$	-
Certificates of deposit		22,778		-		22,778		-
U.S. treasuries and government agency bonds		89,674		-		89,674		-
Auction-rate securities backed by student-loan notes		5,389		-		-		5,389
Mutual funds under deferred compensation plan		2,236		2,236		-		-
Total	$	180,155	$	62,314	$	112,452	$	5,389
Liabilities:
Contingent consideration	$	2,507	$	-	$	-	$	2,507
Total	$	2,507	$	-	$	-	$	2,507

	Fair Value Measurement at December 31, 2013
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	35,588	$	35,588	$	-	$	-
U.S. treasuries and government agency bonds		128,126		-		128,126		-
Auction-rate securities backed by student-loan notes		9,860		-		-		9,860
Total	$	173,574	$	35,588	$	128,126	$	9,860

The Company’s level 3 assets consist of government-backed student loan auction-rate securities, with interest rates that reset through a Dutch auction every 7 to 35 days and which became illiquid in 2008. The following table provides a rollforward of the fair value of the auction-rate securities (in thousands):

Balance at January 1, 2013	$	11,755
Sales and settlement at par		(2,025	)
Change in unrealized loss included in other comprehensive income		130
Ending balance at December 31, 2013		9,860
Sales and settlement at par		(4,650	)
Change in unrealized loss included in other comprehensive income		179
Ending balance at December 31, 2014	$	5,389

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The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions:

	As of December 31,
	2014		2013
Time-to-liquidity (months)		24		24
Expected return		2.9%		2.5%
Discount rate		4.0% - 7.0%		3.3% - 8.1%

The Company’s level 3 liabilities consist of the contingent consideration related to the acquisition of Sensima in July 2014. The arrangement requires the Company to pay up to $8.9 million to certain former Sensima shareholders if Sensima achieves a new product introduction as well as certain product revenue and direct margin targets in 2016. The fair value of the contingent consideration at the Acquisition Date was $2.5 million, which was estimated based on a probability-weighted analysis of possible future cash flow outcomes. There were no significant changes in the fair value of the contingent consideration from the Acquisition Date to December 31, 2014. The fair value is calculated using the following assumptions:

	As of December 31,
	2014
Project revenue in 2016 (in millions)		$2.1 - $3.8
Discount rate		9.0%
Probability of occurrence		20% - 50%

5. BALANCE SHEET COMPONENTS

Inventories 

Inventories consist of the following (in thousands):

	As of December 31,
	2014		2013
Raw materials	$	7,298	$	12,453
Work in process		18,950		14,152
Finished goods		14,670		13,132
Total	$	40,918	$	39,737

Property and Equipment, Net

Property and equipment, net, consist of the following (in thousands):

	As of December 31,
	2014			2013
Production equipment and software	$	88,929		$	83,075
Buildings and improvements		29,386			29,342
Land		5,600			5,600
Transportation equipment		4,694			976
Furniture and fixtures		2,883			2,681
Leasehold improvements		2,350			2,150
Property and equipment, gross		133,842			123,824
Less: accumulated depreciation and amortization		(70,900	)		(58,987	)
Total	$	62,942		$	64,837

Depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012 was $12.4 million, $12.1 million and $9.3 million, respectively.

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Other Long-Term Assets

Other long-term assets consist of the following (in thousands):

 

	As of December 31,
	2014		2013
Deferred compensation plan assets	$	6,084	$	607
Prepaid expense		1,418		57
Other		955		980
Total	$	8,457	$	1,644

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	As of December 31,
	2014		2013
Deferred proceeds from litigation	$	-	$	9,489
Dividends and dividend equivalents		6,080		-
Deferred revenue and customer prepayments		3,908		2,523
Stock rotation reserve		1,757		1,459
Commissions		767		931
Sales rebate		586		900
Warranty		240		451
Other		1,365		1,623
Total	$	14,703	$	17,376

Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

	As of December 31,
	2014		2013
Deferred compensation plan liabilities	$	6,177	$	628
Contingent consideration		2,507		-
Dividend equivalents		580		-
Other		940		850
Total	$	10,204	$	1,478

6. GOODWILL AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET

There have been no changes in the balance of goodwill from the Acquisition Date to December 31, 2014. The Company did not identify any goodwill impairment in 2014.

Acquisition-related intangible assets consist of the following (in thousands):

	As of December 31, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Subject to amortization:
Know-how	$	1,018	$	(93	)	$	925
Developed technologies		4,421		(579	)		3,842
Not subject to amortization:
IPR&D		2,045		-			2,045
Total	$	7,484	$	(672	)	$	6,812

Amortization expense was recorded in cost of revenue in the Consolidated Statements of Operations and totaled $0.7 million for the year ended December 31, 2014.

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The estimated future amortization expense as of December 31, 2014 is as follows (in thousands):

2015	$	1,467
2016		1,467
2017		1,467
2018 and thereafter		366
Total	$	4,767

7.  STOCK-BASED COMPENSATION

2004 Equity Incentive Plan (the “2004 Plan”)

The Board of Directors adopted the 2004 Plan in March 2004, and the stockholders approved it in November 2004. The 2004 Plan provided for annual increases in the number of shares available for issuance equal to the least of 5% of the outstanding shares of common stock on the first day of the year, 2.4 million shares, or a number of shares determined by the Board of Directors. The 2004 Plan expired on November 12, 2014 and equity awards can no longer be granted under the 2004 Plan. As of November 12, 2014, 2.9 million shares that were available for issuance expired under the 2004 Plan.

2014 Equity Incentive Plan (the “2014 Plan”)

The Board of Directors adopted the 2014 Plan in April 2013, and the stockholders approved it in June 2013. The 2014 Plan became effective on November 13, 2014. The 2014 Plan provides for the issuance of up to 5.5 million shares and will expire on November 13, 2024. As of December 31, 2014, 5.5 million shares remained available for future issuance.

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Year Ended December 31,
	2014		2013		2012
Cost of revenue	$	903	$	631	$	510
Research and development		9,019		6,219		6,922
Selling, general and administrative		23,532		13,851		11,220
Tax benefit		-		-		(187	)
Total	$	33,454	$	20,701	$	18,465

Equity Award Modifications

In connection with a special cash dividend declared and paid in December 2012, the Board of Directors approved an equity award modification whereby the number of shares of each option outstanding as of December 28, 2012 was increased by a ratio of 1.0471 and the exercise price was reduced by the same ratio. Consequently, the Company granted an additional 171,000 shares. This modification was permissible pursuant to the Company’s 2004 Plan and resulted in an incremental compensation cost of $2.9 million, of which $2.8 million was recognized during the fourth quarter of 2012. The remaining $0.1 million is being recognized over the remaining vesting period of the awards. The Company used the Black-Scholes model to determine the fair value of the additional option awards with the following weighted-average assumptions: expected term of 1.9 years, expected volatility of 41.0%, risk-free interest rate of 0.3% and dividend yield of 0.0%.

In addition, in connection with the special cash dividend, the Board of Directors approved an equity award modification whereby for each unvested restricted stock unit (“RSU”) as of December 28, 2012, the holder would receive 1.0471 shares upon vesting of the original awards granted. Consequently, the Company granted an additional 74,000 shares. This modification was permissible pursuant to the Company’s 2004 Plan and resulted in an incremental compensation cost of $1.5 million, which is being recognized over the remaining vesting period of the awards. The fair value of the additional RSUs was based on the grant date share price.

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RSUs

The Company’s RSUs include time-based RSUs, performance-based RSUs (“PSUs”) and market-based RSUs (“MSUs”). A summary of the RSUs is presented in the table below:

	Time-Based RSUs			Weighted- Average Grant Date Fair Value Per Share		PSUs			Weighted- Average Grant Date Fair Value Per Share		MSUs		Weighted- Average Grant Date Fair Value Per Share		Total			Weighted- Average Grant Date Fair Value Per Share
	(in thousands)					(in thousands)					(in thousands)				(in thousands)
Outstanding at January 1, 2012		1,082		$	16.00		217		$	20.73		-	$	-		1,299		$	16.87
Modification (1)		(76	)	$	15.69		76		$	15.69		-	$	-		-		$	-
Granted (2)(3)		617		$	18.69		963		$	18.24		-	$	-		1,580		$	18.42
Performance adjustment (4)		-		$	-		(624	)	$	18.19		-	$	-		(624	)	$	18.19
Released		(447	)	$	17.30		(97	)	$	20.73		-	$	-		(544	)	$	17.91
Forfeited		(77	)	$	16.61		(4	)	$	19.07		-	$	-		(81	)	$	16.74
Outstanding at December 31, 2012		1,099		$	16.96		531		$	18.49		-	$	-		1,630		$	17.46
Granted (3)		299		$	24.25		875		$	24.43		1,800	$	23.57		2,974		$	23.89
Performance adjustment (4)		-		$	-		(124	)	$	21.98		-	$	-		(124	)	$	21.98
Released		(519	)	$	17.57		(206	)	$	18.90		-	$	-		(725	)	$	17.95
Forfeited		(125	)	$	17.06		(48	)	$	19.06		-	$	-		(173	)	$	17.61
Outstanding at December 31, 2013		754		$	19.41		1,028		$	23.02		1,800	$	23.57		3,582		$	22.53
Granted (3)(5)		335		$	36.71		1,091		$	34.23		-	$	-		1,426		$	34.82
Performance adjustment (4)		-		$	-		(139	)	$	31.40		-	$	-		(139	)	$	31.40
Released		(468	)	$	20.36		(304	)	$	18.12		-	$	-		(772	)	$	19.48
Forfeited		(32	)	$	19.75		(17	)	$	19.79		-	$	-		(49	)	$	19.77
Outstanding at December 31, 2014		589		$	28.48		1,659		$	28.11		1,800	$	23.57		4,048		$	26.14

 _________________

(1) See “2011 and 2012 CEO Awards” below for further discussion.

(2) Amount includes 74,000 shares granted as a result of the equity award modification. See “Equity Award Modifications” above for further discussion.

(3) Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.

(4) Amount reflects the number of PSUs that have not been earned or may not be earned based on management’s probability assessment.

(5) Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See “2014 Time-Based RSUs and PSUs” below for further discussion.

The intrinsic value related to awards released for the years ended December 31, 2014, 2013 and 2012 was $28.9 million, $18.6 million and $10.5 million, respectively. As of December 31, 2014, the total intrinsic value of outstanding awards was $201.3 million, based on the closing stock price of $49.74. As of December 31, 2014, unamortized compensation expense related to outstanding awards was approximately $73.6 million with a weighted-average remaining recognition period of approximately six years.

2014 Time-Based RSUs and PSUs:

In February 2014, the Board of Directors granted 336,000 shares to executive officers. These grants included 84,000 shares of time-based RSUs which vest over two years on a quarterly basis, and 252,000 shares of PSUs which represent a target number of RSUs to be awarded based on the Company’s achievement of an average two-year (2014 and 2015) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as determined by the Semiconductor Industry Association (“2014 Executive PSUs”). The maximum number of 2014 Executive PSUs that an executive officer can ultimately earn is 300% of the target shares. Half of the 2014 Executive PSUs will vest in February 2016 if the pre-determined performance goals are met and approved by the Compensation Committee. The remaining shares will vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In April 2014, the Board of Directors granted 139,000 shares to non-executive employees. These grants included 78,000 shares of time-based RSUs which vest over four years on an annual or quarterly basis, and 61,000 shares of PSUs which represent a target number of RSUs to be awarded based on the Company’s achievement of 2015 revenue goals for certain regions or product line divisions, or the Company’s achievement of an average two-year (2014 and 2015) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as determined by the Semiconductor Industry Association (“2014 Non-Executive PSUs”). The maximum number of 2014 Non-Executive PSUs that an employee can ultimately earn is either 200% or 300% of the target shares, depending on the job classifications of the employees. Half of the 2014 Non-Executive PSUs will vest in the second quarter of 2016 if the pre-determined performance goals are met and approved by the Compensation Committee. The remaining shares will vest over the following two years on an annual or quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In connection with the acquisition of Sensima in July 2014, the Board of Directors granted time-based RSUs and PSUs to key Sensima employees who became employees of the Company. See Note 2 for further discussion.

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In October 2014, the Board of Directors approved 212,000 shares of PSUs to executive officers with a two-year performance period that will begin in 2015.  In addition, the Board of Directors approved 358,000 shares of PSUs to non-executive employees with five consecutive two-year performance periods that will begin in 2015 and end in 2020.  The performance metrics for all of the PSUs will be defined by the Board of Directors at the inception of each performance period. The shares were reserved from the 2004 Plan prior to its expiration in November 2014. The shares will be subject to adjustments at the discretion of the Board of Directors at the inception of each performance period. The Company will determine the grant date fair value of these awards and begin recognizing the related expense when the performance metrics are approved by the Board of Directors and the awards are communicated to the employees at the inception of each performance period.

In October 2014, the Board of Directors approved 104,000 shares of time-based RSUs to non-executive employees with vesting period that will begin in 2015. The shares were reserved from the 2004 Plan prior to its expiration in November 2014.  The Company will determine the grant date fair value of these awards and begin recognizing the related expense when the awards are communicated to the employees in 2015.

2013 MSUs:

In December 2013, the Board of Directors granted 360,000 shares to the executive officers and certain key employees. The MSUs represent the right to receive a maximum of 1.8 million shares that can be earned upon achievement of five pre-determined MPS stock price hurdles from January 1, 2014 to December 31, 2018 (“2013 MSUs”). The 2013 MSUs that meet the pre-determined stock price hurdles from January 1, 2014 to December 31, 2018 will vest quarterly from January 1, 2019 to December 31, 2023, subject to the employees’ continued employment with the Company. In 2014, the Company achieved three price hurdles, and the Compensation Committee approved an additional 720,000 shares to the employees.

The Company determined the grant date fair value of the 2013 MSUs using a Monte Carlo simulation model with the following assumptions: grant date stock price of $31.73, expected volatility of 38.69%, risk-free interest rate of 1.6% and dividend yield of 0.0%. Stock-based compensation expense for the 2013 MSUs is not reversed if the pre-determined stock price hurdles are not satisfied.

2013 Time-Based RSUs and PSUs:

In February 2013, the Board of Directors granted 294,000 shares to the executive officers. These grants included 74,000 shares of time-based RSUs which vested over two years on a quarterly basis, and 220,000 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets in 2014 (“2013 Executive PSUs”). The maximum number of 2013 Executive PSUs that an executive officer could receive was 300% of the target shares. In February 2015, the Compensation Committee approved the revenue achievement for the 2013 Executive PSUs and an additional 402,000 shares were awarded to the executive officers. Half of the 2013 Executive PSUs vested in February 2015 and the remaining shares vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In February 2013, the Board of Directors granted 215,000 shares to non-executive employees. These grants included 124,000 shares of time-based RSUs which vest over four years on a quarterly or annual basis, and 91,000 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets for the Company as a whole, certain regions or product-line divisions in 2014 (“2013 Non-Executive PSUs”). The maximum number of 2013 Non-Executive PSUs an employee could receive was either 200% or 300% of the target shares, depending on the job classifications of the employees. In February 2015, the Compensation Committee approved the revenue achievement for the 2013 Non-Executive PSUs and an additional 63,000 shares were awarded to the employees. Half of the 2013 Non-Executive PSUs vested in February 2015 and the remaining shares vest over the following two years on a quarterly or annual basis. The vesting is subject to the employees’ continued employment with the Company.

 2012 Time-Based RSUs and PSUs:

In February 2012, the Board of Directors granted 413,000 shares to the executive officers. These grants included 206,500 shares of time-based RSUs which vested over two years on a quarterly basis, and 206,500 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets in 2013 (“2012 Executive PSUs”). The maximum number of 2012 Executive PSUs that an executive officer could receive was 300% of the target shares. In February 2014, the Compensation Committee approved the revenue achievement for the 2012 Executive PSUs and an additional 139,000 shares were awarded to the executive officers. Half of the 2012 Executive PSUs vested in February 2014 and the remaining shares vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In April 2012, the Board granted 345,000 shares to non-executive employees. These grants included 220,000 shares of time-based RSUs which vest over four years on a quarterly or annual basis, and 125,000 shares of PSUs which represented a target number of shares that would be awarded upon achievement of certain pre-determined revenue targets for the Company as a whole, certain regions or product-line divisions in 2013 (“2012 Non-Executive PSUs”). The maximum number of shares an employee could receive was either 200% or 300% of the target shares, depending on the job classifications of the employees. In April 2014, the Compensation Committee approved the revenue achievement for the 2012 Non-Executive PSUs and an additional 30,000 shares were awarded to the employees. Half of the 2012 Non-Executive PSUs vested in the second quarter of 2014 and the remaining shares vest over the following two years on a quarterly or annual basis. The vesting is subject to the employees’ continued employment with the Company.

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2011 and 2012 CEO Awards:

In February 2011, the Board of Directors granted 153,000 shares of time-based RSUs to the CEO. In February 2012, the Board of Directors approved the modification of half of the time-based RSUs to PSUs (“2012 CEO PSUs”). The time-based RSUs that were not modified vested over two years on a quarterly basis from February 2011 to February 2013. The 2012 CEO PSUs would vest upon achievement of the pre-determined performance goals based on the Company’s 2012 revenue and the CEO’s continued employment. The maximum number of 2012 CEO PSUs that could be released was 100% of the target shares. In February 2013, the Compensation Committee determined that the pre-determined performance goals were met and the 2012 CEO PSUs were released in February 2013.  

Stock Options 

A summary of the stock options activities is presented in the table below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Outstanding at January 1, 2012		4,863		$	15.31		3.4	$	8,817
Options granted (1)		178		$	15.63
Options exercised		(1,152	)	$	11.62
Options forfeited and expired		(76	)	$	20.90
Outstanding at December 31, 2012		3,813		$	15.62		2.6	$	25,380
Options exercised		(2,446	)	$	15.49
Options forfeited and expired		(11	)	$	15.27
Outstanding at December 31, 2013		1,356		$	15.86		1.9	$	25,506
Options exercised		(742	)	$	16.09
Options forfeited and expired		(24	)	$	10.07
Outstanding at December 31, 2014		590		$	15.80		1.2	$	20,039
Options exercisable at December 31, 2014 and expected to vest		590		$	15.80		1.2	$	20,026
Options exercisable at December 31, 2014		568		$	15.92		1.2	$	19,221

_______________________  

(1) Includes 171,000 options granted as a result of the equity award modification. See “Equity Award Modifications” above for further discussion.

The following table summarizes certain information related to outstanding and exercisable options as of December 31, 2014:

		Options Outstanding						Options Exercisable
Range of Exercises Prices		Shares		Weighted- Average Remaining Contractual Term		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
		(in thousands)		(in years)				(in thousands)
$	0.76 - $14.96		118		2.0	$	12.16		98	$	12.07
$	15.03 - $15.03		321		0.8	$	15.03		321	$	15.03
$	15.13 - $23.50		151		1.6	$	20.29		149	$	20.36
			590		1.2	$	15.80		568	$	15.92

Total intrinsic value of options exercised was $17.3 million, $27.8 million and $10.0 million for the years ended December 31, 2014, 2013 and 2012, respectively. The net cash proceeds from the exercise of stock options were $11.9 million, $37.9 million and $13.4 million for the years ended December 31, 2014, 2013 and 2012, respectively. At December 31, 2014, unamortized compensation expense related to unvested options was approximately $0.1 million with a weighted-average remaining recognition period of less than one year.

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The grant date fair value of stock options was determined using the Black-Scholes model with the following assumptions (excluding the options modification discussed above): 

	Year Ended
	December 31, 2012
Expected term (years)		4.1
Expected volatility		53.4	%
Risk-free interest rate		0.6	%
Dividend yield		-

 Employee Stock Purchase Plan

Under the 2004 Employee Stock Purchase Plan (the “ESPP”), eligible employees may purchase common stock through payroll deductions. Participants may not purchase more than 2,000 shares in a six-month offering period or stock having a value greater than $25,000 in any calendar year as measured at the beginning of the offering period in accordance with the Internal Revenue Code and applicable Treasury Regulations.  The ESPP provides for an annual increase by an amount equal to the least of 1.0 million shares, 2% of the outstanding shares of common stock on the first day of the year, or a number of shares as determined by the Board of Directors. For the years ended December 31, 2014, 2013 and 2012, 78,000, 111,000 and 152,000 shares, respectively, were issued under the ESPP. As of December 31, 2014, approximately 4.7 million shares were available for future issuance.

The intrinsic value for stock purchased was $0.9 million, $0.8 million and $1.0 million for the years ended December 31, 2014, 2013 and 2012, respectively. The unamortized expense as of December 31, 2014 was $0.1 million, which will be recognized by the first quarter of 2015. The Black-Scholes model was used to value the employee stock purchase rights with the following weighted-average assumptions:

	Year Ended December 31,
	2014			2013			2012
Expected term (years)		0.5			0.5			0.5
Expected volatility		29.4	%		28.0	%		45.8	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%
Dividend yield		0.7	%		-			-

Cash proceeds from the ESPP were $2.1 million, $2.1 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.

 8. STOCK REPURCHASE PROGRAM

In July 2013, the Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $100 million in the aggregate of its common stock through June 30, 2015. All shares are retired upon repurchase. The following table summarizes the repurchase activities under the program (in thousands, except per share amounts):

	Shares Repurchased		Average Price Per Share		Total Amount
Cumulative balance at January 1, 2014		664	$	31.06	$	20,615
Repurchases		1,051	$	39.19		41,198
Cumulative balance at December 31, 2014		1,715	$	36.04	$	61,813

As of December 31, 2014, $38.2 million remained available for future repurchases under the program.

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9. DIVIDENDS AND DIVIDEND EQUIVALENTS

2014 Cash Dividend Program

In June 2014, the Board of Directors approved a dividend program pursuant to which the Company intends to pay quarterly cash dividends on its common stock. Stockholders of record as of the last day of the quarter are entitled to receive the quarterly cash dividends declared by the Board of Directors, which are payable on the 15th of the following month. The Board of Directors declared the following cash dividends in 2014 (in thousands, except per-share amounts):

	Dividend Declared		Total
	per Share		Amount
Second quarter	$	0.15	$	5,817
Third quarter	$	0.15	$	5,823
Fourth quarter	$	0.15	$	5,826

As of December 31, 2014, accrued dividends totaled $5.8 million.

The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on the Company's financial condition, results of operations, capital requirements, business conditions and other factors, as well as a determination that cash dividends are in the best interests of the Company's stockholders. The Company anticipates that the cash used for future dividends will come from its current domestic cash and cash generated from ongoing U.S. operations. If cash held by the Company’s international subsidiaries is needed for the payment of dividends, the Company may be required to accrue and pay U.S. taxes to repatriate the funds.

Cash Dividend Equivalents

Beginning in June 2014, outstanding RSU awards contain rights to receive cash dividend equivalents under the Company’s stock plans, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accrued quarterly during the vesting periods of the RSUs and payable to the employees when the awards vest. Dividend equivalents accrued on the outstanding RSUs are forfeited if the employees do not fulfill their service requirement during the vesting periods. As of December 31, 2014, accrued dividend equivalents totaled $0.8 million.

2012 Special Cash Dividend

In December 2012, the Board of Directors declared a special cash dividend of $1.00 per common share, which was paid on December 28, 2012 to all stockholders of record as of the close of business on December 21, 2012, for a total of $35.7 million.  

10.   NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock, and calculated using the treasury stock method.

Beginning in June 2014, the Company’s outstanding RSU awards contain forfeitable rights to receive cash dividend equivalents, which are accrued quarterly during the vesting periods of the RSUs and payable to the employees when the awards vest. Dividend equivalents accrued on outstanding RSUs are forfeited if the employees do not fulfill their service requirement during the vesting periods. Accordingly, these awards are not treated as participating securities in the net income per share calculation.

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The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Year Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	35,495	$	22,898	$	15,756
Denominator:
Weighted-average outstanding shares used to compute basic net income per share		38,686		37,387		34,871
Effect of dilutive securities		1,107		1,233		1,376
Weighted-average outstanding shares used to compute diluted net income per share		39,793		38,620		36,247
Net income per share:
Basic	$	0.92	$	0.61	$	0.45
Diluted	$	0.89	$	0.59	$	0.43

For the year ended December 31, 2014, there were no anti-dilutive common stock equivalents. For the years ended December 31, 2013 and 2012, approximately 2,000 and 1.1 million weighted-average common stock equivalents, respectively, were excluded from the calculation of diluted net income per share because their inclusion would have been anti-dilutive.

11.  INCOME TAXES

The components of income (loss) before income taxes are as follows (in thousands):

	Year Ended December 31,
	2014		2013			2012
United States	$	3,173	$	(2,309	)	$	807
International		33,219		26,316			17,083
Total income before income taxes	$	36,392	$	24,007		$	17,890

Management’s intent is to indefinitely reinvest any undistributed earnings from its foreign subsidiaries. Accordingly, no provision for Federal and state income or foreign withholding taxes has been provided thereon, nor is it practical to determine the amount of this liability. Upon distribution of those earnings in the form of dividends or otherwise, the Company will be subject to U.S. income taxes and potential foreign withholding taxes. As of December 31, 2014 and 2013, the unremitted earnings of foreign subsidiaries were $172.7 million and $141.0 million, respectively. The Company has sufficient cash reserves in the U.S. and intends to use the undistributed foreign earnings to fund foreign operations and research and development needs, planned capital outlay and expansion.

The components of the income tax provision are as follows (in thousands):

	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	18		$	77		$	840
State		(28	)		67			3
Foreign		943			1,053			1,302
Deferred:
Foreign		(36	)		(88	)		(11	)
Total income tax provision	$	897		$	1,109		$	2,134

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The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows:

	Year Ended December 31,
	2014			2013			2012
U.S. statutory federal tax rate		34.0	%		34.0	%		34.0	%
State, net of federal benefit		-			0.3			-
Research and development credits		(0.3	)		-			(3.6	)
Stock-based compensation		(9.3	)		(13.7	)		0.1
Foreign income at lower rates		(27.7	)		(33.8	)		(28.4	)
Changes in valuation allowance		6.2			16.8			7.0
Litigation reserves and other		(0.4	)		1.0			2.8
Effective tax rate		2.5	%		4.6	%		11.9	%

The components of net deferred tax assets consist of the following (in thousands):

	As of December 31,
	2014			2013
Deferred tax assets:
Research tax credits	$	10,393		$	8,303
Other expenses not currently deductible		4,861			3,204
Stock-based compensation		4,068			2,599
Litigation settlement		-			2,490
Net operating losses		298			627
Depreciation and amortization		181			291
Total deferred tax assets		19,801			17,514
Valuation allowance		(19,051	)		(16,739	)
Net deferred tax assets	$	750		$	775

As a result of the cost sharing arrangements with the Company’s international subsidiaries (cost share arrangements), relatively small changes in costs that are not subject to sharing under the cost share arrangements can significantly impact the overall profitability of the U.S. entity. Because of the U.S. entity’s inconsistent earnings history and uncertainty of future earnings, the Company has determined that it is more likely than not that the U.S. deferred tax benefits would not be realized. The Company will continue to evaluate if its facts and circumstances warrant a reversal of the valuation allowance against the U.S. deferred tax benefits in future periods. 

As of December 31, 2014 and 2013, the Company had a valuation allowance of $19.1 million and $16.7 million, respectively, attributable to management’s determination that it is more likely than not that most of the deferred tax assets in the U.S. will not be realized. Should it be determined that additional amounts of the net deferred tax asset will not be realized in the future, an adjustment to increase the deferred tax asset valuation allowance will be charged to income in the period such determination is made. Likewise, in the event the Company were to determine that it is more likely than not that it would be able to realize its deferred tax assets in the future in excess of its net recorded amount, an adjustment to the valuation allowance for the deferred tax asset would increase income in the period such determination was made.

As of December 31, 2014, the federal and state net operating loss carryforwards for income tax purposes were approximately $24.5 million and $33.2 million, respectively. The federal net operating loss carryforwards will begin to expire in 2027 and the state net operating loss carry forwards will expire beginning in 2018. $24.5 million of the federal net operating loss carry forwards and $28.0 million of the state operating loss carry forwards are related to excess tax benefits as a result of stock option exercises and therefore will be recorded in additional paid-in-capital in the period that they become realized. The Company has elected to follow the “with and without” approach to account for excess tax benefits from stock options exercises. In addition, the Company only considers the direct effects of stock option exercises when calculating the amount of windfalls or shortfalls.

As of December 31, 2014, the Company had research tax credit carryforwards of $16.7 million for federal income tax purposes, which will begin to expire in 2020, and $14.7 million for state income tax purposes, which can be carried forward indefinitely. $4.0 million of the federal research tax credit and $1.4 million of the state research tax credit carryovers are related to excess tax benefits as a result of stock option exercises and therefore will be recorded in additional-paid-in-capital in the period that they become realized.

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In December 2014, the President signed into law The Tax Increase Prevention Act of 2014 (the “2014 Act”).  Under prior law, a taxpayer was entitled to a research credit for qualifying amounts paid or incurred on or before December 31, 2013. The 2014 Act extends the research credit to December 31, 2014. As a result of the retroactive extension, the Company had an increase to its federal R&D credits of approximately $1.9 million for qualifying amounts incurred in 2014. However, due to the Company’s current valuation allowance position, the credit did not result in a tax benefit.

In the event of a change in ownership, as defined under federal and state tax laws, the Company's net operating loss and tax credit carryforwards could be subject to annual limitations.  The annual limitations could result in the expiration of the net operating loss and tax credit carryforwards prior to utilization.

At December 31, 2014, the Company had $16.4 million of unrecognized tax benefits, $4.8 million of which would affect its effective tax rate if recognized after considering the valuation allowance. At December 31, 2013, the Company had $14.9 million of unrecognized tax benefits, $5.0 million of which would affect its effective tax rate if recognized after considering the valuation allowance.

 A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):

Balance as at January 1, 2012	$	12,204
Gross increase for tax position of prior year		188
Gross increase for tax position of current year		689
Balance as of December 31, 2012		13,081
Gross increase for tax position of prior year		646
Gross increase for tax position of current year		1,528
Reduction for prior year tax position		(333	)
Balance as of December 31, 2013		14,922
Gross increase for tax position of prior year		584
Gross increase for tax position of current year		1,760
Reduction for prior year tax position		(860	)
Balance as of December 31, 2014	$	16,406

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of December 31, 2014 and 2013, the Company has approximately $0.5 million and $0.8 million, respectively, of accrued interest related to uncertain tax positions, which were recorded in long-term income tax liabilities in the Consolidated Balance Sheets.

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the research and development tax credit. It is reasonably possible that over the next twelve-month period, the Company may experience increases or decreases in its unrecognized tax benefits. However, it is not possible to determine either the magnitude or the range of increases or decreases at this time.

In Switzerland where the Company designs and sells certain of its products, the Company’s earnings are currently subject to a tax holiday.  The tax holiday is currently being reviewed for an extension through 2018 by local Swiss tax authorities. The benefit resulting from the tax holiday had an insignificant impact on earnings per share for the year ended December 31, 2014.

On September 13, 2013, the U.S. Treasury Department and the IRS issued final regulations that address costs incurred in acquiring, producing, or improving tangible property (the "tangible property regulations"). The tangible property regulations are effective for tax years beginning on or after January 1, 2014. Given its full valuation allowance, the regulations did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.

Income Tax Audits

The Company is subject to examination of its income tax returns by the IRS and other tax authorities. The Company’s U.S. Federal income tax returns for the years ended December 31, 2005 through December 31, 2007 are under examination by the IRS. In April 2011, the Company received from the IRS a Notice of Proposed Adjustment ("NOPA") relating to a cost-sharing agreement entered into by the Company and its international subsidiaries on January 1, 2004. In the NOPA, the IRS objected to the Company’s allocation of certain litigation expenses between the Company and its international subsidiaries and the amount of "buy-in payments" made by the international subsidiaries to the Company in connection with the cost-sharing agreement, and proposed to increase the Company’s U.S. taxable income according to a few alternative methodologies. In February 2012, the Company received a revised NOPA from the IRS (“Revised NOPA”). In this Revised NOPA, the IRS raised the same issues as in the NOPA issued in April 2011 but under a different methodology. Under the Revised NOPA, the largest potential federal income tax payment, if the IRS were to prevail on all matters in dispute, is $10.5 million, plus interest and penalties, if any. The Company responded to the IRS Revised NOPA in May 2012. In June 2013, the IRS responded and continued to disagree with the Company’s rebuttal. The Company met with the IRS Office of Appeals in 2014, had additional discussions again in 2015, and both parties have been in continuous discussions for a resolution of the matter. However, there is no guarantee these discussions will be conclusive. Meanwhile, the Company agreed to grant the IRS an extension of the statute of limitations for taxable years 2005 through 2007 to September 30, 2015. 

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The IRS also audited the research and development credits carried forward into year 2005 and the credits generated in the years 2005 through 2007. The Company received a NOPA from the IRS in February 2011, proposing to reduce the research and development credits generated in years 2005 through 2007 and the carryforwards, which would then reduce the value of such credits carried forward to subsequent tax years.

The Company reviewed and responded to the above proposed adjustments. The Company regularly assesses the likelihood of an adverse outcome resulting from such examinations to determine the adequacy of its provision for income taxes. As of December 31, 2014, based on the technical merits of its tax return filing positions and the interactions to date with the IRS, the Company believes that it is more-likely-than-not that the resolution of the audits will not have a material impact on its consolidated financial position, results of operations and cash flows.

12.  COMMITMENTS AND CONTINGENCIES

Lease Obligations

As of December 31, 2014, future minimum payments under the non-cancelable operating leases were as follows (in thousands):

2015	$	1,094
2016		763
2017		297
2018 and thereafter		168
Total	$	2,322

In September 2004, the Company entered into a lease arrangement for its manufacturing facility located in Chengdu, China. The Company has the option to acquire the facility for approximately $1.6 million which consists of total construction costs minus total rent paid by the Company during the lease term. This option became exercisable in March 2011. The Company may exercise its purchase option and enter into a purchase agreement for this facility in the future.

The Company also leases sales and research and development offices in the United States, Japan, China, Europe, Taiwan and Korea. Certain of the Company’s facility leases provide for periodic rent increases. Rent expense for the years ended December 31, 2014, 2013 and 2012 was $1.5 million, $1.2 million and $1.6 million, respectively.

Warranty and Indemnification Provisions

The Company generally provides a standard one to two-year warranty against defects in materials and workmanship and will either repair the goods or provide replacements at no charge to the customer for defective units. In such cases, the Company accrues for the related costs at the time the decision to permit the return is made. Reserve requirements are recorded in the period of sale and are based on an assessment of the products sold with warranty and historical warranty costs incurred.

The changes in warranty reserves are as follows (in thousands):

	Year Ended December 31,
	2014			2013			2012
Balance at beginning of period	$	451		$	331		$	561
Warranty provision for product sales		282			476			917
Settlements made		(42	)		(117	)		(675	)
Unused warranty provision		(451	)		(239	)		(472	)
Balance at end of period	$	240		$	451		$	331

The Company provides indemnification agreements to certain direct or indirect customers. The Company agrees to reimburse these parties for any damages, costs and expenses incurred by them as a result of legal actions taken against them by third parties for infringing upon their intellectual property rights as a result of using the Company’s products and technologies. These indemnification provisions are varied in their scope and are subject to certain terms, conditions, limitations and exclusions. There were no indemnification liabilities incurred in 2014, 2013 and 2012. The Company also provides for indemnification of its directors and officers.

65

13.  LITIGATION

The Company and certain of its subsidiaries are parties to actions and proceedings in the ordinary course of business, including litigation regarding its shareholders and its intellectual property, challenges to the enforceability or validity of its intellectual property and claims that the Company’s products infringe on the intellectual property rights of others. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims.

O2 Micro

In May 2012, the United States District Court for the Northern District of California (the “District Court”) issued an order finding O2 Micro International, Ltd. (“O2 Micro”) liable for approximately $9.1 million in attorneys’ fees and non-taxable costs, plus interest, in connection with the patent litigation that the Company won in 2010.  This award was in addition to the approximately $0.3 million in taxable costs that the District Court had earlier ordered O2 Micro to pay to the Company in connection with the same lawsuit.  In October 2012, O2 Micro appealed the District Court’s judgment to the United States Court of Appeals for the Federal Circuit (the “Federal Circuit”). In August 2013, the Federal Circuit affirmed O2 Micro’s liability for the full amount of the award.  In September 2013, O2 Micro filed a petition for rehearing of that ruling, but the Federal Circuit denied O2 Micro’s petition for rehearing in October 2013. 

In November 2013, the Company received a cash payment of $9.5 million from O2 Micro. In January 2014, O2 Micro filed an appeal with the United States Supreme Court. Had O2 Micro been successful in obtaining a favorable ruling against the Company, the Company could have been liable to return a portion or all of the $9.5 million to O2 Micro. Accordingly, the Company recorded the $9.5 million as a current liability as of December 31, 2013.

In March 2014, the Supreme Court declined to hear the case. As O2 Micro had no further legal avenues to appeal, the Company released the current liability of $9.5 million and recorded the award as a credit to litigation benefit, net, in the Consolidated Statements of Operations in the first quarter of 2014. In addition, the Company incurred additional legal fees of $0.5 million in connection with the final resolution of the lawsuit.

 Silergy

In December 2011, the Company entered into a settlement and license agreement with Silergy Corp. and Silergy Technology for infringement of the Company’s patent whereby the Company would receive a total of $2.0 million.  The first $1.2 million was paid in equal installments of $300,000 in each quarter of 2012 and the remainder was paid in two equal installments in the first two quarters of 2013. No further amount was due to the Company as of December 31, 2013. All amounts were recorded as credits to litigation benefit, net, in the Consolidated Statements of Operations in the periods the proceeds were received.

Linear

In August 2012, the United States Court of Appeals for the Federal Circuit issued an order affirming the judgment issued by the United States District Court for the District of Delaware finding Linear Technology Corporation (“Linear”) liable for approximately $2.3 million in attorneys’ fees and non-taxable costs, plus interest, in connection with the litigation regarding a contract dispute that the Company won in 2011. During the fourth quarter of 2012, the Company received a payment from Linear of $2.3 million plus $0.2 million reimbursement of additional attorney fees in connection with the cost of defending the appeal, which was recorded as a credit to litigation benefit, net, in the Consolidated Statements of Operations. 

14.  EMPLOYEE BENEFIT PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the United States who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan in 2014, 2013 and 2012.

66

15.  SIGNIFICANT CUSTOMERS

The Company sells its products primarily through third-party distributors, value-added resellers and directly to original equipment manufacturers, original design manufacturers, and electronic manufacturing service providers. The following table summarizes those customers with sales greater than 10% of the Company's total revenue or accounts receivable balances greater than 10% of the Company’s total accounts receivable: 

	Revenue									Accounts Receivable
	Year Ended December 31,									As of December 31,
Customers	2014			2013			2012			2014			2013
Distributor A		26	%		32	%		32	%		31	%		32	%
Distributor B		*			10	%		*			10	%		17	%

____________

* Represents less than 10%.

Both of the customers are third-party distributors. The Company’s agreements with these distributors were made in the ordinary course of business and may be terminated with or without cause by either party with advance notice. Although the Company may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with either of these distributors was terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a few quarters following the termination of any agreement with a distributor.

16.  SEGMENT AND GEOGRAHPIC INFORMATION 

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance, mixed-signal analog semiconductors for the communications, storage and computing, consumer and industrial markets. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations.

The following is a summary of revenue by geographic regions (in thousands):

	Year Ended December 31,
Country or Region	2014		2013		2012
China	$	181,050	$	141,400	$	124,278
Taiwan		38,460		34,248		27,477
Europe		19,830		15,351		16,201
Korea		14,362		9,992		9,434
Southeast Asia		13,993		21,760		21,641
Japan		8,251		7,495		8,516
United States		6,392		7,525		5,711
Other		197		320		555
Total	$	282,535	$	238,091	$	213,813

The following is a summary of revenue by product family (in thousands):

	Year Ended December 31,
Product Family	2014		2013		2012
DC to DC products	$	253,083	$	211,337	$	188,736
Lighting control products		29,452		26,754		25,077
Total	$	282,535	$	238,091	$	213,813

The following is a summary of long-lived assets by geographic regions (in thousands):

	As of December 31,
Country	2014		2013
China	$	37,147	$	41,557
United States		33,913		24,719
Bermuda		13,383		-
Other		339		205
Total	$	84,782	$	66,481

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17. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (in thousands):

	Unrealized Losses on Auction-Rate Securities			Unrealized Gains (Losses) on Other Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2013	$	(490	)	$	37		$	4,628		$	4,175
Other comprehensive income (loss) before reclassifications		130			(29	)		1,988			2,089
Amounts reclassified from accumulated other comprehensive income		-			(4	)		-			(4	)
Net current period other comprehensive income (loss)		130			(33	)		1,988			2,085
Balance as of December 31, 2013		(360	)		4			6,616			6,260
Other comprehensive income (loss) before reclassifications		179			(17	)		(609	)		(447	)
Amounts reclassified from accumulated other comprehensive income		-			(2	)		-			(2	)
Net current period other comprehensive income (loss)		179			(19	)		(609	)		(449	)
Balance as of December 31, 2014	$	(181	)	$	(15	)	$	6,007		$	5,811

The amounts reclassified from accumulated other comprehensive income were recorded in interest and other income, net, in the Consolidated Statement of Operations.

18. QUARTERLY FINANCIAL DATA (UNAUDITED)

	Three Months Ended
	March 31, 2014			June 30, 2014		September 30, 2014			December 31, 2014
	(in thousands, except per share amounts)
Revenue	$	60,061		$	68,436	$	78,335		$	75,703
Cost of revenue		27,964			31,337		35,872			34,744
Gross profit		32,097			37,099		42,463			40,959
Operating expenses:
Research and development		15,603			13,368		14,679			14,941
Selling, general and administrative		16,109			16,853		17,006			16,787
Litigation expense (benefit), net		(8,700	)		274		332			66
Total operating expenses		23,012			30,495		32,017			31,794
Income from operations		9,085			6,604		10,446			9,165
Interest and other income, net		190			295		202			407
Income before income taxes		9,275			6,899		10,648			9,572
Income tax provision (benefit)		257			502		(573	)		712
Net income	$	9,018		$	6,397	$	11,221		$	8,860
Net income per share:
Basic	$	0.23		$	0.17	$	0.29		$	0.23
Diluted	$	0.23		$	0.16	$	0.28		$	0.22
Weighted-average shares outstanding:
Basic		38,470			38,684		38,785			38,807
Diluted		39,517			39,608		39,727			40,321
Cash dividends declared per common share	$	-		$	0.15	$	0.15		$	0.15

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	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenue	$	51,470		$	57,714		$	65,347		$	63,560
Cost of revenue		24,085			26,786			30,053			29,266
Gross profit		27,385			30,928			35,294			34,294
Operating expenses:
Research and development		12,123			12,478			12,643			12,487
Selling, general and administrative		13,258			13,793			13,891			13,683
Litigation expense (benefit), net		(301	)		(257	)		104			84
Total operating expenses		25,080			26,014			26,638			26,254
Income from operations		2,305			4,914			8,656			8,040
Interest and other income (expense), net		(10	)		218			(59	)		(57	)
Income before income taxes		2,295			5,132			8,597			7,983
Income tax provision (benefit)		(204	)		(357	)		1,187			484
Net income	$	2,499		$	5,489		$	7,410		$	7,499
Net income per share:
Basic	$	0.07		$	0.15		$	0.20		$	0.20
Diluted	$	0.07		$	0.14		$	0.19		$	0.19
Weighted-average shares outstanding:
Basic		36,259			37,053			37,910			38,328
Diluted		37,708			38,239			39,009			39,524
Cash dividends declared per common share	$	-		$	-		$	-		$	-

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ITEM 9.    CHANGES IN AND DISAGREEEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A.    CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934 as of the end of the period covered by this Annual Report on Form 10-K. 

Based on this evaluation, our chief executive officer and chief financial officer concluded that, as of December 31, 2014, our disclosure controls and procedures are designed at a reasonable assurance level and are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our chief executive officer and chief financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that our internal control over financial reporting was effective as of December 31, 2014. Management reviewed the results of its assessment with our Audit Committee.

Our independent registered public accounting firm, Deloitte & Touche LLP, which audited the consolidated financial statements included in this Annual Report on Form 10-K, has issued an attestation report on the effectiveness of our internal control over financial reporting. 

Changes in Internal Control over Financial Reporting

We completed the acquisition of Sensima Technology SA (“Sensima”) in July 2014 and are currently evaluating the internal control at Sensima. We intend to include the acquired entity in our assessment of the effectiveness of internal control over financial reporting in the annual management report following the first anniversary of the acquisition. Other than the Sensima acquisition, there were no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2014 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Limitations on Effectiveness of Controls and Procedures

In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs.

70

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Monolithic Power Systems, Inc.

San Jose, California

We have audited the internal control over financial reporting of Monolithic Power Systems, Inc. and subsidiaries (the "Company") as of December 31, 2014, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company's principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2014, based on the COSO criteria.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements as of and for the year ended December 31, 2014 of the Company and our report dated March 2, 2015 expressed an unqualified opinion on those financial statements.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

March 2, 2015

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ITEM 9B.   OTHER INFORMATION

None.

PART III

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Reference is made to the information regarding directors and nominees, code of ethics, corporate governance matters and disclosure relating to compliance with Section 16(a) of the Securities Exchange Act of 1934 appearing under the captions “Election of Directors” and “Compliance with Section 16(a) Beneficial Ownership Reporting Compliance” in the Company’s Proxy Statement for its Annual Meeting of Stockholders (the “2015 Annual Meeting”), which information is incorporated in this Annual Report on Form 10-K by reference. Information regarding executive officers is set forth under the caption “Executive Officers of the Registrant” in Part I of this Annual Report on Form 10-K.

ITEM 11.    EXECUTIVE COMPENSATION

The information required by this item will be set forth under “Executive Officer Compensation” in the Company’s Proxy Statement for the 2015 Annual Meeting, and is incorporated herein by reference.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by this item will be set forth under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plan Information” in the Company’s Proxy Statement for the 2015 Annual Meeting, and is incorporated herein by reference.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this item will be set forth under the captions “Certain Relationships and Related Transactions” and “Election of Directors” in the Company’s Proxy Statement for the 2015 Annual Meeting, and is incorporated herein by reference.

ITEM 14.    PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by this item will be set forth under the caption “Audit and Other Fees” in the Company’s Proxy Statement for the 2015 Annual Meeting, and is incorporated herein by reference.

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PART IV

ITEM 15.    EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a) Documents filed as part of this report

(1) All financial statements

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets

Consolidated Statements of Operations

Consolidated Statements of Comprehensive Income

Consolidated Statements of Stockholders’ Equity

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

(2) Schedules

All schedules have been omitted because the required information is not present or not present in amounts sufficient to require submission of the schedules, or because the information required is included in the consolidated financial statements or notes thereto.

(3) Exhibits

Exhibit Number	Description
3.1 (1)	Amended and Restated Certificate of Incorporation.
3.2 (2)	Amended and Restated Bylaws.
10.1+ (3)	Registrant’s 1998 Stock Plan and form of option agreement.
10.2+ (4)	Registrant’s 2004 Employee Stock Purchase Plan and form of subscription agreement.
10.3+ (5)	Form of Directors’ and Officers’ Indemnification Agreement.
10.4† (6)	Foundry Agreement between the Registrant and Advanced Semiconductor Manufacturing Corp. of Shanghai, dated August 14, 2001.
10.5+ (7)	Employment Agreement with Michael Hsing and Amendment thereof.
10.6+ (8)	Employment Agreement with Maurice Sciammas and Amendment thereof.
10.7+ (9)	Employment Agreement with Jim Moyer.
10.8+(10)	Employment Agreement with Deming Xiao and Amendment thereof.
10.9 (11)	Distribution Agreement with Asian Information Technology Inc. Ltd., dated March 1, 2004.
10.10†(12)	Investment and Cooperation Contract, dated August 19, 2004.
10.11+(13)	Form of Performance Unit Agreement.
10.12+(14)	Letter Agreement with Victor Lee.
10.13+(15)	Letter Agreement with Douglas McBurnie.
10.14+(16)	Letter Agreement with Karen A. Smith Bogart.
10.15+(17)	Registrant’s Employee Bonus Plan, as amended effective March 6, 2008.
10.16+(18)	Form of Restricted Stock Award Agreement.
10.17+(19)	Letter Agreement with Jeff Zhou.
10.18+(20)	Employment Agreement with Meera P. Rao and Saria Tseng and Amendments thereof.

73 

10.19+(21)	Monolithic Power Systems, Inc. Master Cash Performance Bonus Plan.
10.20+(22)	Letter Agreement with Eugen Elmiger.
10.21+(23)	Monolithic Power Systems, Inc. 2004 Equity Incentive Plan, as Amended, and Form of Grant Agreement.
10.22+(24)	Monolithic Power Systems, Inc. 2014 Equity Incentive Plan and Form of Grant Agreement.

21.1	Subsidiaries of Monolithic Power Systems, Inc.
23.1	Consent of Independent Registered Public Accounting Firm.
24.1	Power of Attorney (included on Signature page to this Form 10-K).
31.1	Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation
101.DEF	XBRL Taxonomy Extension Definition
101.LAB	XBRL Taxonomy Extension Labels
101.PRE	XBRL Taxonomy Extension Presentation

+	Management contract or compensatory plan or arrangement.
†	Confidential treatment requested for portions of this agreement, which portions have been omitted and filed separately with the Securities and Exchange Commission
*	This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference in any filings under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date hereof and irrespective of any general incorporation language in any filings.
(1)	Incorporated by reference to Exhibit 3.2 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.
(2)	Incorporated by reference to Exhibit 3.4 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.
(3)	Incorporated by reference to Exhibit 10.1 of the Registrant’s Registration Statement on Form S-1 (Registration No. 333-117327), filed with the Securities and Exchange Commission on July 13, 2004.
(4)	Incorporated by reference to Exhibit 10.3 of the Registrant’s Registration Statement on Form S-1 (Registration No. 333-117327), filed with the Securities and Exchange Commission on July 13, 2004.
(5)	Incorporated by reference to Exhibit 10.4 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 15, 2004.
(6)	Incorporated by reference to Exhibit 10.5 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on November 2, 2004.
(7)	Incorporated by reference to Exhibit 10.7 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.

74 

(8)	Incorporated by reference to Exhibit 10.8 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.3 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.
(9)	Incorporated by reference to Exhibit 10.9 of the Registrant’s Registration Statement on Form S-1 (Registration No. 333-117327), filed with the Securities and Exchange Commission on July 13, 2004.
(10)	Incorporated by reference to Exhibit 10.10 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008 and Exhibit 10.4 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on December 19, 2008.
(11)	Incorporated by reference to Exhibit 10.11 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on September 10, 2004.
(12)	Incorporated by reference to Exhibit 10.13 of the Registrant’s Registration Statement on Form S-1/A (Registration No. 333-117327), filed with the Securities and Exchange Commission on September 10, 2004.
(13)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on November 1, 2006.
(14)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on September 14, 2006.
(15)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on May 25, 2007.
(16)	Incorporated by reference to Exhibit 10.2 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on May 25, 2007.
(17)	Incorporated by reference to Exhibit 10.31 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 11, 2008.
(18)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 15, 2008.
(19)	Incorporated by reference to Exhibit 10.1 of the Registrant’s current report on Form 8-K (File No. 000-51026), filed with the Securities and Exchange Commission on February 3, 2010.
(20)	Incorporated by reference to Exhibit 10.33 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 4, 2011.
(21)	Incorporated by reference to Annexure C of the Registrant’s Proxy Statement on Schedule 14A (File No. 000-51026), filed with the Securities and Exchange Commission on April 30, 2013.
(22)	Incorporated by reference to Exhibit 10.36 of the Registrant’s annual report on Form 10-K (File No. 000-51026), filed with the Securities and Exchange Commission on March 10, 2014.
(23)	Incorporated by reference to Exhibit 4.4 of the Registrant’s Registration Statement on Form S-8 (Registration No. 333-199782), filed with the Securities and Exchange Commission on November 3, 2014.
(24)	Incorporated by reference to Exhibit 4.6 of the Registrant’s Registration Statement on Form S-8 (Registration No. 333-199782), filed with the Securities and Exchange Commission on November 3, 2014.

75

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

	MONOLITHIC POWER SYSTEMS, INC.
Date: March 2, 2015	By:	/s/ MICHAEL R. HSING
		Michael R. Hsing
		President and Chief Executive Officer

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Michael R. Hsing and Meera P. Rao, jointly and severally, his or her attorneys-in-fact, each with the power of substitution, for him or her in any and all capacities, to sign any amendments to this Annual Report on Form 10-K, and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact, or his or her substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on March 2, 2015 by the following persons on behalf of the registrant and in the capacities indicated:

/s/ MICHAEL R. HSING	President, Chief Executive Officer, and Director (Principal Executive Officer)
MICHAEL R. HSING
/s/ MEERA P. RAO	Chief Financial Officer (Principal Financial and Accounting Officer)
MEERA P. RAO
/s/ KAREN A. SMITH BOGART	Director
KAREN A. SMITH BOGART
/s/ HERBERT CHANG	Director
HERBERT CHANG
/s/ EUGEN ELMIGER	Director
EUGEN ELMIGER
/s/ VICTOR K. LEE	Director
VICTOR K. LEE
/s/ JAMES C. MOYER	Director
JAMES C. MOYER
/s/ JEFF ZHOU	Director
JEFF ZHOU

 76

EX-21.1

Exhibit 21.1

Subsidiaries of Monolithic Power Systems, Inc.

MPS International Ltd. (Bermuda)

MPS International (Shanghai) Ltd.

Chengdu Monolithic Power Systems Co., Ltd.

MPS International Korea Co., Ltd.

MPS Japan G.K.

MPS Japan K.K.

MPS Europe SARL

Hangzhou MPS Semiconductor Technology Ltd.

MPS International (Taiwan) Ltd.

Monolithic Power Systems (Singapore) Pte. Ltd.

MPS Germany GmbH

Sensima Technology SA.

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-199782, 333-198856, 333-187117, 333-180047, 333-172013, 333-164673, 333-157095, 333-149027, 333-120886, 333-132411, and 333-140563 on Form S-8 of our reports dated March 2, 2015 relating to the consolidated financial statements of Monolithic Power Systems, Inc. and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting appearing in this annual report on Form 10-K of the Company for the year ended December 31, 2014.

/s/ DELOITTE & TOUCHE LLP

San Jose, California

March 2, 2015

EX-31.1

 Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael R. Hsing, certify that:

1. I have reviewed this Annual Report on Form 10-K of Monolithic Power Systems, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 2, 2015

/s/ MICHAEL R. HSING

Michael R. Hsing

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Meera Rao, certify that:

1. I have reviewed this Annual Report on Form 10-K of Monolithic Power Systems, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: March 2, 2015

/s/ MEERA RAO

Meera Rao

Chief Financial Officer

EX-32.1

Exhibit 32.1

The following certification shall not be deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date hereof and irrespective of any general incorporation language in any filings.

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND

CHIEF FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Monolithic Power Systems, Inc., a Delaware corporation, for the year ended December 31, 2014, as filed with the Securities and Exchange Commission, each of the undersigned officers of Monolithic Power Systems, Inc. certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the accompanying report on Form 10-K of Monolithic Power Systems, Inc. for the year ended December 31, 2014, as filed with the Securities and Exchange Commission (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Monolithic Power Systems, Inc. for the periods presented therein.

Date: March 2, 2015

/s/ MICHAEL R. HSING

Michael R. Hsing

Chief Executive Officer

Date: March 2, 2015

/s/ MEERA RAO

Meera Rao

Chief Financial Officer

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Note 15 - Significant Customers (Tables)

12 Months Ended

Dec. 31, 2014

Risks and Uncertainties [Abstract]

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	Revenue									Accounts Receivable
	Year Ended December 31,									As of December 31,
Customers	2014			2013			2012			2014			2013
Distributor A		26	%		32	%		32	%		31	%		32	%
Distributor B		*			10	%		*			10	%		17	%

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Note 4 - Fair Value Measurement (Details) - Financial Assets and Liabilities, Fair Value (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Money market funds	$ 60,078	$ 35,588
Certificates of deposit	22,778
U.S. treasuries and government agency bonds	89,674	128,126
Total	180,155	173,574
Liabilities:
Contingent consideration	2,507
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Money market funds	60,078	35,588
Money Market Funds [Member]
Assets:
Money market funds	60,078	35,588
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Certificates of deposit	22,778
Certificates of Deposit [Member]
Assets:
Certificates of deposit	22,778
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
U.S. treasuries and government agency bonds	89,674	128,126
US Government Agencies Short-term Debt Securities [Member]
Assets:
U.S. treasuries and government agency bonds	89,674	128,126
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Auction-rate securities backed by student-loan notes	5,389	9,860
Auction Rate Securities [Member]
Assets:
Auction-rate securities backed by student-loan notes	5,389	9,860
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Mutual funds under deferred compensation plan	2,236
Equity Funds [Member]
Assets:
Mutual funds under deferred compensation plan	2,236
Fair Value, Inputs, Level 1 [Member]
Assets:
Total	62,314	35,588
Fair Value, Inputs, Level 2 [Member]
Assets:
Total	112,452	128,126
Fair Value, Inputs, Level 3 [Member]
Assets:
Total	5,389	9,860
Liabilities:
Contingent consideration	$ 2,507

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Note 3 - Cash, Cash Equivalents and Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2009	Dec. 31, 2013
Note 3 - Cash, Cash Equivalents and Investments (Details) [Line Items]
Auction Rate Securities Maturities	33 years
Gain (Loss) on Investments		$ 70,000
Percentage Of Auction Rate Securities Redeemed At Par Value	87.00%
Auction Rate Securities [Member]
Note 3 - Cash, Cash Equivalents and Investments (Details) [Line Items]
Redemption Auction Rate Securities	4,700,000		$ 2,000,000

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Note 7 - Stock-Based Compensation (Details) - Stock Options (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 01, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options [Abstract]
Outstanding at January 1, 2012	4,863,000	1,356,000	3,813,000	4,863,000
Outstanding at January 1, 2012	$ 15.31	$ 15.86	$ 15.62	$ 15.31
Outstanding at January 1, 2012	3 years 146 days	1 year 73 days	1 year 328 days	2 years 219 days
Outstanding at January 1, 2012	$ 8,817	$ 25,506	$ 25,380	$ 8,817
Shares		590,000	1,356,000	3,813,000
Weighted-Average Exercise Price		$ 15.80	$ 15.86	$ 15.62
Weighted-Average Remaining Contractual Term	3 years 146 days	1 year 73 days	1 year 328 days	2 years 219 days
Aggregate Intrinsic Value		20,039	25,506	25,380
Options exercisable at December 31, 2014 and expected to vest		590,000
Options exercisable at December 31, 2014 and expected to vest		$ 15.80
Options exercisable at December 31, 2014 and expected to vest		1 year 73 days
Options exercisable at December 31, 2014 and expected to vest		20,026
Options exercisable at December 31, 2014		568,000
Options exercisable at December 31, 2014		$ 15.92
Options exercisable at December 31, 2014		1 year 73 days
Options exercisable at December 31, 2014		$ 19,221
Options granted (1)		171,000		178,000	[1]
Options granted (1)				$ 15.63	[1]
Shares		(742,000)	(2,446,000)	(1,152,000)
Weighted-Average Exercise Price		$ 16.09	$ 15.49	$ 11.62
Shares		(24,000)	(11,000)	(76,000)
Weighted-Average Exercise Price		$ 10.07	$ 15.27	$ 20.90

[1] Includes 171,000 options granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

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Note 4 - Fair Value Measurement (Details) - Level 3 Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Ending balance	$ 5,389	$ 9,860
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2013	9,860	11,755
Sales and settlement at par	(4,650)	(2,025)
Change in unrealized loss included in other comprehensive income	179	130
Ending balance	$ 5,389	$ 9,860

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Note 10 - Net Income Per Share (Details) - Net Income Per Share Basic And Diluted (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income (in Dollars)	$ 8,860	$ 11,221	$ 6,397	$ 9,018	$ 7,499	$ 7,410	$ 5,489	$ 2,499	$ 35,495	$ 22,898	$ 15,756
Denominator:
Weighted-average outstanding shares used to compute basic net income per share									38,686	37,387	34,871
Effect of dilutive securities									1,107	1,233	1,376
Weighted-average outstanding shares used to compute diluted net income per share	40,321	39,727	39,608	39,517	39,524	39,009	38,239	37,708	39,793	38,620	36,247
Net income per share:
Basic (in Dollars per share)	$ 0.23	$ 0.29	$ 0.17	$ 0.23	$ 0.20	$ 0.20	$ 0.15	$ 0.07	$ 0.92	$ 0.61	$ 0.45
Diluted (in Dollars per share)	$ 0.22	$ 0.28	$ 0.16	$ 0.23	$ 0.19	$ 0.19	$ 0.14	$ 0.07	$ 0.89	$ 0.59	$ 0.43

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Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Intangible assets:
Goodwill	$ 6,571
IPR&D [Member] | Sensima [Member]
Intangible assets:
Intangible Assets	2,045
Know-How [Member] | Sensima [Member]
Intangible assets:
Intangible Assets	1,018
Developed Technology Rights [Member] | Sensima [Member]
Intangible assets:
Intangible Assets	4,421
Sensima [Member]
Note 2 - Acquisition (Details) - Estimated Fair Value of Assets Acquired and Liabilities Assumed [Line Items]
Cash	145
Other tangible assets acquired, net of liabilities assumed	42
Intangible assets:
Total identifiable net assets acquired	7,671
Goodwill	6,571
Total net assets acquired	$ 14,242

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Note 7 - Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Year Ended December 31,
	2014		2013		2012
Cost of revenue	$	903	$	631	$	510
Research and development		9,019		6,219		6,922
Selling, general and administrative		23,532		13,851		11,220
Tax benefit		-		-		(187	)
Total	$	33,454	$	20,701	$	18,465

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Time-Based RSUs			Weighted- Average Grant Date Fair Value Per Share		PSUs			Weighted- Average Grant Date Fair Value Per Share		MSUs		Weighted- Average Grant Date Fair Value Per Share		Total			Weighted- Average Grant Date Fair Value Per Share
	(in thousands)					(in thousands)					(in thousands)				(in thousands)
Outstanding at January 1, 2012		1,082		$	16.00		217		$	20.73		-	$	-		1,299		$	16.87
Modification (1)		(76	)	$	15.69		76		$	15.69		-	$	-		-		$	-
Granted (2)(3)		617		$	18.69		963		$	18.24		-	$	-		1,580		$	18.42
Performance adjustment (4)		-		$	-		(624	)	$	18.19		-	$	-		(624	)	$	18.19
Released		(447	)	$	17.30		(97	)	$	20.73		-	$	-		(544	)	$	17.91
Forfeited		(77	)	$	16.61		(4	)	$	19.07		-	$	-		(81	)	$	16.74
Outstanding at December 31, 2012		1,099		$	16.96		531		$	18.49		-	$	-		1,630		$	17.46
Granted (3)		299		$	24.25		875		$	24.43		1,800	$	23.57		2,974		$	23.89
Performance adjustment (4)		-		$	-		(124	)	$	21.98		-	$	-		(124	)	$	21.98
Released		(519	)	$	17.57		(206	)	$	18.90		-	$	-		(725	)	$	17.95
Forfeited		(125	)	$	17.06		(48	)	$	19.06		-	$	-		(173	)	$	17.61
Outstanding at December 31, 2013		754		$	19.41		1,028		$	23.02		1,800	$	23.57		3,582		$	22.53
Granted (3)(5)		335		$	36.71		1,091		$	34.23		-	$	-		1,426		$	34.82
Performance adjustment (4)		-		$	-		(139	)	$	31.40		-	$	-		(139	)	$	31.40
Released		(468	)	$	20.36		(304	)	$	18.12		-	$	-		(772	)	$	19.48
Forfeited		(32	)	$	19.75		(17	)	$	19.79		-	$	-		(49	)	$	19.77
Outstanding at December 31, 2014		589		$	28.48		1,659		$	28.11		1,800	$	23.57		4,048		$	26.14

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Outstanding at January 1, 2012		4,863		$	15.31		3.4	$	8,817
Options granted (1)		178		$	15.63
Options exercised		(1,152	)	$	11.62
Options forfeited and expired		(76	)	$	20.90
Outstanding at December 31, 2012		3,813		$	15.62		2.6	$	25,380
Options exercised		(2,446	)	$	15.49
Options forfeited and expired		(11	)	$	15.27
Outstanding at December 31, 2013		1,356		$	15.86		1.9	$	25,506
Options exercised		(742	)	$	16.09
Options forfeited and expired		(24	)	$	10.07
Outstanding at December 31, 2014		590		$	15.80		1.2	$	20,039
Options exercisable at December 31, 2014 and expected to vest		590		$	15.80		1.2	$	20,026
Options exercisable at December 31, 2014		568		$	15.92		1.2	$	19,221

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

		Options Outstanding						Options Exercisable
Range of Exercises Prices		Shares		Weighted- Average Remaining Contractual Term		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
		(in thousands)		(in years)				(in thousands)
$	0.76 - $14.96		118		2.0	$	12.16		98	$	12.07
$	15.03 - $15.03		321		0.8	$	15.03		321	$	15.03
$	15.13 - $23.50		151		1.6	$	20.29		149	$	20.36
			590		1.2	$	15.80		568	$	15.92

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Year Ended
	December 31, 2012
Expected term (years)		4.1
Expected volatility		53.4	%
Risk-free interest rate		0.6	%
Dividend yield		-

	Year Ended December 31,
	2014			2013			2012
Expected term (years)		0.5			0.5			0.5
Expected volatility		29.4	%		28.0	%		45.8	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%
Dividend yield		0.7	%		-			-

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Note 11 - Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2012	Apr. 30, 2011
Note 11 - Income Taxes (Details) [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 19,051,000	$ 16,739,000
Operating Loss Carryforwards	24,500,000	33,200,000
Unrecognized Tax Benefits	16,406,000	14,922,000	13,081,000	12,204,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	4,800,000	5,000,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	500,000	800,000
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority					10,500,000
Domestic Tax Authority [Member] | Exercised Stock Option [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount		4,000,000
Domestic Tax Authority [Member]
Note 11 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	24,500,000
Tax Credit Carryforward, Amount		16,700,000
State and Local Jurisdiction [Member] | Exercised Stock Option [Member]
Note 11 - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount		1,400,000
State and Local Jurisdiction [Member]
Note 11 - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	28,000,000
Tax Credit Carryforward, Amount		14,700,000
Increase In R & D Credits [Member]
Note 11 - Income Taxes (Details) [Line Items]
Federal R&D credit	$ 1,900,000

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Note 8 - Stock Repurchase Program (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Jul. 31, 2013
Disclosure Text Block [Abstract]
Stock Repurchase Program, Authorized Amount		$ 100
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 38.2

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Note 14 - Employee Benefit Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0	$ 0

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Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	$ 282,535,000	$ 238,091,000	$ 213,813,000
Discount rate	9.00%
Scenario, Forecast [Member] | Minimum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	2,100
Scenario, Forecast [Member] | Maximum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	$ 3,800
Minimum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Discount rate	4.00%	3.30%
Probability of occurrence	20.00%
Maximum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Discount rate	7.00%	8.10%
Probability of occurrence	50.00%

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Note 9 - Dividends and Dividend Equivalents (Details) - Quarterly Dividends (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Quarterly Dividends [Abstract]
Dividend Declared per Share	$ 0.15	$ 0.15	$ 0.15
Total Amount	$ 5,826	$ 5,823	$ 5,817

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Note 12 - Commitments and Contingencies (Details) - Commitments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments [Abstract]
2015	$ 1,094
2016	763
2017	297
2018 and thereafter	168
Total	$ 2,322

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Note 11 - Income Taxes (Details) - Components of Income Tax Provision (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal									$ 18	$ 77	$ 840
State									(28)	67	3
Foreign									943	1,053	1,302
Deferred:
Foreign									(36)	(88)	(11)
Total income tax provision	$ 712	$ (573)	$ 502	$ 257	$ 484	$ 1,187	$ (357)	$ (204)	$ 897	$ 1,109	$ 2,134

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Note 12 - Commitments and Contingencies (Details) - Warranty Reserve (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Warranty Reserve [Abstract]
Balance at beginning of period	$ 451	$ 331	$ 561
Warranty provision for product sales	282	476	917
Settlements made	(42)	(117)	(675)
Unused warranty provision	(451)	(239)	(472)
Balance at end of period	$ 240	$ 451	$ 331

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Note 10 - Net Income Per Share (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	2,000	1,100,000

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Note 7 - Stock-Based Compensation (Details) - Summary of Outstanding and Exercisable Options (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Outstanding (in Shares)	590
Weighted-Average Remaining Contractual Term	1 year 73 days
Weighted Average Exercise Price	$ 15.80
Shares Outstanding, Exercisable (in Shares)	568
Weighted Average Exercise Price, Exercisable	$ 15.92
Range 01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercises Prices, Upper	$ 0.76
Range of Exercises Prices, Lower	$ 14.96
Shares Outstanding (in Shares)	118
Weighted-Average Remaining Contractual Term	2 years
Weighted Average Exercise Price	$ 12.16
Shares Outstanding, Exercisable (in Shares)	98
Weighted Average Exercise Price, Exercisable	$ 12.07
Range 02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercises Prices, Upper	$ 15.03
Range of Exercises Prices, Lower	$ 15.03
Shares Outstanding (in Shares)	321
Weighted-Average Remaining Contractual Term	292 days
Weighted Average Exercise Price	$ 15.03
Shares Outstanding, Exercisable (in Shares)	321
Weighted Average Exercise Price, Exercisable	$ 15.03
Range 03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercises Prices, Upper	$ 15.13
Range of Exercises Prices, Lower	$ 23.50
Shares Outstanding (in Shares)	151
Weighted-Average Remaining Contractual Term	1 year 219 days
Weighted Average Exercise Price	$ 20.29
Shares Outstanding, Exercisable (in Shares)	149
Weighted Average Exercise Price, Exercisable	$ 20.36

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Note 17 - Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Comprehensive Income (Loss) Note [Text Block]

17. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (in thousands):

	Unrealized Losses on Auction-Rate Securities			Unrealized Gains (Losses) on Other Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2013	$	(490	)	$	37		$	4,628		$	4,175
Other comprehensive income (loss) before reclassifications		130			(29	)		1,988			2,089
Amounts reclassified from accumulated other comprehensive income		-			(4	)		-			(4	)
Net current period other comprehensive income (loss)		130			(33	)		1,988			2,085
Balance as of December 31, 2013		(360	)		4			6,616			6,260
Other comprehensive income (loss) before reclassifications		179			(17	)		(609	)		(447	)
Amounts reclassified from accumulated other comprehensive income		-			(2	)		-			(2	)
Net current period other comprehensive income (loss)		179			(19	)		(609	)		(449	)
Balance as of December 31, 2014	$	(181	)	$	(15	)	$	6,007		$	5,811

The amounts reclassified from accumulated other comprehensive income were recorded in interest and other income, net, in the Consolidated Statement of Operations.

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Note 3 - Cash, Cash Equivalents and Investments (Details) - Current Assets Reported As (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reported as:
Cash and cash equivalents	$ 126,266	$ 101,213	$ 75,104	$ 96,371
Short-term investments	112,452	125,126
Long-term investments	5,389	9,860
Total	$ 244,107	$ 236,199

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Note 18 - Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Three Months Ended
	March 31, 2014			June 30, 2014		September 30, 2014			December 31, 2014
	(in thousands, except per share amounts)
Revenue	$	60,061		$	68,436	$	78,335		$	75,703
Cost of revenue		27,964			31,337		35,872			34,744
Gross profit		32,097			37,099		42,463			40,959
Operating expenses:
Research and development		15,603			13,368		14,679			14,941
Selling, general and administrative		16,109			16,853		17,006			16,787
Litigation expense (benefit), net		(8,700	)		274		332			66
Total operating expenses		23,012			30,495		32,017			31,794
Income from operations		9,085			6,604		10,446			9,165
Interest and other income, net		190			295		202			407
Income before income taxes		9,275			6,899		10,648			9,572
Income tax provision (benefit)		257			502		(573	)		712
Net income	$	9,018		$	6,397	$	11,221		$	8,860
Net income per share:
Basic	$	0.23		$	0.17	$	0.29		$	0.23
Diluted	$	0.23		$	0.16	$	0.28		$	0.22
Weighted-average shares outstanding:
Basic		38,470			38,684		38,785			38,807
Diluted		39,517			39,608		39,727			40,321
Cash dividends declared per common share	$	-		$	0.15	$	0.15		$	0.15

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenue	$	51,470		$	57,714		$	65,347		$	63,560
Cost of revenue		24,085			26,786			30,053			29,266
Gross profit		27,385			30,928			35,294			34,294
Operating expenses:
Research and development		12,123			12,478			12,643			12,487
Selling, general and administrative		13,258			13,793			13,891			13,683
Litigation expense (benefit), net		(301	)		(257	)		104			84
Total operating expenses		25,080			26,014			26,638			26,254
Income from operations		2,305			4,914			8,656			8,040
Interest and other income (expense), net		(10	)		218			(59	)		(57	)
Income before income taxes		2,295			5,132			8,597			7,983
Income tax provision (benefit)		(204	)		(357	)		1,187			484
Net income	$	2,499		$	5,489		$	7,410		$	7,499
Net income per share:
Basic	$	0.07		$	0.15		$	0.20		$	0.20
Diluted	$	0.07		$	0.14		$	0.19		$	0.19
Weighted-average shares outstanding:
Basic		36,259			37,053			37,910			38,328
Diluted		37,708			38,239			39,009			39,524
Cash dividends declared per common share	$	-		$	-		$	-		$	-

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Note 9 - Dividends and Dividend Equivalents (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended			12 Months Ended
	Dec. 21, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2012
Dividends And Dividend Equivalents [Abstract]
Dividends Payable, Current		$ 5.8			$ 5.8
Dividend Equivalents, Current		0.8			0.8
Common Stock, Dividends, Per Share, Declared (in Dollars per share)		$ 0.15	$ 0.15	$ 0.15	$ 0.45	$ 1.00
Dividends, Common Stock, Cash	$ 35.7

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Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Year Ended December 31,
	2014		2013			2012
United States	$	3,173	$	(2,309	)	$	807
International		33,219		26,316			17,083
Total income before income taxes	$	36,392	$	24,007		$	17,890

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	18		$	77		$	840
State		(28	)		67			3
Foreign		943			1,053			1,302
Deferred:
Foreign		(36	)		(88	)		(11	)
Total income tax provision	$	897		$	1,109		$	2,134

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
U.S. statutory federal tax rate		34.0	%		34.0	%		34.0	%
State, net of federal benefit		-			0.3			-
Research and development credits		(0.3	)		-			(3.6	)
Stock-based compensation		(9.3	)		(13.7	)		0.1
Foreign income at lower rates		(27.7	)		(33.8	)		(28.4	)
Changes in valuation allowance		6.2			16.8			7.0
Litigation reserves and other		(0.4	)		1.0			2.8
Effective tax rate		2.5	%		4.6	%		11.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	As of December 31,
	2014			2013
Deferred tax assets:
Research tax credits	$	10,393		$	8,303
Other expenses not currently deductible		4,861			3,204
Stock-based compensation		4,068			2,599
Litigation settlement		-			2,490
Net operating losses		298			627
Depreciation and amortization		181			291
Total deferred tax assets		19,801			17,514
Valuation allowance		(19,051	)		(16,739	)
Net deferred tax assets	$	750		$	775

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Balance as at January 1, 2012	$	12,204
Gross increase for tax position of prior year		188
Gross increase for tax position of current year		689
Balance as of December 31, 2012		13,081
Gross increase for tax position of prior year		646
Gross increase for tax position of current year		1,528
Reduction for prior year tax position		(333	)
Balance as of December 31, 2013		14,922
Gross increase for tax position of prior year		584
Gross increase for tax position of current year		1,760
Reduction for prior year tax position		(860	)
Balance as of December 31, 2014	$	16,406

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Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]
Adjusted Cost	$ 178,115	$ 173,931
Unrealized Gains	14	26
Unrealized Losses	(210)	(383)
Total Fair Value	177,919	173,574
Fair Value of Investments in Unrealized Loss Position	40,451	52,740
Money Market Funds [Member]
Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]
Adjusted Cost	60,078	35,588
Total Fair Value	60,078	35,588
Certificates of Deposit [Member]
Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]
Adjusted Cost	22,778
Total Fair Value	22,778
US Government Agencies Short-term Debt Securities [Member]
Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]
Adjusted Cost	89,689	128,123
Unrealized Gains	14	26
Unrealized Losses	(29)	(23)
Total Fair Value	89,674	128,126
Fair Value of Investments in Unrealized Loss Position	35,062	42,880
Auction Rate Securities [Member]
Note 3 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items]
Adjusted Cost	5,570	10,220
Unrealized Losses	(181)	(360)
Total Fair Value	5,389	9,860
Fair Value of Investments in Unrealized Loss Position	$ 5,389	$ 9,860

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Note 7 - Stock-Based Compensation (Details) (USD $)	3 Months Ended								12 Months Ended						0 Months Ended	1 Months Ended								4 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 28, 2012	Feb. 28, 2014	Apr. 30, 2014	Apr. 30, 2012	Feb. 28, 2013	Feb. 28, 2012	Feb. 28, 2011	Oct. 31, 2014	Feb. 28, 2015	Jul. 31, 2014	Mar. 31, 2004	Dec. 31, 2012	Nov. 13, 2014
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross									171,000				178,000	[1]
Allocated Share-based Compensation Expense (in Dollars)	$ 14,941,000	$ 14,679,000	$ 13,368,000	$ 15,603,000	$ 12,487,000	$ 12,643,000	$ 12,478,000	$ 12,123,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars)	100,000								100,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									1,426,000	[2],[3]	2,974,000	[2]	1,580,000	[2],[4]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition									1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)									17,300,000		27,800,000		10,000,000
Proceeds from Stock Options Exercised (in Dollars)									11,941,000		37,877,000		13,390,000
Proceeds from Stock Plans (in Dollars)									2,078,000		2,145,000		1,852,000
Restricted Stock Units (RSUs) [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Share Increase Modification Ratio															1.0471
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period															74,000
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost (in Dollars)															1,500,000
Time-Based RSU's and PSUs [Member] | Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																336,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																2 years
Time-Based RSU's and PSUs [Member] | Non-Executive Employees [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																	139,000	345,000
Time-Based RSU's and PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Shares Authorized Not Granted																						674,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)									28,900,000		18,600,000		10,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding (in Dollars)	201,300,000								201,300,000
Share Price (in Dollars per share)	$ 49.74								$ 49.74
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	73,600,000								73,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition									6 years
Time-Based RSUs [Member] | Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																84,000			74,000	206,500
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																2 years			2 years	2 years
Time-Based RSUs [Member] | Non-Executive Employees [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																	78,000	220,000	124,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	4 years	4 years	4 years
Time-Based RSUs [Member] | Chief Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																					153,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																				2 years
Time-Based RSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									335,000	[2],[3]	299,000	[2]	617,000	[2],[4]
PSUs [Member] | Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																252,000			220,000	206,500		212,000
PSUs [Member] | Non-Executive Employees [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																	61,000	125,000	91,000			358,000
Share Based Compensation Arrangement By Share Based Payment Award Award Number Of Consecutive Periods																						5 years
Share-based Compensation Arrangement by Share-based Payment Award Award, Performance Period																						2 years
PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									1,091,000	[2],[3]	875,000	[2]	963,000	[2],[4]
2014 Executive PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																300.00%
2014 Non-Executive PSU's [Member] | Minimum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																	200.00%
2014 Non-Executive PSU's [Member] | Maximum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																	300.00%
2014 Non-Executive PSU's [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																	2 years
Time Base Restricted Unit [Member] | Non-Executive Employees [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																						104,000
2013 MSUs [Member] | Maximum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Maximum					1,800,000						1,800,000
2013 MSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate									38.69%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate									1.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate									0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									720,000		360,000
Share Price (in Dollars per share)	$ 31.73								$ 31.73
2013 Time-Based RSUs and PSUs [Member] | Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																			294,000
2013 Time-Based RSUs and PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																			215,000
2013 Executive PSUs [Member] | Subsequent Event [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																							402,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																							2 years
2013 Executive PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																			300.00%
2013 Non-Executive PSUs [Member] | Subsequent Event [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																							63,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																							2 years
2013 Non-Executive PSUs [Member] | Minimum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																			200.00%
2013 Non-Executive PSUs [Member] | Maximum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																			300.00%
2012 Time-Based RSUs and PSUs [Member] | Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																				413,000
2012 Executive PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																				139,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																				2 years
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																				300.00%
2012 Non-Executive PSUs [Member] | Minimum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																		200.00%
2012 Non-Executive PSUs [Member] | Maximum [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																		300.00%
2012 Non-Executive PSUs [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																								2 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized																30,000
2012 CEO PSUs [Member] | Chief Executive Officer [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Share Based Payment Other Than Options Percentage Allowed																				100.00%
2004 Plan [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Percent Increases In Period																									5.00%
Share Based Compensation Arrangement By Share Based Payment Award Automatic Annual Increase Shares																									2,400,000
Expired Shares Under Plan																									2,900,000
Share Based Compensation Arrangement By Share Based Payment Award Share Increase Modification Ratio															1.0471
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross															171,000
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost (in Dollars)															2,900,000
Allocated Share-based Compensation Expense (in Dollars)																										2,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars)													100,000													100,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term															1 year 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate															41.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate															0.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate															0.00%
2014 Plan [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																											5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,500,000								5,500,000
2004 Employee Stock Purchase Plan [Member]
Note 7 - Stock-Based Compensation (Details) [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Percent Increases In Period									2.00%
Share Based Compensation Arrangement By Share Based Payment Award Automatic Annual Increase Shares									1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	4,700,000								4,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)													100,000													100,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee									2,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee, Value (in Dollars)									25,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans									78,000		111,000		152,000
Stock Issued During Period Shares Employee Stock Purchase Plans Intrinsic Value (in Dollars)									900,000		800,000		1,000,000
Proceeds from Stock Plans (in Dollars)									$ 2,100,000		$ 2,100,000		$ 1,900,000

[1] Includes 171,000 options granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

[2] Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.

[3] Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See "2014 Time-Based RSUs and PSUs" below for further discussion.

[4] Amount includes 74,000 shares granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

XML

Note 5 - Balance Sheet Components (Details) - Other Long-Term Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Long-Term Assets [Abstract]
Deferred compensation plan assets	$ 6,084	$ 607
Prepaid expense	1,418	57
Other	955	980
Total	$ 8,457	$ 1,644

XML

Note 2 - Acquisition (Details) - Supplemental Pro Forma Information (unaudited) (Sensima [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Sensima [Member]
Note 2 - Acquisition (Details) - Supplemental Pro Forma Information (unaudited) [Line Items]
Revenue	$ 282,584	$ 238,181
Net income	$ 33,777	$ 20,187
Diluted net income per share (in Dollars per share)	$ 0.85	$ 0.52

XML

Note 1 - Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business

Monolithic Power Systems, Inc. (“MPS” or the “Company”) was incorporated in the State of California on August 22, 1997. On November 17, 2004, the Company was reincorporated in the State of Delaware. MPS designs, develops and markets integrated power semiconductor solutions and power delivery architectures. MPS's mission is to provide innovative power solutions in cloud computing, telecommunications, industrial and automotive, and consumer market segments.

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of stock-based awards, valuation of goodwill and acquisition-related intangible assets, contingencies and tax valuation allowances. Actual results could differ from those estimates.

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash consists of checking and savings accounts. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments consist primarily of certificates of deposit and government agencies and treasuries and the long-term investments consist of government-backed student loan auction-rate securities. The Company generally does not require its customers to provide collateral or other security to support accounts receivable. To manage credit risk, management performs ongoing credit evaluations of its customers’ financial condition.  The Company requires cash in advance for certain customers in addition to ongoing credit evaluations for those where credit has been extended. Accounts receivable allowances were not material in any periods presented.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company; changes in third-party manufacturers; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in domestic and international economic and/or political regulations; availability of necessary components or subassemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

Foreign Currency  

The functional currency of the Company’s international subsidiaries is primarily the local currency. The majority of the subsidiaries is located in China and Taiwan, which utilize the Renminbi and the New Taiwan Dollar as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are presented as a separate component of accumulated other comprehensive income in stockholders’ equity in the Consolidated Balance Sheets. In addition, the Company incurs foreign currency exchange gains or losses related to the timing of payments for transactions between the U.S. and its subsidiaries. Foreign currency transaction gains (losses) are reported in interest and other income, net, in the Consolidated Statements of Operations and totaled $0.1 million, $(0.6) million and $(0.1) million for the years ended December 31, 2014, 2013 and 2012, respectively.

Cash and Cash Equivalents 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents.

Fair Value of Financial Instruments

Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1: Quoted prices in active markets for identical assets

Level 2: Significant other observable inputs

Level 3: Significant unobservable inputs

The Company’s financial instruments include cash and cash equivalents, short-term and long-term investments. Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term investments are classified as available-for-sale securities and are stated at their fair market value.

The Company determines whether an impairment is temporary or other-than temporary. Unrealized gains or losses that are deemed to be temporary are recorded as a component of accumulated other comprehensive income in stockholder’s equity in the Consolidated Balance Sheets, and changes in unrealized gains or losses are recorded in the Consolidated Statements of Comprehensive Income. The Company records an impairment charge in interest and other income, net, in the Consolidated Statements of Operations when an available-for-sale investment has experienced a decline in value that is deemed to be other-than-temporary. Other-than-temporary impairment exists when the Company either has the intent to sell the security, it will more likely than not be required to sell the security before anticipated recovery, or it does not expect to recover the entire amortized cost basis of the security.

At December 31, 2014, the fair value of the Company’s holdings in auction-rate securities was $5.4 million, all of which was classified as long-term available-for-sale investments. The valuation of the auction-rate securities is subject to fluctuations in the future, which will depend on many factors, including the quality of the underlying collateral, estimated time to liquidity including potential to be called or restructured, underlying final maturity, insurance guaranty and market conditions, among others.

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) or current market value. The Company writes down excess and obsolete inventory based on its age and forecasted demand, which includes estimates taking into consideration the Company’s outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand and such differences may have a material effect on recorded inventory values. Inventory write-downs are not reversed until the related inventories have been sold.

Property and Equipment

Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have a depreciation life of 30 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful life or the lease period.  Computer, software and equipment have a depreciation life of three to seven years. Transportation equipment has a depreciate life of 5 to 15 years. Furniture and fixtures have a depreciation life of three to five years.

Goodwill and Acquisition-Related Intangible Assets

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. In-process research and development (“IPR&D”) assets represent the fair value of incomplete R&D projects that had not reached technological feasibility as of the date of acquisition. The IPR&D assets are initially capitalized at fair value as intangible assets with indefinite lives. When the IPR&D projects are completed, they are reclassified as amortizable intangible assets and are amortized over their estimated useful lives. Alternatively, if the IPR&D projects are abandoned, they are impaired and expensed to research and development.

Acquisition-related intangible assets with finite lives consist of know-how and developed technologies. These assets are amortized on a straight-line basis over estimated useful lives ranging from three to five years and the amortization expense is recorded in cost of revenue in the Consolidated Statements of Operations.

Other Long-Term Assets

Other assets primarily consist of intangible assets for the land use rights in Chengdu, China, purchased patents, long-term lease deposits and deferred compensation plan investments. We amortize the land use rights over 50 years and the purchased patents over five years.

Impairment of Long-Lived Assets

The Company evaluates long-lived assets, other than goodwill and acquisition-related intangible assets with indefinite useful lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows.

The Company tests goodwill for impairment at least annually, or whenever events or changes in circumstances indicate that the goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that its fair value is less than the carrying amount, then the two-step goodwill impairment test is performed. The first step compares the fair value of the reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step measures the impairment loss by comparing the implied fair value of the goodwill with the carrying amount. As of December 31, 2014, no impairment of goodwill has been identified. 

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive management, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

The liabilities for compensation deferred under the plan are recorded at fair value in each reporting period and are included in other long-term liabilities in the Consolidated Balance Sheets. Changes in the fair value of the liabilities are recorded as an operating expense (credit) in the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments that offset a substantial portion of the exposure. The investments are recorded in other long-term assets in the Consolidated Balance Sheets at the cash surrender value of the corporate-owned life insurance policies and at the fair value of the mutual fund investments, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund investments are included in interest and other income, net in the Consolidated Statements of Operations. As of December 31, 2014 and 2013, the plan assets totaled $6.1 million and $0.6 million, and the plan liabilities totaled $6.2 million and $0.6 million, respectively.

Warranty Reserves

The Company generally provides a one to two-year warranty against defects in materials and workmanship and will either repair the goods or provide replacement products at no charge to the customer for defective products. Reserve requirements are recorded in the period of sale and are based on an assessment of the products sold with warranty and historical warranty costs incurred. Historically, the warranty expenses have not been material to the Company’s consolidated financial statements. 

Revenue Recognition

The Company recognizes revenue when the following four basic criteria are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Determination of criteria (3) and (4) are based on management’s judgment regarding the fixed nature of the fees charged for products delivered and the collectability of those fees. The application of these criteria has resulted in the Company generally recognizing revenue upon shipment (when title passes) to customers, including distributors, original equipment manufacturers and electronic manufacturing service providers.

The Company’s revenue consists primarily of sales of assembled and tested finished goods. The Company also sells die in wafer form to its customers and value-added resellers, and the Company receives royalty revenue from third parties and value-added resellers.

For the years ended December 31, 2014 and 2013, approximately 92% and 91% of the Company’s distributor sales, respectively, including sales to the Company’s value-added resellers, were made through distribution arrangements with third parties. These arrangements do not include any special payment terms (the Company’s normal payment terms are 30-45 days for its distributors), price protection or exchange rights. Returns are limited to the Company’s standard product warranty. Certain of the Company’s large distributors have contracts that include limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases.

For the years ended December 31, 2014 and 2013, approximately 8% and 9% of the Company’s distributor sales, respectively, were made through small distributors primarily based on purchase orders. These distributors typically have no stock rotation rights.

The Company generally recognizes revenue upon shipment of products to the distributors for the following reasons:

(1)	The price is fixed or determinable at the date of sale. The Company does not offer special payment terms, price protection or price adjustments to distributors when the Company recognizes revenue upon shipment.
(2)	The distributors are obligated to pay the Company and this obligation is not contingent on the resale of the Company’s products.
(3)	The distributors’ obligation is unchanged in the event of theft or physical destruction or damage to the products.
(4)	The distributors have stand-alone economic substance apart from the Company’s relationship.
(5)	The Company does not have any obligations for future performance to directly bring about the resale of its products by the distributors.
(6)	The amount of future returns can be reasonably estimated. The Company has the ability and the information necessary to track inventory sold to and held at its distributors. The Company maintains a history of returns and has the ability to estimate the stock rotation returns on a quarterly basis.

The Company maintains a sales reserve for stock rotation rights, which is based on historical experience of actual stock rotation returns on a per distributor basis, where available, and information related to products in the distribution channel. This reserve is recorded at the time of sale. Historically, these returns were not material to the Company’s consolidated financial statements.  

If the Company enters into arrangements that have rights of return that are not estimable, the Company recognizes revenue under such arrangements only after the distributors have sold the products to end customers. Three of the Company’s U.S. distributors have distribution agreements where revenue is recognized upon sale by these distributors to their end customers because these distributors have certain rights of return which management believes are not estimable. The deferred revenue balance from these distributors as of December 31, 2014 and 2013 was $2.0 million and $1.7 million, respectively. The deferred costs as of December 31, 2014 and 2013 were $0.2 million.

Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The Company uses the Black-Scholes model to estimate the fair value of its options and shares issued under employee stock purchase plan. The fair value of time-based and performance-based restricted stock units is based on the grant date share price. The fair value of market-based restricted stock units is estimated using a Monte Carlo simulation model.

The Company recognizes compensation expense equal to the grant-date fair value for all share-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire awards, unless the awards are subject to performance or market conditions, in which case the Company recognizes compensation expense over the requisite service period of each separate vesting tranche. For the performance-based awards, the Company recognizes compensation expense when it becomes probable that the performance criteria set by the Board of Directors will be achieved. For the market-based awards, compensation expense is not reversed if the market condition is not satisfied. The amount of stock-based compensation that the Company recognizes is based on an expected forfeiture rate. If there is a difference between the forfeiture assumptions used in determining stock-based compensation costs and the actual forfeitures which become known over time, the Company may change the forfeiture rate, which could have a significant impact on its stock-based compensation expense.

Research and Development

Costs incurred in research and development are expensed as incurred.

Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments primarily related to transfer pricing, cost sharing and its international tax structure exposure.

Contingencies

The Company is a party to actions and proceedings incident to its business in the ordinary course of business, including litigation regarding the Company’s intellectual property, challenges to the enforceability or validity of its intellectual property and claims that its products infringe on the intellectual property rights of others. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

Litigation Expense (Benefit)

The Company records litigation costs in the period in which they are incurred. Due to the uncertainties inherent in litigation proceedings, the Company generally recognizes the proceeds resulting from settlement of litigation or favorable judgments when the cash is received and there is no further contingency related to the litigation. The proceeds are recorded as a reduction against litigation expense to the extent that litigation costs were previously incurred in the related case. Proceeds in excess of cumulative costs incurred for the case is recorded in interest and other income, net, in the Consolidated Statements of Operations. Litigation expense (benefit), net, includes primarily patent litigation and other contract-related matters.

Comprehensive Income

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive income presented in the Consolidated Balance Sheets primarily consists of unrealized gains and losses related to available-for-sale investments and foreign currency translation adjustments.

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard gives guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists, with the purpose of reducing diversity in practice. This new standard requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. The Company adopted this standard in the first quarter of 2014 prospectively and the adoption did not have an impact on its consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Under the new standard, entities will apply the following five-step model when evaluating revenue contracts with customers:

(1) Identify the contract with a customer.

(2) Identify the performance obligations in the contract.

(3) Determine the transaction price.

(4) Allocate the transaction price to the performance obligations in the contract.

(5) Recognize revenue when the entity satisfies a performance obligation.

The new standard is effective for annual and interim reporting periods beginning after December 15, 2016. Entities have the option of using either a full retrospective or a modified retrospective application in the adoption of this standard. The Company will adopt the standard in the first quarter of 2017 and is evaluating the transition method and the impact of the adoption on its consolidated financial position, results of operations and cash flows.

XML

Note 5 - Balance Sheet Components (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	$ 14,703	$ 17,376
Proceeds From Litigation [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities		9,489
Dividends and Dividend Equivalents [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	6,080
Deferred Revenue And Customer Prepayments [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	3,908	2,523
Stock Rotation Reserve [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	1,757	1,459
Commissions [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	767	931
Sales Rebate [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	586	900
Warranty [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	240	451
Other Liability [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	$ 1,365	$ 1,623

XML

Note 1 - Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Available-for-sale Securities (in Dollars)	$ 177,919,000	$ 173,574,000
Deferred Compensation Plan Assets (in Dollars)	6,084,000	607,000
Deferred Compensation Liability, Current and Noncurrent (in Dollars)	6,200,000	600,000
Number Of Distributors Having Distribution Agreements	3
Auction Rate Securities [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Available-for-sale Securities (in Dollars)	5,400,000
Interest And Other Income [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax (in Dollars)	100,000	600,000	100,000
Building and Building Improvements [Member] | Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Building and Building Improvements [Member] | Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Computer Equipment [Member] | Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment [Member] | Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Transportation Equipment [Member] | Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Transportation Equipment [Member] | Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Furniture and Fixtures [Member] | Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Third Parties [Member] | Sales Revenue, Goods, Net [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Percentof Distributor Sales	92.00%	91.00%
Small Distributors [Member] | Sales Revenue, Goods, Net [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Percentof Distributor Sales	8.00%	9.00%
Three U.S. Distributors [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Deferred Revenue (in Dollars)	2,000,000	1,700,000
Deferred Costs, Current (in Dollars)	$ 200,000	$ 200,000
Know-How And Developed Technologies [Member] | Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Know-How And Developed Technologies [Member] | Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Land Use Rights [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	50 years
Patents [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Extended Product Warranty Term	1 year
Maximum [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]
Extended Product Warranty Term	2 years

XML

Note 3 - Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	As of December 31,
	2014		2013
Cash, cash equivalents and investments:
Cash	$	66,188	$	62,625
Money market funds		60,078		35,588
Certificates of deposit		22,778		-
U.S. treasuries and government agency bonds		89,674		128,126
Auction-rate securities backed by student-loan notes		5,389		9,860
Total	$	244,107	$	236,199

Schedule of Other Current Assets [Table Text Block]

	As of December 31,
	2014		2013
Reported as:
Cash and cash equivalents	$	126,266	$	101,213
Short-term investments		112,452		125,126
Long-term investments		5,389		9,860
Total	$	244,107	$	236,199

Investments Classified by Contractual Maturity Date [Table Text Block]

	As of December 31,
	2014		2013
Due in less than 1 year	$	91,335	$	95,509
Due in 1 - 5 years		21,117		29,617
Due in greater than 5 years		5,389		9,860
Total	$	117,841	$	134,986

Unrealized Gain (Loss) on Investments [Table Text Block]

	As of December 31, 2014
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	60,078	$	-	$	-		$	60,078	$	-
Certificates of deposit		22,778		-		-			22,778		-
U.S. treasuries and government agency bonds		89,689		14		(29	)		89,674		35,062
Auction-rate securities backed by student-loan notes		5,570		-		(181	)		5,389		5,389
Total	$	178,115	$	14	$	(210	)	$	177,919	$	40,451

	As of December 31, 2013
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	35,588	$	-	$	-		$	35,588	$	-
U.S. treasuries and government agency bonds		128,123		26		(23	)		128,126		42,880
Auction-rate securities backed by student-loan notes		10,220		-		(360	)		9,860		9,860
Total	$	173,931	$	26	$	(383	)	$	173,574	$	52,740

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Note 2 - Acquisition (Tables)

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]

Cash paid at the Acquisition Date	$	11,735
Contingent consideration		2,507
Total	$	14,242

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Cash	$	145
Other tangible assets acquired, net of liabilities assumed		42
Intangible assets:
Know-how		1,018
Developed technologies		4,421
IPR&D		2,045
Total identifiable net assets acquired		7,671
Goodwill		6,571
Total net assets acquired	$	14,242

Business Acquisition, Pro Forma Information [Table Text Block]

	Year Ended December 31,
	2014		2013
Revenue	$	282,584	$	238,181
Net income	$	33,777	$	20,187
Diluted net income per share	$	0.85	$	0.52

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Note 4 - Fair Value Measurement (Details) - Discounted Cash Flow Assumptions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Time-to-liquidity (months)	24	24
Expected return	2.90%	2.50%
Discount rate	9.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	3.30%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	7.00%	8.10%

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Note 2 - Acquisition (Details) (USD $)	12 Months Ended						1 Months Ended	0 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Jul. 22, 2014	Dec. 28, 2012	Jul. 30, 2014
Note 2 - Acquisition (Details) [Line Items]
Business Combination, Contingent Consideration, Liability	$ 2,507,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	1,426,000	[1],[2]	2,974,000	[1]	1,580,000	[1],[3]
Restricted Stock Units (RSUs) [Member] | Former Sensima Employees [Member]
Note 2 - Acquisition (Details) [Line Items]
Stock Granted, Value, Share-based Compensation, Gross							1,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)							40,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							4 years
Restricted Stock Units (RSUs) [Member]
Note 2 - Acquisition (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)								74,000
Phantom Share Units (PSUs) [Member] | Former Sensima Employees [Member]
Note 2 - Acquisition (Details) [Line Items]
Stock Granted, Value, Share-based Compensation, Gross							2,000,000
Performance Share Units [Member] | Remaining Half of RSU Awards [Member] | Former Sensima Employees [Member]
Note 2 - Acquisition (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							2 years
Performance Share Units [Member] | Former Sensima Employees [Member]
Note 2 - Acquisition (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)							47,000
Maximum PSU Earn Out							8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							50.00%
Sensima [Member] | Minimum [Member]
Note 2 - Acquisition (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life							3 years
Sensima [Member] | Maximum [Member]
Note 2 - Acquisition (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life							5 years
Sensima [Member]
Note 2 - Acquisition (Details) [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Escrow Deposit							1,200,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High							8,900,000		8,900,000
Business Combination, Contingent Consideration, Liability	2,507,000						2,500,000		2,500,000
Business Combination, Acquisition Related Costs							$ 600,000

[1] Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.

[2] Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See "2014 Time-Based RSUs and PSUs" below for further discussion.

[3] Amount includes 74,000 shares granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

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Note 4 - Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurement at December 31, 2014
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	60,078	$	60,078	$	-	$	-
Certificates of deposit		22,778		-		22,778		-
U.S. treasuries and government agency bonds		89,674		-		89,674		-
Auction-rate securities backed by student-loan notes		5,389		-		-		5,389
Mutual funds under deferred compensation plan		2,236		2,236		-		-
Total	$	180,155	$	62,314	$	112,452	$	5,389
Liabilities:
Contingent consideration	$	2,507	$	-	$	-	$	2,507
Total	$	2,507	$	-	$	-	$	2,507

	Fair Value Measurement at December 31, 2013
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	35,588	$	35,588	$	-	$	-
U.S. treasuries and government agency bonds		128,126		-		128,126		-
Auction-rate securities backed by student-loan notes		9,860		-		-		9,860
Total	$	173,574	$	35,588	$	128,126	$	9,860

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at January 1, 2013	$	11,755
Sales and settlement at par		(2,025	)
Change in unrealized loss included in other comprehensive income		130
Ending balance at December 31, 2013		9,860
Sales and settlement at par		(4,650	)
Change in unrealized loss included in other comprehensive income		179
Ending balance at December 31, 2014	$	5,389

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	As of December 31,
	2014		2013
Time-to-liquidity (months)		24		24
Expected return		2.9%		2.5%
Discount rate		4.0% - 7.0%		3.3% - 8.1%

Schedule of Net Benefit Costs [Table Text Block]

	As of December 31,
	2014
Project revenue in 2016 (in millions)		$2.1 - $3.8
Discount rate		9.0%
Probability of occurrence		20% - 50%

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Note 5 - Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Schedule of Inventory, Current [Table Text Block]

	As of December 31,
	2014		2013
Raw materials	$	7,298	$	12,453
Work in process		18,950		14,152
Finished goods		14,670		13,132
Total	$	40,918	$	39,737

Property, Plant and Equipment [Table Text Block]

	As of December 31,
	2014			2013
Production equipment and software	$	88,929		$	83,075
Buildings and improvements		29,386			29,342
Land		5,600			5,600
Transportation equipment		4,694			976
Furniture and fixtures		2,883			2,681
Leasehold improvements		2,350			2,150
Property and equipment, gross		133,842			123,824
Less: accumulated depreciation and amortization		(70,900	)		(58,987	)
Total	$	62,942		$	64,837

Schedule of Other Assets, Noncurrent [Table Text Block]

	As of December 31,
	2014		2013
Deferred compensation plan assets	$	6,084	$	607
Prepaid expense		1,418		57
Other		955		980
Total	$	8,457	$	1,644

Schedule of Accrued Liabilities [Table Text Block]

	As of December 31,
	2014		2013
Deferred proceeds from litigation	$	-	$	9,489
Dividends and dividend equivalents		6,080		-
Deferred revenue and customer prepayments		3,908		2,523
Stock rotation reserve		1,757		1,459
Commissions		767		931
Sales rebate		586		900
Warranty		240		451
Other		1,365		1,623
Total	$	14,703	$	17,376

Schedule of Other Assets and Other Liabilities [Table Text Block]

	As of December 31,
	2014		2013
Deferred compensation plan liabilities	$	6,177	$	628
Contingent consideration		2,507		-
Dividend equivalents		580		-
Other		940		850
Total	$	10,204	$	1,478

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 35,495	$ 22,898	$ 15,756
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of tangible and intangible assets	13,130	12,160	9,332
Loss on disposal of property and equipment		31	81
Amortization and realized gains/losses on investments	96	443	214
Deferred taxes, net	17	(81)	(8)
Excess tax benefit from equity awards	(10)		(869)
Stock-based compensation	33,454	20,701	18,652
Changes in operating assets and liabilities, net of effects of an acquisition:
Accounts receivable	(1,870)	(4,347)	(4,286)
Inventories	(1,142)	(7,606)	(12,004)
Prepaid expenses and other assets	(2,029)	121	(456)
Accounts payable	1,632	1,440	754
Accrued liabilities	(3,102)	12,149	(2,097)
Tax liabilities	(248)	86	1,476
Accrued compensation and related benefits	(1,290)	2,691	(1,633)
Net cash provided by operating activities	74,133	60,686	24,912
Cash flows from investing activities:
Property and equipment purchases	(9,511)	(15,764)	(21,059)
Proceeds from sale of property and equipment		88	13
Purchases of short-term investments	(136,872)	(125,756)	(143,094)
Proceeds from sale of short-term investments	149,291	85,700	135,183
Proceeds from sale of long-term investments	4,650	2,025	2,100
Premiums paid on deferred compensation plan	(5,335)	(617)
Change in restricted assets			20
Cash paid for an acquisition, net of cash acquired	(11,590)
Net cash used in investing activities	(9,367)	(54,324)	(26,837)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(400)	(557)
Proceeds from exercise of stock options	11,941	37,877	13,390
Proceeds from shares issued under the employee stock purchase plan	2,078	2,145	1,852
Repurchases of common shares	(41,198)	(20,615)
Dividends and dividend equivalents paid	(11,658)		(35,664)
Excess tax benefits from equity awards	10		869
Net cash provided by (used in) financing activities	(39,227)	18,850	(19,553)
Effect of change in exchange rates	(486)	897	211
Net increase (decrease) in cash and cash equivalents	25,053	26,109	(21,267)
Cash and cash equivalents, beginning of period	101,213	75,104	96,371
Cash and cash equivalents, end of period	126,266	101,213	75,104
Supplemental disclosures for cash flow information:
Cash paid for taxes	1,235	1,116	807
Supplemental disclosures of non-cash investing and financing activities:
Liability accrued for property and equipment purchases	1,487	1,941	1,728
Liability accrued for dividends and dividend equivalents	6,660
Sensima [Member]
Supplemental disclosures of non-cash investing and financing activities:
Fair value of contingent consideration related to an acquisition	$ 2,507

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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

	As of December 31, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Subject to amortization:
Know-how	$	1,018	$	(93	)	$	925
Developed technologies		4,421		(579	)		3,842
Not subject to amortization:
IPR&D		2,045		-			2,045
Total	$	7,484	$	(672	)	$	6,812

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

2015	$	1,467
2016		1,467
2017		1,467
2018 and thereafter		366
Total	$	4,767

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Note 11 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Research tax credits	$ 10,393	$ 8,303
Other expenses not currently deductible	4,861	3,204
Stock-based compensation	4,068	2,599
Litigation settlement		2,490
Net operating losses	298	627
Depreciation and amortization	181	291
Total deferred tax assets	19,801	17,514
Valuation allowance	(19,051)	(16,739)
Net deferred tax assets	$ 750	$ 775

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Note 16 - Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Year Ended December 31,
Country or Region	2014		2013		2012
China	$	181,050	$	141,400	$	124,278
Taiwan		38,460		34,248		27,477
Europe		19,830		15,351		16,201
Korea		14,362		9,992		9,434
Southeast Asia		13,993		21,760		21,641
Japan		8,251		7,495		8,516
United States		6,392		7,525		5,711
Other		197		320		555
Total	$	282,535	$	238,091	$	213,813

Revenue from External Customers by Products and Services [Table Text Block]

	Year Ended December 31,
Product Family	2014		2013		2012
DC to DC products	$	253,083	$	211,337	$	188,736
Lighting control products		29,452		26,754		25,077
Total	$	282,535	$	238,091	$	213,813

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	As of December 31,
Country	2014		2013
China	$	37,147	$	41,557
United States		33,913		24,719
Bermuda		13,383		-
Other		339		205
Total	$	84,782	$	66,481

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Note 4 - Fair Value Measurement (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Jul. 30, 2014	Jul. 22, 2014
Note 4 - Fair Value Measurement (Details) [Line Items]
Business Combination, Contingent Consideration, Liability	$ 2,507,000
Sensima [Member]
Note 4 - Fair Value Measurement (Details) [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		8,900,000	8,900,000
Business Combination, Contingent Consideration, Liability	2,507,000	2,500,000	2,500,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 0

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Note 7 - Stock-Based Compensation (Details) - Valuation Assumptions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
2004 Employee Stock Plan [Member]
Note 7 - Stock-Based Compensation (Details) - Valuation Assumptions [Line Items]
Expected term (years)	6 months	6 months	4 years 36 days
Expected volatility	29.40%	28.00%	53.40%
Risk-free interest rate	0.10%	0.10%	0.60%
Dividend yield	0.70%
Employee Stock Option [Member]
Note 7 - Stock-Based Compensation (Details) - Valuation Assumptions [Line Items]
Expected term (years)			6 months
Expected volatility			45.80%
Risk-free interest rate			0.10%

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 126,266	$ 101,213
Short-term investments	112,452	125,126
Accounts receivable, net	25,630	23,730
Inventories	40,918	39,737
Prepaid expenses and other current assets	2,880	2,280
Total current assets	308,146	292,086
Property and equipment, net	62,942	64,837
Long-term investments	5,389	9,860
Goodwill	6,571
Acquisition-related intangible assets, net	6,812
Deferred tax assets, net	1,049	481
Other long-term assets	8,457	1,644
Total assets	399,366	368,908
Current liabilities:
Accounts payable	13,138	10,694
Accrued compensation and related benefits	9,020	10,419
Accrued liabilities	14,703	17,376
Total current liabilities	36,861	38,489
Deferred tax and other tax liabilities	5,876	5,542
Other long-term liabilities	10,204	1,478
Total liabilities	52,941	45,509
Commitments and contingencies (notes 11, 12 and 13)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 38,832 and 38,291 as of December 31, 2014 and December 31, 2013, respectively	240,500	234,201
Retained earnings	100,114	82,938
Accumulated other comprehensive income	5,811	6,260
Total stockholders’ equity	346,425	323,399
Total liabilities and stockholders’ equity	$ 399,366	$ 368,908

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Note 2 - Acquisition (Details) - Fair Value of Purchase Consideration (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Jul. 30, 2014	Jul. 22, 2014
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration	$ 2,507
Sensima [Member]
Business Acquisition, Contingent Consideration [Line Items]
Cash paid at the Acquisition Date	11,735
Contingent consideration	2,507	2,500	2,500
Total	$ 14,242

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Note 18 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Quarterly Financial Data [Abstract]
Revenue	$ 75,703	$ 78,335	$ 68,436	$ 60,061	$ 63,560	$ 65,347	$ 57,714	$ 51,470	$ 282,535	$ 238,091	$ 213,813
Cost of revenue	34,744	35,872	31,337	27,964	29,266	30,053	26,786	24,085	129,917	110,190	100,665
Gross profit	40,959	42,463	37,099	32,097	34,294	35,294	30,928	27,385	152,618	127,901	113,148
Operating expenses:
Research and development	14,941	14,679	13,368	15,603	12,487	12,643	12,478	12,123
Selling, general and administrative	16,787	17,006	16,853	16,109	13,683	13,891	13,793	13,258	66,755	54,624	50,018
Litigation expense (benefit), net	66	332	274	(8,700)	84	104	(257)	(301)
Total operating expenses	31,794	32,017	30,495	23,012	26,254	26,638	26,014	25,080	117,318	103,986	95,869
Income from operations	9,165	10,446	6,604	9,085	8,040	8,656	4,914	2,305	35,300	23,915	17,279
Interest and other income, net	407	202	295	190	(57)	(59)	218	(10)
Income before income taxes	9,572	10,648	6,899	9,275	7,983	8,597	5,132	2,295	36,392	24,007	17,890
Income tax provision (benefit)	712	(573)	502	257	484	1,187	(357)	(204)	897	1,109	2,134
Net income	$ 8,860	$ 11,221	$ 6,397	$ 9,018	$ 7,499	$ 7,410	$ 5,489	$ 2,499	$ 35,495	$ 22,898	$ 15,756
Net income per share:
Basic (in Dollars per share)	$ 0.23	$ 0.29	$ 0.17	$ 0.23	$ 0.20	$ 0.20	$ 0.15	$ 0.07	$ 0.92	$ 0.61	$ 0.45
Diluted (in Dollars per share)	$ 0.22	$ 0.28	$ 0.16	$ 0.23	$ 0.19	$ 0.19	$ 0.14	$ 0.07	$ 0.89	$ 0.59	$ 0.43
Weighted-average shares outstanding:
Basic (in Shares)	38,807	38,785	38,684	38,470	38,328	37,910	37,053	36,259
Diluted (in Shares)	40,321	39,727	39,608	39,517	39,524	39,009	38,239	37,708	39,793	38,620	36,247
Cash dividends declared per common share (in Dollars per share)	$ 0.15	$ 0.15	$ 0.15						$ 0.45		$ 1.00

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Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Auction Rate Securities [Member]
Change in unrealized losses on securities, tax	$ 0	$ 0	$ 0
Available-for-sale Securities [Member]
Change in unrealized losses on securities, tax	$ 0	$ 0	$ 0

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Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]
Long lived assets by region	$ 84,782	$ 66,481
CHINA
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]
Long lived assets by region	37,147	41,557
UNITED STATES
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]
Long lived assets by region	33,913	24,719
BERMUDA
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]
Long lived assets by region	13,383
Other Region [Member]
Note 16 - Segment and Geographic Information (Details) - Long Lived Assets By Geographic Region [Line Items]
Long lived assets by region	$ 339	$ 205

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Note 5 - Balance Sheet Components (Details) - Inventories (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials	$ 7,298	$ 12,453
Work in process	18,950	14,152
Finished goods	14,670	13,132
Total	$ 40,918	$ 39,737

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Note 9 - Dividends and Dividend Equivalents (Tables)

12 Months Ended

Dec. 31, 2014

Dividends And Dividend Equivalents [Abstract]

Schedule of Dividends Payable [Table Text Block]

	Dividend Declared		Total
	per Share		Amount
Second quarter	$	0.15	$	5,817
Third quarter	$	0.15	$	5,823
Fourth quarter	$	0.15	$	5,826

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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) - Acquisition-Related Intangible Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Subject to amortization:
Accumulated Amortization	$ (672)
Net Amount	4,767
Not subject to amortization:
Total	7,484
Total	(672)
Total	6,812
IPR&D [Member]
Not subject to amortization:
IPR&D	2,045
Know-How [Member]
Subject to amortization:
Gross Amount	1,018
Accumulated Amortization	(93)
Net Amount	925
Not subject to amortization:
Total	(93)
Developed Technology Rights [Member]
Subject to amortization:
Gross Amount	4,421
Accumulated Amortization	(579)
Net Amount	3,842
Not subject to amortization:
Total	$ (579)

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Note 14 - Employee Benefit Plan

12 Months Ended

Dec. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

14.  EMPLOYEE BENEFIT PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the United States who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan in 2014, 2013 and 2012.

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Note 10 - Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	35,495	$	22,898	$	15,756
Denominator:
Weighted-average outstanding shares used to compute basic net income per share		38,686		37,387		34,871
Effect of dilutive securities		1,107		1,233		1,376
Weighted-average outstanding shares used to compute diluted net income per share		39,793		38,620		36,247
Net income per share:
Basic	$	0.92	$	0.61	$	0.45
Diluted	$	0.89	$	0.59	$	0.43

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Note 16 - Segment and Geographic Information

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

16.  SEGMENT AND GEOGRAHPIC INFORMATION 

The Company operates in one reportable segment that includes the design, development, marketing and sale of high-performance, mixed-signal analog semiconductors for the communications, storage and computing, consumer and industrial markets. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis. The Company derives a majority of its revenue from sales to customers located outside North America, with geographic revenue based on the customers’ ship-to locations.

The following is a summary of revenue by geographic regions (in thousands):

	Year Ended December 31,
Country or Region	2014		2013		2012
China	$	181,050	$	141,400	$	124,278
Taiwan		38,460		34,248		27,477
Europe		19,830		15,351		16,201
Korea		14,362		9,992		9,434
Southeast Asia		13,993		21,760		21,641
Japan		8,251		7,495		8,516
United States		6,392		7,525		5,711
Other		197		320		555
Total	$	282,535	$	238,091	$	213,813

The following is a summary of revenue by product family (in thousands):

	Year Ended December 31,
Product Family	2014		2013		2012
DC to DC products	$	253,083	$	211,337	$	188,736
Lighting control products		29,452		26,754		25,077
Total	$	282,535	$	238,091	$	213,813

The following is a summary of long-lived assets by geographic regions (in thousands):

	As of December 31,
Country	2014		2013
China	$	37,147	$	41,557
United States		33,913		24,719
Bermuda		13,383		-
Other		339		205
Total	$	84,782	$	66,481

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Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]
Share based compensation expense	$ 14,941	$ 14,679	$ 13,368	$ 15,603	$ 12,487	$ 12,643	$ 12,478	$ 12,123
Total									33,454	20,701	18,465
Cost of Sales [Member]
Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]
Share based compensation expense									903	631	510
Research and Development Expense [Member]
Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]
Share based compensation expense									9,019	6,219	6,922
Selling, General and Administrative Expenses [Member]
Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]
Share based compensation expense									23,532	13,851	11,220
Tax Benefit [Member]
Note 7 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses [Line Items]
Share based compensation expense											$ (187)

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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance as of January 1, 2012 at Dec. 31, 2011	$ 159,336	$ 79,948	$ 3,593	$ 242,877
Balance as of January 1, 2012 (in Shares) at Dec. 31, 2011	33,826,000
Net income		15,756		15,756
Other comprehensive income			582	582
Dividends		(35,664)		(35,664)
Exercise of stock options and related tax benefits	14,232			14,232
Exercise of stock options and related tax benefits (in Shares)	1,152,000			1,152,000
Shares issued under the employee stock purchase plan	1,852			1,852
Shares issued under the employee stock purchase plan (in Shares)	152,000
Stock-based compensation expense	18,659			18,659
Release of restricted stock (in Shares)	543,000
Balance as of at Dec. 31, 2012	194,079	60,040	4,175	258,294
Balance as of (in Shares) at Dec. 31, 2012	35,673,000
Net income		22,898		22,898
Other comprehensive income			2,085	2,085
Exercise of stock options and related tax benefits	37,877			37,877
Exercise of stock options and related tax benefits (in Shares)	2,446,000			2,446,000
Repurchase of common shares	(20,615)			(20,615)
Repurchase of common shares (in Shares)	(664,000)
Shares issued under the employee stock purchase plan	2,145			2,145
Shares issued under the employee stock purchase plan (in Shares)	111,000
Stock-based compensation expense	20,715			20,715
Release of restricted stock (in Shares)	725,000
Balance as of at Dec. 31, 2013	234,201	82,938	6,260	323,399
Balance as of (in Shares) at Dec. 31, 2013	38,291,000			38,291,000
Net income		35,495		35,495
Other comprehensive income			(449)	(449)
Dividends		(18,319)		(18,319)
Exercise of stock options and related tax benefits	11,960			11,960
Exercise of stock options and related tax benefits (in Shares)	742,000			742,000
Repurchase of common shares	(41,198)			(41,198)
Repurchase of common shares (in Shares)	(1,051,000)
Shares issued under the employee stock purchase plan	2,078			2,078
Shares issued under the employee stock purchase plan (in Shares)	78,000
Stock-based compensation expense	33,459			33,459
Release of restricted stock (in Shares)	772,000
Balance as of at Dec. 31, 2014	$ 240,500	$ 100,114	$ 5,811	$ 346,425
Balance as of (in Shares) at Dec. 31, 2014	38,832,000			38,832,000

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Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	38,832	38,291
Common stock, shares outstanding	38,832	38,291

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Note 9 - Dividends and Dividend Equivalents

12 Months Ended

Dec. 31, 2014

Dividends And Dividend Equivalents [Abstract]

Dividends And Dividend Equivalents [Text Block]

9. DIVIDENDS AND DIVIDEND EQUIVALENTS

2014 Cash Dividend Program

In June 2014, the Board of Directors approved a dividend program pursuant to which the Company intends to pay quarterly cash dividends on its common stock. Stockholders of record as of the last day of the quarter are entitled to receive the quarterly cash dividends declared by the Board of Directors, which are payable on the 15th of the following month. The Board of Directors declared the following cash dividends in 2014 (in thousands, except per-share amounts):

	Dividend Declared		Total
	per Share		Amount
Second quarter	$	0.15	$	5,817
Third quarter	$	0.15	$	5,823
Fourth quarter	$	0.15	$	5,826

As of December 31, 2014, accrued dividends totaled $5.8 million.

The declaration of any future cash dividends is at the discretion of the Board of Directors and will depend on the Company's financial condition, results of operations, capital requirements, business conditions and other factors, as well as a determination that cash dividends are in the best interests of the Company's stockholders. The Company anticipates that the cash used for future dividends will come from its current domestic cash and cash generated from ongoing U.S. operations. If cash held by the Company’s international subsidiaries is needed for the payment of dividends, the Company may be required to accrue and pay U.S. taxes to repatriate the funds.

Cash Dividend Equivalents

Beginning in June 2014, outstanding RSU awards contain rights to receive cash dividend equivalents under the Company’s stock plans, which entitle employees who hold RSUs to the same dividend value per share as holders of common stock. The dividend equivalents are accrued quarterly during the vesting periods of the RSUs and payable to the employees when the awards vest. Dividend equivalents accrued on the outstanding RSUs are forfeited if the employees do not fulfill their service requirement during the vesting periods. As of December 31, 2014, accrued dividend equivalents totaled $0.8 million.

2012 Special Cash Dividend

In December 2012, the Board of Directors declared a special cash dividend of $1.00 per common share, which was paid on December 28, 2012 to all stockholders of record as of the close of business on December 21, 2012, for a total of $35.7 million.  

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Note 16 - Segment and Geographic Information (Details) - Revenue By Product Family (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Product family	$ 282,535,000	$ 238,091,000	$ 213,813,000
DC To DC Products [Member]
Revenue from External Customer [Line Items]
Product family	253,083,000	211,337,000	188,736,000
Lighting Control Products [Member]
Revenue from External Customer [Line Items]
Product family	$ 29,452,000	$ 26,754,000	$ 25,077,000

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Note 16 - Segment and Geographic Information (Details)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Number of Reportable Segments	1

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Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	MONOLITHIC POWER SYSTEMS INC
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		39,290,882
Entity Public Float			$ 946,000,000
Amendment Flag	false
Entity Central Index Key	0001280452
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

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Note 10 - Net Income Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

10.   NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share reflects the potential dilution that would occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock, and calculated using the treasury stock method.

Beginning in June 2014, the Company’s outstanding RSU awards contain forfeitable rights to receive cash dividend equivalents, which are accrued quarterly during the vesting periods of the RSUs and payable to the employees when the awards vest. Dividend equivalents accrued on outstanding RSUs are forfeited if the employees do not fulfill their service requirement during the vesting periods. Accordingly, these awards are not treated as participating securities in the net income per share calculation.

The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):

	Year Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	35,495	$	22,898	$	15,756
Denominator:
Weighted-average outstanding shares used to compute basic net income per share		38,686		37,387		34,871
Effect of dilutive securities		1,107		1,233		1,376
Weighted-average outstanding shares used to compute diluted net income per share		39,793		38,620		36,247
Net income per share:
Basic	$	0.92	$	0.61	$	0.45
Diluted	$	0.89	$	0.59	$	0.43

For the year ended December 31, 2014, there were no anti-dilutive common stock equivalents. For the years ended December 31, 2013 and 2012, approximately 2,000 and 1.1 million weighted-average common stock equivalents, respectively, were excluded from the calculation of diluted net income per share because their inclusion would have been anti-dilutive.

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Note 11 - Income Taxes (Details) - Components of Income Before Income Tax (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Before Income Tax [Abstract]
United States									$ 3,173	$ (2,309)	$ 807
International									33,219	26,316	17,083
Total income before income taxes	$ 9,572	$ 10,648	$ 6,899	$ 9,275	$ 7,983	$ 8,597	$ 5,132	$ 2,295	$ 36,392	$ 24,007	$ 17,890

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Note 15 - Significant Customers (Details) - Summary of Major Customers	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Distributor A [Member] | Sales Revenue, Goods, Net [Member]
Revenue, Major Customer [Line Items]
Distributor	26.00%		32.00%	32.00%
Distributor A [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Distributor	31.00%		32.00%
Distributor B [Member] | Sales Revenue, Goods, Net [Member]
Revenue, Major Customer [Line Items]
Distributor		[1]	10.00%		[1]
Distributor B [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Distributor	10.00%		17.00%

[1] Represents less than 10%.

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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue	$ 282,535	$ 238,091	$ 213,813
Cost of revenue	129,917	110,190	100,665
Gross profit	152,618	127,901	113,148
Operating expenses:
Research and development	58,590	49,733	48,796
Selling, general and administrative	66,755	54,624	50,018
Litigation benefit, net	(8,027)	(371)	(2,945)
Total operating expenses	117,318	103,986	95,869
Income from operations	35,300	23,915	17,279
Interest and other income, net	1,092	92	611
Income before income taxes	36,392	24,007	17,890
Income tax provision	897	1,109	2,134
Net income	$ 35,495	$ 22,898	$ 15,756
Net income per share:
Basic (in Dollars per share)	$ 0.92	$ 0.61	$ 0.45
Diluted (in Dollars per share)	$ 0.89	$ 0.59	$ 0.43
Weighted-average shares outstanding:
Basic (in Shares)	38,686	37,387	34,871
Diluted (in Shares)	39,793	38,620	36,247
Cash dividends declared per common share (in Dollars per share)	$ 0.45		$ 1.00

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Note 4 - Fair Value Measurement

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

4. FAIR VALUE MEASUREMENT

The following table details the fair value measurement of the financial assets and liabilities (in thousands):

	Fair Value Measurement at December 31, 2014
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	60,078	$	60,078	$	-	$	-
Certificates of deposit		22,778		-		22,778		-
U.S. treasuries and government agency bonds		89,674		-		89,674		-
Auction-rate securities backed by student-loan notes		5,389		-		-		5,389
Mutual funds under deferred compensation plan		2,236		2,236		-		-
Total	$	180,155	$	62,314	$	112,452	$	5,389
Liabilities:
Contingent consideration	$	2,507	$	-	$	-	$	2,507
Total	$	2,507	$	-	$	-	$	2,507

	Fair Value Measurement at December 31, 2013
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	35,588	$	35,588	$	-	$	-
U.S. treasuries and government agency bonds		128,126		-		128,126		-
Auction-rate securities backed by student-loan notes		9,860		-		-		9,860
Total	$	173,574	$	35,588	$	128,126	$	9,860

The Company’s level 3 assets consist of government-backed student loan auction-rate securities, with interest rates that reset through a Dutch auction every 7 to 35 days and which became illiquid in 2008. The following table provides a rollforward of the fair value of the auction-rate securities (in thousands):

Balance at January 1, 2013	$	11,755
Sales and settlement at par		(2,025	)
Change in unrealized loss included in other comprehensive income		130
Ending balance at December 31, 2013		9,860
Sales and settlement at par		(4,650	)
Change in unrealized loss included in other comprehensive income		179
Ending balance at December 31, 2014	$	5,389

The Company determined the fair value of the auction-rate securities using a discounted cash flow model with the following assumptions:

	As of December 31,
	2014		2013
Time-to-liquidity (months)		24		24
Expected return		2.9%		2.5%
Discount rate		4.0% - 7.0%		3.3% - 8.1%

The Company’s level 3 liabilities consist of the contingent consideration related to the acquisition of Sensima in July 2014. The arrangement requires the Company to pay up to $8.9 million to certain former Sensima shareholders if Sensima achieves a new product introduction as well as certain product revenue and direct margin targets in 2016. The fair value of the contingent consideration at the Acquisition Date was $2.5 million, which was estimated based on a probability-weighted analysis of possible future cash flow outcomes. There were no significant changes in the fair value of the contingent consideration from the Acquisition Date to December 31, 2014. The fair value is calculated using the following assumptions:

	As of December 31,
	2014
Project revenue in 2016 (in millions)		$2.1 - $3.8
Discount rate		9.0%
Probability of occurrence		20% - 50%

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Note 3 - Cash, Cash Equivalents and Investments

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Cash, Cash Equivalents, and Marketable Securities [Text Block]

3.  CASH, CASH EQUIVALENTS AND INVESTMENTS

The following is a summary of the Company’s cash, cash equivalents, and short-term and long-term investments (in thousands):

	As of December 31,
	2014		2013
Cash, cash equivalents and investments:
Cash	$	66,188	$	62,625
Money market funds		60,078		35,588
Certificates of deposit		22,778		-
U.S. treasuries and government agency bonds		89,674		128,126
Auction-rate securities backed by student-loan notes		5,389		9,860
Total	$	244,107	$	236,199

	As of December 31,
	2014		2013
Reported as:
Cash and cash equivalents	$	126,266	$	101,213
Short-term investments		112,452		125,126
Long-term investments		5,389		9,860
Total	$	244,107	$	236,199

The contractual maturities of the Company’s short-term and long-term available-for-sale investments are as follows (in thousands):

	As of December 31,
	2014		2013
Due in less than 1 year	$	91,335	$	95,509
Due in 1 - 5 years		21,117		29,617
Due in greater than 5 years		5,389		9,860
Total	$	117,841	$	134,986

The following tables summarize unrealized gains and losses related to the Company's investments in marketable securities designated as available-for sale (in thousands):

	As of December 31, 2014
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	60,078	$	-	$	-		$	60,078	$	-
Certificates of deposit		22,778		-		-			22,778		-
U.S. treasuries and government agency bonds		89,689		14		(29	)		89,674		35,062
Auction-rate securities backed by student-loan notes		5,570		-		(181	)		5,389		5,389
Total	$	178,115	$	14	$	(210	)	$	177,919	$	40,451

	As of December 31, 2013
	Adjusted Cost		Unrealized Gains		Unrealized Losses			Total Fair Value		Fair Value of Investments in Unrealized Loss Position
Money market funds	$	35,588	$	-	$	-		$	35,588	$	-
U.S. treasuries and government agency bonds		128,123		26		(23	)		128,126		42,880
Auction-rate securities backed by student-loan notes		10,220		-		(360	)		9,860		9,860
Total	$	173,931	$	26	$	(383	)	$	173,574	$	52,740

For the years ended December 31, 2014 and 2013, the Company redeemed $4.7 million and $2.0 million, respectively, of auction-rate securities at par. The underlying maturities of the outstanding auction-rate securities are up to 33 years. As of December 31, 2014 and 2013, the impairment was determined to be temporary based on the following management assessment:

(1) The decline in the fair value of these securities is not largely attributable to adverse conditions specifically related to these securities or to specific conditions in an industry or in a geographic area;

(2)	Management possesses both the intent and ability to hold these securities for a period of time sufficient to allow for any anticipated recovery in fair value;
(3)	Management believes that it is more likely than not that the Company will not have to sell these securities before recovery of its cost basis;
(4)	Except for the credit loss of $70,000 recognized in the year ended December 31, 2009, the Company does not believe that there is any additional credit loss associated with these securities because the Company expects to recover the entire amortized cost basis;
(5)	There have been no further downgrades on these securities since 2009;
(6)	All scheduled interest payments have been made pursuant to the reset terms and conditions; and
(7)	All redemptions of these securities to date, representing 87% of the original portfolio, have been at par.

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Note 15 - Significant Customers

12 Months Ended

Dec. 31, 2014

Risks and Uncertainties [Abstract]

Concentration Risk Disclosure [Text Block]

15.  SIGNIFICANT CUSTOMERS

The Company sells its products primarily through third-party distributors, value-added resellers and directly to original equipment manufacturers, original design manufacturers, and electronic manufacturing service providers. The following table summarizes those customers with sales greater than 10% of the Company's total revenue or accounts receivable balances greater than 10% of the Company’s total accounts receivable: 

	Revenue									Accounts Receivable
	Year Ended December 31,									As of December 31,
Customers	2014			2013			2012			2014			2013
Distributor A		26	%		32	%		32	%		31	%		32	%
Distributor B		*			10	%		*			10	%		17	%

____________

* Represents less than 10%.

Both of the customers are third-party distributors. The Company’s agreements with these distributors were made in the ordinary course of business and may be terminated with or without cause by either party with advance notice. Although the Company may experience a short-term disruption in the distribution of its products and a short-term decline in revenue if its agreement with either of these distributors was terminated, the Company believes that such termination would not have a material adverse effect on its financial statements because it would be able to engage alternative distributors, resellers and other distribution channels to deliver its products to end customers within a few quarters following the termination of any agreement with a distributor.

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Note 11 - Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

11.  INCOME TAXES

The components of income (loss) before income taxes are as follows (in thousands):

	Year Ended December 31,
	2014		2013			2012
United States	$	3,173	$	(2,309	)	$	807
International		33,219		26,316			17,083
Total income before income taxes	$	36,392	$	24,007		$	17,890

Management’s intent is to indefinitely reinvest any undistributed earnings from its foreign subsidiaries. Accordingly, no provision for Federal and state income or foreign withholding taxes has been provided thereon, nor is it practical to determine the amount of this liability. Upon distribution of those earnings in the form of dividends or otherwise, the Company will be subject to U.S. income taxes and potential foreign withholding taxes. As of December 31, 2014 and 2013, the unremitted earnings of foreign subsidiaries were $172.7 million and $141.0 million, respectively. The Company has sufficient cash reserves in the U.S. and intends to use the undistributed foreign earnings to fund foreign operations and research and development needs, planned capital outlay and expansion.

The components of the income tax provision are as follows (in thousands):

	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	18		$	77		$	840
State		(28	)		67			3
Foreign		943			1,053			1,302
Deferred:
Foreign		(36	)		(88	)		(11	)
Total income tax provision	$	897		$	1,109		$	2,134

The effective tax rate differs from the applicable U.S. statutory federal income tax rate as follows:

	Year Ended December 31,
	2014			2013			2012
U.S. statutory federal tax rate		34.0	%		34.0	%		34.0	%
State, net of federal benefit		-			0.3			-
Research and development credits		(0.3	)		-			(3.6	)
Stock-based compensation		(9.3	)		(13.7	)		0.1
Foreign income at lower rates		(27.7	)		(33.8	)		(28.4	)
Changes in valuation allowance		6.2			16.8			7.0
Litigation reserves and other		(0.4	)		1.0			2.8
Effective tax rate		2.5	%		4.6	%		11.9	%

The components of net deferred tax assets consist of the following (in thousands):

	As of December 31,
	2014			2013
Deferred tax assets:
Research tax credits	$	10,393		$	8,303
Other expenses not currently deductible		4,861			3,204
Stock-based compensation		4,068			2,599
Litigation settlement		-			2,490
Net operating losses		298			627
Depreciation and amortization		181			291
Total deferred tax assets		19,801			17,514
Valuation allowance		(19,051	)		(16,739	)
Net deferred tax assets	$	750		$	775

As a result of the cost sharing arrangements with the Company’s international subsidiaries (cost share arrangements), relatively small changes in costs that are not subject to sharing under the cost share arrangements can significantly impact the overall profitability of the U.S. entity. Because of the U.S. entity’s inconsistent earnings history and uncertainty of future earnings, the Company has determined that it is more likely than not that the U.S. deferred tax benefits would not be realized. The Company will continue to evaluate if its facts and circumstances warrant a reversal of the valuation allowance against the U.S. deferred tax benefits in future periods. 

As of December 31, 2014 and 2013, the Company had a valuation allowance of $19.1 million and $16.7 million, respectively, attributable to management’s determination that it is more likely than not that most of the deferred tax assets in the U.S. will not be realized. Should it be determined that additional amounts of the net deferred tax asset will not be realized in the future, an adjustment to increase the deferred tax asset valuation allowance will be charged to income in the period such determination is made. Likewise, in the event the Company were to determine that it is more likely than not that it would be able to realize its deferred tax assets in the future in excess of its net recorded amount, an adjustment to the valuation allowance for the deferred tax asset would increase income in the period such determination was made.

As of December 31, 2014, the federal and state net operating loss carryforwards for income tax purposes were approximately $24.5 million and $33.2 million, respectively. The federal net operating loss carryforwards will begin to expire in 2027 and the state net operating loss carry forwards will expire beginning in 2018. $24.5 million of the federal net operating loss carry forwards and $28.0 million of the state operating loss carry forwards are related to excess tax benefits as a result of stock option exercises and therefore will be recorded in additional paid-in-capital in the period that they become realized. The Company has elected to follow the “with and without” approach to account for excess tax benefits from stock options exercises. In addition, the Company only considers the direct effects of stock option exercises when calculating the amount of windfalls or shortfalls.

As of December 31, 2014, the Company had research tax credit carryforwards of $16.7 million for federal income tax purposes, which will begin to expire in 2020, and $14.7 million for state income tax purposes, which can be carried forward indefinitely. $4.0 million of the federal research tax credit and $1.4 million of the state research tax credit carryovers are related to excess tax benefits as a result of stock option exercises and therefore will be recorded in additional-paid-in-capital in the period that they become realized.

In December 2014, the President signed into law The Tax Increase Prevention Act of 2014 (the “2014 Act”).  Under prior law, a taxpayer was entitled to a research credit for qualifying amounts paid or incurred on or before December 31, 2013. The 2014 Act extends the research credit to December 31, 2014. As a result of the retroactive extension, the Company had an increase to its federal R&D credits of approximately $1.9 million for qualifying amounts incurred in 2014. However, due to the Company’s current valuation allowance position, the credit did not result in a tax benefit.

In the event of a change in ownership, as defined under federal and state tax laws, the Company's net operating loss and tax credit carryforwards could be subject to annual limitations.  The annual limitations could result in the expiration of the net operating loss and tax credit carryforwards prior to utilization.

At December 31, 2014, the Company had $16.4 million of unrecognized tax benefits, $4.8 million of which would affect its effective tax rate if recognized after considering the valuation allowance. At December 31, 2013, the Company had $14.9 million of unrecognized tax benefits, $5.0 million of which would affect its effective tax rate if recognized after considering the valuation allowance.

 A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):

Balance as at January 1, 2012	$	12,204
Gross increase for tax position of prior year		188
Gross increase for tax position of current year		689
Balance as of December 31, 2012		13,081
Gross increase for tax position of prior year		646
Gross increase for tax position of current year		1,528
Reduction for prior year tax position		(333	)
Balance as of December 31, 2013		14,922
Gross increase for tax position of prior year		584
Gross increase for tax position of current year		1,760
Reduction for prior year tax position		(860	)
Balance as of December 31, 2014	$	16,406

The Company recognizes interest and penalties, if any, related to uncertain tax positions in its income tax provision. As of December 31, 2014 and 2013, the Company has approximately $0.5 million and $0.8 million, respectively, of accrued interest related to uncertain tax positions, which were recorded in long-term income tax liabilities in the Consolidated Balance Sheets.

Uncertain tax positions relate to the allocation of income and deductions among the Company’s global entities and to the determination of the research and development tax credit. It is reasonably possible that over the next twelve-month period, the Company may experience increases or decreases in its unrecognized tax benefits. However, it is not possible to determine either the magnitude or the range of increases or decreases at this time.

In Switzerland where the Company designs and sells certain of its products, the Company’s earnings are currently subject to a tax holiday.  The tax holiday is currently being reviewed for an extension through 2018 by local Swiss tax authorities. The benefit resulting from the tax holiday had an insignificant impact on earnings per share for the year ended December 31, 2014.

On September 13, 2013, the U.S. Treasury Department and the IRS issued final regulations that address costs incurred in acquiring, producing, or improving tangible property (the "tangible property regulations"). The tangible property regulations are effective for tax years beginning on or after January 1, 2014. Given its full valuation allowance, the regulations did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.

Income Tax Audits

The Company is subject to examination of its income tax returns by the IRS and other tax authorities. The Company’s U.S. Federal income tax returns for the years ended December 31, 2005 through December 31, 2007 are under examination by the IRS. In April 2011, the Company received from the IRS a Notice of Proposed Adjustment ("NOPA") relating to a cost-sharing agreement entered into by the Company and its international subsidiaries on January 1, 2004. In the NOPA, the IRS objected to the Company’s allocation of certain litigation expenses between the Company and its international subsidiaries and the amount of "buy-in payments" made by the international subsidiaries to the Company in connection with the cost-sharing agreement, and proposed to increase the Company’s U.S. taxable income according to a few alternative methodologies. In February 2012, the Company received a revised NOPA from the IRS (“Revised NOPA”). In this Revised NOPA, the IRS raised the same issues as in the NOPA issued in April 2011 but under a different methodology. Under the Revised NOPA, the largest potential federal income tax payment, if the IRS were to prevail on all matters in dispute, is $10.5 million, plus interest and penalties, if any. The Company responded to the IRS Revised NOPA in May 2012. In June 2013, the IRS responded and continued to disagree with the Company’s rebuttal. The Company met with the IRS Office of Appeals in 2014, had additional discussions again in 2015, and both parties have been in continuous discussions for a resolution of the matter. However, there is no guarantee these discussions will be conclusive. Meanwhile, the Company agreed to grant the IRS an extension of the statute of limitations for taxable years 2005 through 2007 to September 30, 2015. 

The IRS also audited the research and development credits carried forward into year 2005 and the credits generated in the years 2005 through 2007. The Company received a NOPA from the IRS in February 2011, proposing to reduce the research and development credits generated in years 2005 through 2007 and the carryforwards, which would then reduce the value of such credits carried forward to subsequent tax years.

The Company reviewed and responded to the above proposed adjustments. The Company regularly assesses the likelihood of an adverse outcome resulting from such examinations to determine the adequacy of its provision for income taxes. As of December 31, 2014, based on the technical merits of its tax return filing positions and the interactions to date with the IRS, the Company believes that it is more-likely-than-not that the resolution of the audits will not have a material impact on its consolidated financial position, results of operations and cash flows.

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Note 11 - Income Taxes (Details) - Unrecognized Tax Benefits Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized Tax Benefits Reconciliation [Abstract]
Balance as at January 1, 2012	$ 14,922	$ 13,081	$ 12,204
Balance as of December 31	16,406	14,922	13,081
Gross increase for tax position of prior year	584	646	188
Gross increase for tax position of current year	1,760	1,528	689
Reduction for prior year tax position	$ (860)	$ (333)

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Note 7 - Stock-Based Compensation

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

7.  STOCK-BASED COMPENSATION

2004 Equity Incentive Plan (the “2004 Plan”)

The Board of Directors adopted the 2004 Plan in March 2004, and the stockholders approved it in November 2004. The 2004 Plan provided for annual increases in the number of shares available for issuance equal to the least of 5% of the outstanding shares of common stock on the first day of the year, 2.4 million shares, or a number of shares determined by the Board of Directors. The 2004 Plan expired on November 12, 2014 and equity awards can no longer be granted under the 2004 Plan. As of November 12, 2014, 2.9 million shares that were available for issuance expired under the 2004 Plan.

2014 Equity Incentive Plan (the “2014 Plan”)

The Board of Directors adopted the 2014 Plan in April 2013, and the stockholders approved it in June 2013. The 2014 Plan became effective on November 13, 2014. The 2014 Plan provides for the issuance of up to 5.5 million shares and will expire on November 13, 2024. As of December 31, 2014, 5.5 million shares remained available for future issuance.

Stock-Based Compensation Expense

The Company recognized stock-based compensation expense as follows (in thousands):

	Year Ended December 31,
	2014		2013		2012
Cost of revenue	$	903	$	631	$	510
Research and development		9,019		6,219		6,922
Selling, general and administrative		23,532		13,851		11,220
Tax benefit		-		-		(187	)
Total	$	33,454	$	20,701	$	18,465

Equity Award Modifications

In connection with a special cash dividend declared and paid in December 2012, the Board of Directors approved an equity award modification whereby the number of shares of each option outstanding as of December 28, 2012 was increased by a ratio of 1.0471 and the exercise price was reduced by the same ratio. Consequently, the Company granted an additional 171,000 shares. This modification was permissible pursuant to the Company’s 2004 Plan and resulted in an incremental compensation cost of $2.9 million, of which $2.8 million was recognized during the fourth quarter of 2012. The remaining $0.1 million is being recognized over the remaining vesting period of the awards. The Company used the Black-Scholes model to determine the fair value of the additional option awards with the following weighted-average assumptions: expected term of 1.9 years, expected volatility of 41.0%, risk-free interest rate of 0.3% and dividend yield of 0.0%.

In addition, in connection with the special cash dividend, the Board of Directors approved an equity award modification whereby for each unvested restricted stock unit (“RSU”) as of December 28, 2012, the holder would receive 1.0471 shares upon vesting of the original awards granted. Consequently, the Company granted an additional 74,000 shares. This modification was permissible pursuant to the Company’s 2004 Plan and resulted in an incremental compensation cost of $1.5 million, which is being recognized over the remaining vesting period of the awards. The fair value of the additional RSUs was based on the grant date share price.

RSUs

The Company’s RSUs include time-based RSUs, performance-based RSUs (“PSUs”) and market-based RSUs (“MSUs”). A summary of the RSUs is presented in the table below:

	Time-Based RSUs			Weighted- Average Grant Date Fair Value Per Share		PSUs			Weighted- Average Grant Date Fair Value Per Share		MSUs		Weighted- Average Grant Date Fair Value Per Share		Total			Weighted- Average Grant Date Fair Value Per Share
	(in thousands)					(in thousands)					(in thousands)				(in thousands)
Outstanding at January 1, 2012		1,082		$	16.00		217		$	20.73		-	$	-		1,299		$	16.87
Modification (1)		(76	)	$	15.69		76		$	15.69		-	$	-		-		$	-
Granted (2)(3)		617		$	18.69		963		$	18.24		-	$	-		1,580		$	18.42
Performance adjustment (4)		-		$	-		(624	)	$	18.19		-	$	-		(624	)	$	18.19
Released		(447	)	$	17.30		(97	)	$	20.73		-	$	-		(544	)	$	17.91
Forfeited		(77	)	$	16.61		(4	)	$	19.07		-	$	-		(81	)	$	16.74
Outstanding at December 31, 2012		1,099		$	16.96		531		$	18.49		-	$	-		1,630		$	17.46
Granted (3)		299		$	24.25		875		$	24.43		1,800	$	23.57		2,974		$	23.89
Performance adjustment (4)		-		$	-		(124	)	$	21.98		-	$	-		(124	)	$	21.98
Released		(519	)	$	17.57		(206	)	$	18.90		-	$	-		(725	)	$	17.95
Forfeited		(125	)	$	17.06		(48	)	$	19.06		-	$	-		(173	)	$	17.61
Outstanding at December 31, 2013		754		$	19.41		1,028		$	23.02		1,800	$	23.57		3,582		$	22.53
Granted (3)(5)		335		$	36.71		1,091		$	34.23		-	$	-		1,426		$	34.82
Performance adjustment (4)		-		$	-		(139	)	$	31.40		-	$	-		(139	)	$	31.40
Released		(468	)	$	20.36		(304	)	$	18.12		-	$	-		(772	)	$	19.48
Forfeited		(32	)	$	19.75		(17	)	$	19.79		-	$	-		(49	)	$	19.77
Outstanding at December 31, 2014		589		$	28.48		1,659		$	28.11		1,800	$	23.57		4,048		$	26.14

 _________________

(1) See “2011 and 2012 CEO Awards” below for further discussion.

(2) Amount includes 74,000 shares granted as a result of the equity award modification. See “Equity Award Modifications” above for further discussion.

(3) Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.

(4) Amount reflects the number of PSUs that have not been earned or may not be earned based on management’s probability assessment.

(5) Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See “2014 Time-Based RSUs and PSUs” below for further discussion.

The intrinsic value related to awards released for the years ended December 31, 2014, 2013 and 2012 was $28.9 million, $18.6 million and $10.5 million, respectively. As of December 31, 2014, the total intrinsic value of outstanding awards was $201.3 million, based on the closing stock price of $49.74. As of December 31, 2014, unamortized compensation expense related to outstanding awards was approximately $73.6 million with a weighted-average remaining recognition period of approximately six years.

2014 Time-Based RSUs and PSUs:

In February 2014, the Board of Directors granted 336,000 shares to executive officers. These grants included 84,000 shares of time-based RSUs which vest over two years on a quarterly basis, and 252,000 shares of PSUs which represent a target number of RSUs to be awarded based on the Company’s achievement of an average two-year (2014 and 2015) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as determined by the Semiconductor Industry Association (“2014 Executive PSUs”). The maximum number of 2014 Executive PSUs that an executive officer can ultimately earn is 300% of the target shares. Half of the 2014 Executive PSUs will vest in February 2016 if the pre-determined performance goals are met and approved by the Compensation Committee. The remaining shares will vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In April 2014, the Board of Directors granted 139,000 shares to non-executive employees. These grants included 78,000 shares of time-based RSUs which vest over four years on an annual or quarterly basis, and 61,000 shares of PSUs which represent a target number of RSUs to be awarded based on the Company’s achievement of 2015 revenue goals for certain regions or product line divisions, or the Company’s achievement of an average two-year (2014 and 2015) revenue growth rate compared against the analog industry’s average two-year revenue growth rate as determined by the Semiconductor Industry Association (“2014 Non-Executive PSUs”). The maximum number of 2014 Non-Executive PSUs that an employee can ultimately earn is either 200% or 300% of the target shares, depending on the job classifications of the employees. Half of the 2014 Non-Executive PSUs will vest in the second quarter of 2016 if the pre-determined performance goals are met and approved by the Compensation Committee. The remaining shares will vest over the following two years on an annual or quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In connection with the acquisition of Sensima in July 2014, the Board of Directors granted time-based RSUs and PSUs to key Sensima employees who became employees of the Company. See Note 2 for further discussion.

In October 2014, the Board of Directors approved 212,000 shares of PSUs to executive officers with a two-year performance period that will begin in 2015.  In addition, the Board of Directors approved 358,000 shares of PSUs to non-executive employees with five consecutive two-year performance periods that will begin in 2015 and end in 2020.  The performance metrics for all of the PSUs will be defined by the Board of Directors at the inception of each performance period. The shares were reserved from the 2004 Plan prior to its expiration in November 2014. The shares will be subject to adjustments at the discretion of the Board of Directors at the inception of each performance period. The Company will determine the grant date fair value of these awards and begin recognizing the related expense when the performance metrics are approved by the Board of Directors and the awards are communicated to the employees at the inception of each performance period.

In October 2014, the Board of Directors approved 104,000 shares of time-based RSUs to non-executive employees with vesting period that will begin in 2015. The shares were reserved from the 2004 Plan prior to its expiration in November 2014.  The Company will determine the grant date fair value of these awards and begin recognizing the related expense when the awards are communicated to the employees in 2015.

2013 MSUs:

In December 2013, the Board of Directors granted 360,000 shares to the executive officers and certain key employees. The MSUs represent the right to receive a maximum of 1.8 million shares that can be earned upon achievement of five pre-determined MPS stock price hurdles from January 1, 2014 to December 31, 2018 (“2013 MSUs”). The 2013 MSUs that meet the pre-determined stock price hurdles from January 1, 2014 to December 31, 2018 will vest quarterly from January 1, 2019 to December 31, 2023, subject to the employees’ continued employment with the Company. In 2014, the Company achieved three price hurdles, and the Compensation Committee approved an additional 720,000 shares to the employees.

The Company determined the grant date fair value of the 2013 MSUs using a Monte Carlo simulation model with the following assumptions: grant date stock price of $31.73, expected volatility of 38.69%, risk-free interest rate of 1.6% and dividend yield of 0.0%. Stock-based compensation expense for the 2013 MSUs is not reversed if the pre-determined stock price hurdles are not satisfied.

2013 Time-Based RSUs and PSUs:

In February 2013, the Board of Directors granted 294,000 shares to the executive officers. These grants included 74,000 shares of time-based RSUs which vested over two years on a quarterly basis, and 220,000 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets in 2014 (“2013 Executive PSUs”). The maximum number of 2013 Executive PSUs that an executive officer could receive was 300% of the target shares. In February 2015, the Compensation Committee approved the revenue achievement for the 2013 Executive PSUs and an additional 402,000 shares were awarded to the executive officers. Half of the 2013 Executive PSUs vested in February 2015 and the remaining shares vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In February 2013, the Board of Directors granted 215,000 shares to non-executive employees. These grants included 124,000 shares of time-based RSUs which vest over four years on a quarterly or annual basis, and 91,000 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets for the Company as a whole, certain regions or product-line divisions in 2014 (“2013 Non-Executive PSUs”). The maximum number of 2013 Non-Executive PSUs an employee could receive was either 200% or 300% of the target shares, depending on the job classifications of the employees. In February 2015, the Compensation Committee approved the revenue achievement for the 2013 Non-Executive PSUs and an additional 63,000 shares were awarded to the employees. Half of the 2013 Non-Executive PSUs vested in February 2015 and the remaining shares vest over the following two years on a quarterly or annual basis. The vesting is subject to the employees’ continued employment with the Company.

 2012 Time-Based RSUs and PSUs:

In February 2012, the Board of Directors granted 413,000 shares to the executive officers. These grants included 206,500 shares of time-based RSUs which vested over two years on a quarterly basis, and 206,500 shares of PSUs which represented a target number of RSUs that would be awarded upon achievement of certain pre-determined revenue targets in 2013 (“2012 Executive PSUs”). The maximum number of 2012 Executive PSUs that an executive officer could receive was 300% of the target shares. In February 2014, the Compensation Committee approved the revenue achievement for the 2012 Executive PSUs and an additional 139,000 shares were awarded to the executive officers. Half of the 2012 Executive PSUs vested in February 2014 and the remaining shares vest over the following two years on a quarterly basis. The vesting is subject to the employees’ continued employment with the Company.

In April 2012, the Board granted 345,000 shares to non-executive employees. These grants included 220,000 shares of time-based RSUs which vest over four years on a quarterly or annual basis, and 125,000 shares of PSUs which represented a target number of shares that would be awarded upon achievement of certain pre-determined revenue targets for the Company as a whole, certain regions or product-line divisions in 2013 (“2012 Non-Executive PSUs”). The maximum number of shares an employee could receive was either 200% or 300% of the target shares, depending on the job classifications of the employees. In April 2014, the Compensation Committee approved the revenue achievement for the 2012 Non-Executive PSUs and an additional 30,000 shares were awarded to the employees. Half of the 2012 Non-Executive PSUs vested in the second quarter of 2014 and the remaining shares vest over the following two years on a quarterly or annual basis. The vesting is subject to the employees’ continued employment with the Company.

2011 and 2012 CEO Awards:

In February 2011, the Board of Directors granted 153,000 shares of time-based RSUs to the CEO. In February 2012, the Board of Directors approved the modification of half of the time-based RSUs to PSUs (“2012 CEO PSUs”). The time-based RSUs that were not modified vested over two years on a quarterly basis from February 2011 to February 2013. The 2012 CEO PSUs would vest upon achievement of the pre-determined performance goals based on the Company’s 2012 revenue and the CEO’s continued employment. The maximum number of 2012 CEO PSUs that could be released was 100% of the target shares. In February 2013, the Compensation Committee determined that the pre-determined performance goals were met and the 2012 CEO PSUs were released in February 2013.  

Stock Options 

A summary of the stock options activities is presented in the table below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Outstanding at January 1, 2012		4,863		$	15.31		3.4	$	8,817
Options granted (1)		178		$	15.63
Options exercised		(1,152	)	$	11.62
Options forfeited and expired		(76	)	$	20.90
Outstanding at December 31, 2012		3,813		$	15.62		2.6	$	25,380
Options exercised		(2,446	)	$	15.49
Options forfeited and expired		(11	)	$	15.27
Outstanding at December 31, 2013		1,356		$	15.86		1.9	$	25,506
Options exercised		(742	)	$	16.09
Options forfeited and expired		(24	)	$	10.07
Outstanding at December 31, 2014		590		$	15.80		1.2	$	20,039
Options exercisable at December 31, 2014 and expected to vest		590		$	15.80		1.2	$	20,026
Options exercisable at December 31, 2014		568		$	15.92		1.2	$	19,221

_______________________  

(1) Includes 171,000 options granted as a result of the equity award modification. See “Equity Award Modifications” above for further discussion.

The following table summarizes certain information related to outstanding and exercisable options as of December 31, 2014:

		Options Outstanding						Options Exercisable
Range of Exercises Prices		Shares		Weighted- Average Remaining Contractual Term		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
		(in thousands)		(in years)				(in thousands)
$	0.76 - $14.96		118		2.0	$	12.16		98	$	12.07
$	15.03 - $15.03		321		0.8	$	15.03		321	$	15.03
$	15.13 - $23.50		151		1.6	$	20.29		149	$	20.36
			590		1.2	$	15.80		568	$	15.92

Total intrinsic value of options exercised was $17.3 million, $27.8 million and $10.0 million for the years ended December 31, 2014, 2013 and 2012, respectively. The net cash proceeds from the exercise of stock options were $11.9 million, $37.9 million and $13.4 million for the years ended December 31, 2014, 2013 and 2012, respectively. At December 31, 2014, unamortized compensation expense related to unvested options was approximately $0.1 million with a weighted-average remaining recognition period of less than one year.

The grant date fair value of stock options was determined using the Black-Scholes model with the following assumptions (excluding the options modification discussed above): 

	Year Ended
	December 31, 2012
Expected term (years)		4.1
Expected volatility		53.4	%
Risk-free interest rate		0.6	%
Dividend yield		-

 Employee Stock Purchase Plan

Under the 2004 Employee Stock Purchase Plan (the “ESPP”), eligible employees may purchase common stock through payroll deductions. Participants may not purchase more than 2,000 shares in a six-month offering period or stock having a value greater than $25,000 in any calendar year as measured at the beginning of the offering period in accordance with the Internal Revenue Code and applicable Treasury Regulations.  The ESPP provides for an annual increase by an amount equal to the least of 1.0 million shares, 2% of the outstanding shares of common stock on the first day of the year, or a number of shares as determined by the Board of Directors. For the years ended December 31, 2014, 2013 and 2012, 78,000, 111,000 and 152,000 shares, respectively, were issued under the ESPP. As of December 31, 2014, approximately 4.7 million shares were available for future issuance.

The intrinsic value for stock purchased was $0.9 million, $0.8 million and $1.0 million for the years ended December 31, 2014, 2013 and 2012, respectively. The unamortized expense as of December 31, 2014 was $0.1 million, which will be recognized by the first quarter of 2015. The Black-Scholes model was used to value the employee stock purchase rights with the following weighted-average assumptions:

	Year Ended December 31,
	2014			2013			2012
Expected term (years)		0.5			0.5			0.5
Expected volatility		29.4	%		28.0	%		45.8	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%
Dividend yield		0.7	%		-			-

Cash proceeds from the ESPP were $2.1 million, $2.1 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.

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Note 5 - Balance Sheet Components (Details) - Property and Equipment, Net (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment	$ 133,842	$ 123,824
Less: accumulated depreciation and amortization	(70,900)	(58,987)
Total	62,942	64,837
Production Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	88,929	83,075
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	29,386	29,342
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	5,600	5,600
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	4,694	976
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	2,883	2,681
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,350	$ 2,150

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Note 5 - Balance Sheet Components

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Supplemental Balance Sheet Disclosures [Text Block]

5. BALANCE SHEET COMPONENTS

Inventories 

Inventories consist of the following (in thousands):

	As of December 31,
	2014		2013
Raw materials	$	7,298	$	12,453
Work in process		18,950		14,152
Finished goods		14,670		13,132
Total	$	40,918	$	39,737

Property and Equipment, Net

Property and equipment, net, consist of the following (in thousands):

	As of December 31,
	2014			2013
Production equipment and software	$	88,929		$	83,075
Buildings and improvements		29,386			29,342
Land		5,600			5,600
Transportation equipment		4,694			976
Furniture and fixtures		2,883			2,681
Leasehold improvements		2,350			2,150
Property and equipment, gross		133,842			123,824
Less: accumulated depreciation and amortization		(70,900	)		(58,987	)
Total	$	62,942		$	64,837

Depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012 was $12.4 million, $12.1 million and $9.3 million, respectively.

Other Long-Term Assets

Other long-term assets consist of the following (in thousands):

	As of December 31,
	2014		2013
Deferred compensation plan assets	$	6,084	$	607
Prepaid expense		1,418		57
Other		955		980
Total	$	8,457	$	1,644

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	As of December 31,
	2014		2013
Deferred proceeds from litigation	$	-	$	9,489
Dividends and dividend equivalents		6,080		-
Deferred revenue and customer prepayments		3,908		2,523
Stock rotation reserve		1,757		1,459
Commissions		767		931
Sales rebate		586		900
Warranty		240		451
Other		1,365		1,623
Total	$	14,703	$	17,376

Other Long-Term Liabilities

Other long-term liabilities consist of the following (in thousands):

	As of December 31,
	2014		2013
Deferred compensation plan liabilities	$	6,177	$	628
Contingent consideration		2,507		-
Dividend equivalents		580		-
Other		940		850
Total	$	10,204	$	1,478

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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

6. GOODWILL AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET

There have been no changes in the balance of goodwill from the Acquisition Date to December 31, 2014. The Company did not identify any goodwill impairment in 2014.

Acquisition-related intangible assets consist of the following (in thousands):

	As of December 31, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Subject to amortization:
Know-how	$	1,018	$	(93	)	$	925
Developed technologies		4,421		(579	)		3,842
Not subject to amortization:
IPR&D		2,045		-			2,045
Total	$	7,484	$	(672	)	$	6,812

Amortization expense was recorded in cost of revenue in the Consolidated Statements of Operations and totaled $0.7 million for the year ended December 31, 2014.

The estimated future amortization expense as of December 31, 2014 is as follows (in thousands):

2015	$	1,467
2016		1,467
2017		1,467
2018 and thereafter		366
Total	$	4,767

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Note 8 - Stock Repurchase Program

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block]

 8. STOCK REPURCHASE PROGRAM

In July 2013, the Board of Directors approved a stock repurchase program that authorizes the Company to repurchase up to $100 million in the aggregate of its common stock through June 30, 2015. All shares are retired upon repurchase. The following table summarizes the repurchase activities under the program (in thousands, except per share amounts):

	Shares Repurchased		Average Price Per Share		Total Amount
Cumulative balance at January 1, 2014		664	$	31.06	$	20,615
Repurchases		1,051	$	39.19		41,198
Cumulative balance at December 31, 2014		1,715	$	36.04	$	61,813

As of December 31, 2014, $38.2 million remained available for future repurchases under the program.

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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) (Cost Of Revenue [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Cost Of Revenue [Member]
Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) [Line Items]
Amortization of Intangible Assets	$ 0.7

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Note 12 - Commitments and Contingencies (Details) (USD $)	1 Months Ended	12 Months Ended
	Sep. 30, 2004	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 12 - Commitments and Contingencies (Details) [Line Items]
Lease Purchase Option	$ 1,600,000
Operating Leases, Rent Expense		1,500,000	1,200,000	1,600,000
Indemnification Agreement [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Other Liabilities		$ 0	$ 0	$ 0
Minimum [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Warranty Term		1 year
Maximum [Member]
Note 12 - Commitments and Contingencies (Details) [Line Items]
Warranty Term		2 years

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Note 6 - Goodwill and Acuisition-Related Intangible Assets, Net (Details) - Future Amortization Expense (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Future Amortization Expense [Abstract]
2015	$ 1,467
2016	1,467
2017	1,467
2018 and thereafter	366
Total	$ 4,767

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Note 5 - Balance Sheet Components (Details) - Long-Term Liabilities (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Long-Term Liabilities [Abstract]
Deferred compensation plan liabilities	$ 6,177	$ 628
Contingent consideration	2,507
Dividend equivalents	580
Other	940	850
Total	$ 10,204	$ 1,478

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Note 16 - Segment and Geographic Information (Details) - Revenue By Region (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 282,535,000	$ 238,091,000	$ 213,813,000
CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	181,050,000	141,400,000	124,278,000
TAIWAN, PROVINCE OF CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	38,460,000	34,248,000	27,477,000
Europe [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	19,830,000	15,351,000	16,201,000
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	14,362,000	9,992,000	9,434,000
South East Asia [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	13,993,000	21,760,000	21,641,000
JAPAN
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	8,251,000	7,495,000	8,516,000
UNITED STATES
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	6,392,000	7,525,000	5,711,000
Other Region [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 197,000	$ 320,000	$ 555,000

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Note 8 - Stock Repurchase Program (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Schedule of Repurchase Agreements [Table Text Block]

	Shares Repurchased		Average Price Per Share		Total Amount
Cumulative balance at January 1, 2014		664	$	31.06	$	20,615
Repurchases		1,051	$	39.19		41,198
Cumulative balance at December 31, 2014		1,715	$	36.04	$	61,813

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Note 3 - Cash, Cash Equivalents and Investments (Details) - Investment Maturity Classification (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment Maturity Classification [Abstract]
Due in less than 1 year	$ 91,335	$ 95,509
Due in 1 - 5 years	21,117	29,617
Due in greater than 5 years	5,389	9,860
Total	$ 117,841	$ 134,986

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Note 13 - Litigation

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

Legal Matters and Contingencies [Text Block]

13.  LITIGATION

The Company and certain of its subsidiaries are parties to actions and proceedings in the ordinary course of business, including litigation regarding its shareholders and its intellectual property, challenges to the enforceability or validity of its intellectual property and claims that the Company’s products infringe on the intellectual property rights of others. These proceedings often involve complex questions of fact and law and may require the expenditure of significant funds and the diversion of other resources to prosecute and defend. The Company defends itself vigorously against any such claims.

O2 Micro

In May 2012, the United States District Court for the Northern District of California (the “District Court”) issued an order finding O2 Micro International, Ltd. (“O2 Micro”) liable for approximately $9.1 million in attorneys’ fees and non-taxable costs, plus interest, in connection with the patent litigation that the Company won in 2010.  This award was in addition to the approximately $0.3 million in taxable costs that the District Court had earlier ordered O2 Micro to pay to the Company in connection with the same lawsuit.  In October 2012, O2 Micro appealed the District Court’s judgment to the United States Court of Appeals for the Federal Circuit (the “Federal Circuit”). In August 2013, the Federal Circuit affirmed O2 Micro’s liability for the full amount of the award.  In September 2013, O2 Micro filed a petition for rehearing of that ruling, but the Federal Circuit denied O2 Micro’s petition for rehearing in October 2013. 

In November 2013, the Company received a cash payment of $9.5 million from O2 Micro. In January 2014, O2 Micro filed an appeal with the United States Supreme Court. Had O2 Micro been successful in obtaining a favorable ruling against the Company, the Company could have been liable to return a portion or all of the $9.5 million to O2 Micro. Accordingly, the Company recorded the $9.5 million as a current liability as of December 31, 2013.

In March 2014, the Supreme Court declined to hear the case. As O2 Micro had no further legal avenues to appeal, the Company released the current liability of $9.5 million and recorded the award as a credit to litigation benefit, net, in the Consolidated Statements of Operations in the first quarter of 2014. In addition, the Company incurred additional legal fees of $0.5 million in connection with the final resolution of the lawsuit.

 Silergy

In December 2011, the Company entered into a settlement and license agreement with Silergy Corp. and Silergy Technology for infringement of the Company’s patent whereby the Company would receive a total of $2.0 million.  The first $1.2 million was paid in equal installments of $300,000 in each quarter of 2012 and the remainder was paid in two equal installments in the first two quarters of 2013. No further amount was due to the Company as of December 31, 2013. All amounts were recorded as credits to litigation benefit, net, in the Consolidated Statements of Operations in the periods the proceeds were received.

Linear

In August 2012, the United States Court of Appeals for the Federal Circuit issued an order affirming the judgment issued by the United States District Court for the District of Delaware finding Linear Technology Corporation (“Linear”) liable for approximately $2.3 million in attorneys’ fees and non-taxable costs, plus interest, in connection with the litigation regarding a contract dispute that the Company won in 2011. During the fourth quarter of 2012, the Company received a payment from Linear of $2.3 million plus $0.2 million reimbursement of additional attorney fees in connection with the cost of defending the appeal, which was recorded as a credit to litigation benefit, net, in the Consolidated Statements of Operations. 

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Note 18 - Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

18. QUARTERLY FINANCIAL DATA (UNAUDITED)

	Three Months Ended
	March 31, 2014			June 30, 2014		September 30, 2014			December 31, 2014
	(in thousands, except per share amounts)
Revenue	$	60,061		$	68,436	$	78,335		$	75,703
Cost of revenue		27,964			31,337		35,872			34,744
Gross profit		32,097			37,099		42,463			40,959
Operating expenses:
Research and development		15,603			13,368		14,679			14,941
Selling, general and administrative		16,109			16,853		17,006			16,787
Litigation expense (benefit), net		(8,700	)		274		332			66
Total operating expenses		23,012			30,495		32,017			31,794
Income from operations		9,085			6,604		10,446			9,165
Interest and other income, net		190			295		202			407
Income before income taxes		9,275			6,899		10,648			9,572
Income tax provision (benefit)		257			502		(573	)		712
Net income	$	9,018		$	6,397	$	11,221		$	8,860
Net income per share:
Basic	$	0.23		$	0.17	$	0.29		$	0.23
Diluted	$	0.23		$	0.16	$	0.28		$	0.22
Weighted-average shares outstanding:
Basic		38,470			38,684		38,785			38,807
Diluted		39,517			39,608		39,727			40,321
Cash dividends declared per common share	$	-		$	0.15	$	0.15		$	0.15

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenue	$	51,470		$	57,714		$	65,347		$	63,560
Cost of revenue		24,085			26,786			30,053			29,266
Gross profit		27,385			30,928			35,294			34,294
Operating expenses:
Research and development		12,123			12,478			12,643			12,487
Selling, general and administrative		13,258			13,793			13,891			13,683
Litigation expense (benefit), net		(301	)		(257	)		104			84
Total operating expenses		25,080			26,014			26,638			26,254
Income from operations		2,305			4,914			8,656			8,040
Interest and other income (expense), net		(10	)		218			(59	)		(57	)
Income before income taxes		2,295			5,132			8,597			7,983
Income tax provision (benefit)		(204	)		(357	)		1,187			484
Net income	$	2,499		$	5,489		$	7,410		$	7,499
Net income per share:
Basic	$	0.07		$	0.15		$	0.20		$	0.20
Diluted	$	0.07		$	0.14		$	0.19		$	0.19
Weighted-average shares outstanding:
Basic		36,259			37,053			37,910			38,328
Diluted		37,708			38,239			39,009			39,524
Cash dividends declared per common share	$	-		$	-		$	-		$	-

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Note 17 - Accumulated Other Comprehensive Income (Details) - Accumulated Balances of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2013	$ 6,260	$ 4,175
Balance	5,811	6,260	4,175
Other comprehensive income (loss) before reclassifications	(447)	2,089
Amounts reclassified from accumulated other comprehensive income	(2)	(4)
Net current period other comprehensive income (loss)	(449)	2,085	582
Available-for-sale Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2013	4	37
Balance	(15)	4
Other comprehensive income (loss) before reclassifications	(17)	(29)
Amounts reclassified from accumulated other comprehensive income	(2)	(4)
Net current period other comprehensive income (loss)	(19)	(33)
Auction Rate Securities [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2013	(360)	(490)
Balance	(181)	(360)
Other comprehensive income (loss) before reclassifications	179	130
Net current period other comprehensive income (loss)	179	130
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of January 1, 2013	6,616	4,628
Balance	6,007	6,616
Other comprehensive income (loss) before reclassifications	(609)	1,988
Net current period other comprehensive income (loss)	$ (609)	$ 1,988

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Note 3 - Cash, Cash Equivalents and Investments (Details) - Current Assets Fair Market Value (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash, cash equivalents and investments:
Cash	$ 66,188	$ 62,625
Money market funds	60,078	35,588
Certificates of deposit	22,778
U.S. treasuries and government agency bonds	89,674	128,126
Total	244,107	236,199
Auction Rate Securities [Member]
Cash, cash equivalents and investments:
Auction-rate securities backed by student-loan notes	$ 5,389	$ 9,860

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Note 17 - Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Unrealized Losses on Auction-Rate Securities			Unrealized Gains (Losses) on Other Available-for-Sale Securities			Foreign Currency Translation Adjustments			Total
Balance as of January 1, 2013	$	(490	)	$	37		$	4,628		$	4,175
Other comprehensive income (loss) before reclassifications		130			(29	)		1,988			2,089
Amounts reclassified from accumulated other comprehensive income		-			(4	)		-			(4	)
Net current period other comprehensive income (loss)		130			(33	)		1,988			2,085
Balance as of December 31, 2013		(360	)		4			6,616			6,260
Other comprehensive income (loss) before reclassifications		179			(17	)		(609	)		(447	)
Amounts reclassified from accumulated other comprehensive income		-			(2	)		-			(2	)
Net current period other comprehensive income (loss)		179			(19	)		(609	)		(449	)
Balance as of December 31, 2014	$	(181	)	$	(15	)	$	6,007		$	5,811

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 35,495	$ 22,898	$ 15,756
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(609)	1,988	408
Total other comprehensive income (loss), net of tax	(449)	2,085	582
Comprehensive income	35,046	24,983	16,338
Auction Rate Securities [Member]
Other comprehensive income (loss), net of tax:
Change in unrealized losses on securities, net of tax	179	130	140
Available-for-sale Securities [Member]
Other comprehensive income (loss), net of tax:
Change in unrealized losses on securities, net of tax	$ (19)	$ (33)	$ 34

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Note 13 - Litigation (Details) (USD $)	3 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Jan. 31, 2014	Nov. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	May 03, 2012	Dec. 31, 2011	Aug. 31, 2012
Attorney Fees [Member] | O2 Micro [Member]
Note 13 - Litigation (Details) [Line Items]
Gain Contingency, Unrecorded Amount										$ 9,100,000
Attorney Fees [Member] | Linear Technology Corporation [Member]
Note 13 - Litigation (Details) [Line Items]
Proceeds from Legal Settlements	200,000
Taxable Costs [Member] | O2 Micro [Member]
Note 13 - Litigation (Details) [Line Items]
Gain Contingency, Unrecorded Amount										300,000
O2 Micro [Member]
Note 13 - Litigation (Details) [Line Items]
Proceeds from Legal Settlements		9,500,000	9,500,000	9,500,000	9,500,000
Litigation Settlement, Expense				500,000
Silergy [Member]
Note 13 - Litigation (Details) [Line Items]
Proceeds from Legal Settlements	300,000					300,000	300,000	300,000	1,200,000
Legal Settlements, Receivables											2,000,000
Outstanding Legal Settlement					0
Linear Technology Corporation [Member]
Note 13 - Litigation (Details) [Line Items]
Gain Contingency, Unrecorded Amount												2,300,000
Proceeds from Legal Settlements	$ 2,300,000

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Note 2 - Acquisition

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

2. ACQUISITION

On July 22, 2014 (the “Acquisition Date”), the Company acquired 100% of the outstanding capital stock of Sensima Technology SA (“Sensima”), a company based in Switzerland that develops magnetic sensor technologies for angle measurements as well as three-dimensional magnetic field sensing. The acquisition is expected to create new opportunities with customers by offering enhanced solutions in power management for key industries such as automotive, industrial and cloud computing. Subsequent to the Acquisition Date, Sensima became a subsidiary of the Company and its results of operations have been included in the Company’s consolidated financial statements.

Purchase Consideration

The fair value of the purchase consideration consists of the following (in thousands):

Cash paid at the Acquisition Date	$	11,735
Contingent consideration		2,507
Total	$	14,242

Cash paid at the Acquisition Date included $1.2 million that is being held in an escrow account for a one-year period, which is subject to Sensima’s satisfaction of certain representations and warranties.

The contingent consideration arrangement requires the Company to pay up to an additional $8.9 million to former Sensima shareholders if Sensima achieves a new product introduction as well as certain product revenue and direct margin targets in 2016. The fair value of the contingent consideration at the Acquisition Date was $2.5 million, which was estimated based on a probability-weighted analysis of possible future cash flow outcomes. The fair value of the contingent consideration is recorded in other long-term liabilities in the Consolidated Balance Sheets and is remeasured at the end of each reporting period, with any changes in fair value recorded in operating expense in the Consolidated Statements of Operations. Actual amounts that will ultimately be paid may differ from the obligations recorded.

The Company incurred $0.6 million of transaction costs that were expensed as incurred and included in selling, general and administrative expenses in the Consolidated Statements of Operations.

Preliminary Purchase Consideration Allocation

The estimated fair value of assets acquired and liabilities assumed is as follows (in thousands):

Cash	$	145
Other tangible assets acquired, net of liabilities assumed		42
Intangible assets:
Know-how		1,018
Developed technologies		4,421
IPR&D		2,045
Total identifiable net assets acquired		7,671
Goodwill		6,571
Total net assets acquired	$	14,242

Intangible assets with finite lives include know-how and developed technologies with estimated useful lives of three to five years. The fair value of know-how was determined using the relief from royalty method, and the fair value of the developed technologies was determined using the income approach. Intangible assets with indefinite lives include IPR&D, which consists of incomplete R&D projects that had not reached technological feasibility as of the Acquisition Date. The fair value of the IPR&D assets was determined using the income approach.

The goodwill arising from the acquisition was primarily attributed to synergies which will enable the Company to develop advanced solutions in power management by combining with Sensima’s magnetic sensor technologies. The goodwill is not expected to be deductible for tax purposes.

The purchase price allocation is considered preliminary and dependent upon the finalization of the valuation of assets acquired and liabilities assumed, primarily related to deferred taxes. The Company is currently determining if the acquisition qualifies as a tax-free reorganization within the meaning of Swiss tax rules pursuant to the tax holiday granted to Sensima by the Swiss tax authorities. Final determination of the valuation could result in an adjustment to the preliminary purchase price allocation, with an offsetting adjustment to goodwill.

Equity Awards

On the Acquisition Date, the Board of Directors granted $1.7 million of time-based RSUs (or 40,000 shares) to key Sensima employees who became employees of the Company. These awards vest over four years. In addition, the Board of Directors granted $2.0 million of PSUs (or 47,000 shares) to these employees, with the right to earn up to a maximum of $8.0 million based on the achievement of certain cumulative Sensima product revenue targets during the performance period from the Acquisition Date to July 22, 2019. One half of the awards subject to each revenue goal will vest immediately when the pre-determined revenue goal is met and approved by the Compensation Committee, and the remaining 50% will vest over the following two years. The vesting is subject to the employees’ continued employment with the Company. These equity awards are considered arrangements for post-acquisition services and the related compensation expense is being recognized over the requisite service period.

Pro Forma Information (Unaudited)

Supplemental information of the Company’s results of operations on a pro forma basis, as if the Sensima acquisition had been consummated on January 1, 2013, is presented as follows (in thousands, except per-share amounts):

	Year Ended December 31,
	2014		2013
Revenue	$	282,584	$	238,181
Net income	$	33,777	$	20,187
Diluted net income per share	$	0.85	$	0.52

These pro forma results are not necessarily indicative of the Company’s consolidated results of operations in future periods or the results that would have been realized had the Company acquired Sensima during the periods presented. The pro forma results include adjustments primarily related to Sensima’s results of operations, amortization of intangible assets, stock-based compensation expense and the related tax effects.

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Note 5 - Balance Sheet Components (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Text Block Supplement [Abstract]
Depreciation	$ 12.4	$ 12.1	$ 9.3

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Note 11 - Income Taxes (Details) - Income Tax Rate Reconciliation	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Rate Reconciliation [Abstract]
U.S. statutory federal tax rate	34.00%	34.00%	34.00%
State, net of federal benefit		0.30%
Research and development credits	(0.30%)		(3.60%)
Stock-based compensation	(9.30%)	(13.70%)	0.10%
Foreign income at lower rates	(27.70%)	(33.80%)	(28.40%)
Changes in valuation allowance	6.20%	16.80%	7.00%
Litigation reserves and other	(0.40%)	1.00%	2.80%
Effective tax rate	2.50%	4.60%	11.90%

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Note 7 - Stock-Based Compensation (Details) - RSU Summary (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	3,582,000		1,630,000		1,299,000
Outstanding at January 1, 2012	$ 22,530		$ 17,460		$ 16,870
Modification (1)						[1]
Modification (1)						[1]
Shares	1,426,000	[2],[3]	2,974,000	[2]	1,580,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 34,820	[2],[3]	$ 23,890	[2]	$ 18,420	[2],[4]
Shares	(139,000)	[5]	(124,000)	[5]	(624,000)	[5]
Weighted-Average Grant Date Fair Value Per Share	$ 31,400	[5]	$ 21,980	[5]	$ 18,190	[5]
Shares	(772,000)		(725,000)		(544,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,480		$ 17,950		$ 17,910
Shares	(49,000)		(173,000)		(81,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,770		$ 17,610		$ 16,740
Shares	4,048,000		3,582,000		1,630,000
Weighted-Average Grant Date Fair Value Per Share	$ 26,140		$ 22,530		$ 17,460
Time-Based RSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	754,000		1,099,000		1,082,000
Outstanding at January 1, 2012	$ 19,410		$ 16,960		$ 16,000
Modification (1)					(76,000)	[1]
Modification (1)					$ 15,690	[1]
Shares	335,000	[2],[3]	299,000	[2]	617,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 36,710	[2],[3]	$ 24,250	[2]	$ 18,690	[2],[4]
Shares		[5]		[5]		[5]
Weighted-Average Grant Date Fair Value Per Share		[5]		[5]		[5]
Shares	(468,000)		(519,000)		(447,000)
Weighted-Average Grant Date Fair Value Per Share	$ 20,360		$ 17,570		$ 17,300
Shares	(32,000)		(125,000)		(77,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,750		$ 17,060		$ 16,610
Shares	589,000		754,000		1,099,000
Weighted-Average Grant Date Fair Value Per Share	$ 28,480		$ 19,410		$ 16,960
PSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	1,028,000		531,000		217,000
Outstanding at January 1, 2012	$ 23,020		$ 18,490		$ 20,730
Modification (1)					76,000	[1]
Modification (1)					$ 15,690	[1]
Shares	1,091,000	[2],[3]	875,000	[2]	963,000	[2],[4]
Weighted-Average Grant Date Fair Value Per Share	$ 34,230	[2],[3]	$ 24,430	[2]	$ 18,240	[2],[4]
Shares	(139,000)	[5]	(124,000)	[5]	(624,000)	[5]
Weighted-Average Grant Date Fair Value Per Share	$ 31,400	[5]	$ 21,980	[5]	$ 18,190	[5]
Shares	(304,000)		(206,000)		(97,000)
Weighted-Average Grant Date Fair Value Per Share	$ 18,120		$ 18,900		$ 20,730
Shares	(17,000)		(48,000)		(4,000)
Weighted-Average Grant Date Fair Value Per Share	$ 19,790		$ 19,060		$ 19,070
Shares	1,659,000		1,028,000		531,000
Weighted-Average Grant Date Fair Value Per Share	$ 28,110		$ 23,020		$ 18,490
MSUs [Member]
Note 7 - Stock-Based Compensation (Details) - RSU Summary [Line Items]
Outstanding at January 1, 2012	1,800,000
Outstanding at January 1, 2012	$ 23,570
Modification (1)						[1]
Modification (1)						[1]
Shares		[2],[3]	1,800,000	[2]		[2],[4]
Weighted-Average Grant Date Fair Value Per Share		[2],[3]	$ 23,570	[2]		[2],[4]
Shares		[5]		[5]		[5]
Weighted-Average Grant Date Fair Value Per Share		[5]		[5]		[5]
Shares	1,800,000		1,800,000
Weighted-Average Grant Date Fair Value Per Share	$ 23,570		$ 23,570

[1] See "2011 and 2012 CEO Awards" below for further discussion.

[2] Amount reflects the maximum number of PSUs that can be earned assuming the achievement of the highest level of performance conditions.

[3] Amount does not include 674,000 shares of time-based RSUs and PSUs authorized by the Board of Directors in October 2014, as the grant date of these awards has not been established at the time of approval. See "2014 Time-Based RSUs and PSUs" below for further discussion.

[4] Amount includes 74,000 shares granted as a result of the equity award modification. See "Equity Award Modifications" above for further discussion.

[5] Amount reflects the number of PSUs that have not been earned or may not be earned based on management's probability assessment.

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Accounting Policies, by Policy (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Basis of Presentation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenue and expenses during the reporting period. Significant estimates and assumptions used in these consolidated financial statements primarily include those related to revenue recognition, inventory valuation, valuation of stock-based awards, valuation of goodwill and acquisition-related intangible assets, contingencies and tax valuation allowances. Actual results could differ from those estimates.

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Certain Significant Risks and Uncertainties

Financial instruments which potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short-term and long-term investments and accounts receivable. The Company’s cash consists of checking and savings accounts. The Company’s cash equivalents include short-term, highly liquid investments purchased with remaining maturities at the date of purchase of three months or less. The Company’s short-term investments consist primarily of certificates of deposit and government agencies and treasuries and the long-term investments consist of government-backed student loan auction-rate securities. The Company generally does not require its customers to provide collateral or other security to support accounts receivable. To manage credit risk, management performs ongoing credit evaluations of its customers’ financial condition.  The Company requires cash in advance for certain customers in addition to ongoing credit evaluations for those where credit has been extended. Accounts receivable allowances were not material in any periods presented.

The Company participates in the dynamic high technology industry and believes that changes in any of the following areas could have a material adverse effect on its future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reductions on current products; changes in product mix; changes in the overall demand for products offered by the Company; changes in third-party manufacturers; changes in key suppliers; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; fluctuations in foreign currency exchange rates; risk associated with changes in domestic and international economic and/or political regulations; availability of necessary components or subassemblies; availability of foundry capacity; ability to integrate acquired companies; and the Company’s ability to attract and retain employees necessary to support its growth.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency  

The functional currency of the Company’s international subsidiaries is primarily the local currency. The majority of the subsidiaries is located in China and Taiwan, which utilize the Renminbi and the New Taiwan Dollar as their currencies, respectively. Accordingly, assets and liabilities of the foreign subsidiaries are translated using exchange rates in effect at the end of the period. Revenue and costs are translated using average exchange rates for the period. The resulting translation adjustments are presented as a separate component of accumulated other comprehensive income in stockholders’ equity in the Consolidated Balance Sheets. In addition, the Company incurs foreign currency exchange gains or losses related to the timing of payments for transactions between the U.S. and its subsidiaries. Foreign currency transaction gains (losses) are reported in interest and other income, net, in the Consolidated Statements of Operations and totaled $0.1 million, $(0.6) million and $(0.1) million for the years ended December 31, 2014, 2013 and 2012, respectively.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents 

The Company classifies all highly liquid investments with stated maturities of three months or less from date of purchase as cash equivalents.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1: Quoted prices in active markets for identical assets

Level 2: Significant other observable inputs

Level 3: Significant unobservable inputs

The Company’s financial instruments include cash and cash equivalents, short-term and long-term investments. Cash equivalents are stated at cost, which approximates fair market value. The Company’s short-term and long-term investments are classified as available-for-sale securities and are stated at their fair market value.

The Company determines whether an impairment is temporary or other-than temporary. Unrealized gains or losses that are deemed to be temporary are recorded as a component of accumulated other comprehensive income in stockholder’s equity in the Consolidated Balance Sheets, and changes in unrealized gains or losses are recorded in the Consolidated Statements of Comprehensive Income. The Company records an impairment charge in interest and other income, net, in the Consolidated Statements of Operations when an available-for-sale investment has experienced a decline in value that is deemed to be other-than-temporary. Other-than-temporary impairment exists when the Company either has the intent to sell the security, it will more likely than not be required to sell the security before anticipated recovery, or it does not expect to recover the entire amortized cost basis of the security.

At December 31, 2014, the fair value of the Company’s holdings in auction-rate securities was $5.4 million, all of which was classified as long-term available-for-sale investments. The valuation of the auction-rate securities is subject to fluctuations in the future, which will depend on many factors, including the quality of the underlying collateral, estimated time to liquidity including potential to be called or restructured, underlying final maturity, insurance guaranty and market conditions, among others.

Inventory, Policy [Policy Text Block]

Inventories

Inventories are stated at the lower of standard cost (which approximates actual cost determined on a first-in first-out basis) or current market value. The Company writes down excess and obsolete inventory based on its age and forecasted demand, which includes estimates taking into consideration the Company’s outlook on market and economic conditions, technology changes, new product introductions and changes in strategic direction. Actual demand may differ from forecasted demand and such differences may have a material effect on recorded inventory values. Inventory write-downs are not reversed until the related inventories have been sold.

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment

Property and equipment are stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Buildings and building improvements have a depreciation life of 30 to 40 years. Leasehold improvements are amortized over the shorter of the estimated useful life or the lease period.  Computer, software and equipment have a depreciation life of three to seven years. Transportation equipment has a depreciate life of 5 to 15 years. Furniture and fixtures have a depreciation life of three to five years.

Goodwill and Intangible Assets, Policy [Policy Text Block]

Goodwill and Acquisition-Related Intangible Assets

Goodwill represents the excess of the fair value of purchase consideration over the fair value of net tangible and identified intangible assets as of the date of acquisition. In-process research and development (“IPR&D”) assets represent the fair value of incomplete R&D projects that had not reached technological feasibility as of the date of acquisition. The IPR&D assets are initially capitalized at fair value as intangible assets with indefinite lives. When the IPR&D projects are completed, they are reclassified as amortizable intangible assets and are amortized over their estimated useful lives. Alternatively, if the IPR&D projects are abandoned, they are impaired and expensed to research and development.

Acquisition-related intangible assets with finite lives consist of know-how and developed technologies. These assets are amortized on a straight-line basis over estimated useful lives ranging from three to five years and the amortization expense is recorded in cost of revenue in the Consolidated Statements of Operations.

Other Assets Policy [Policy Text Block]

Other Long-Term Assets

Other assets primarily consist of intangible assets for the land use rights in Chengdu, China, purchased patents, long-term lease deposits and deferred compensation plan investments. We amortize the land use rights over 50 years and the purchased patents over five years.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Impairment of Long-Lived Assets

The Company evaluates long-lived assets, other than goodwill and acquisition-related intangible assets with indefinite useful lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss would be recognized when the sum of the undiscounted future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. Such impairment loss would be measured as the difference between the carrying amount of the asset and its fair value based on the present value of estimated future cash flows.

The Company tests goodwill for impairment at least annually, or whenever events or changes in circumstances indicate that the goodwill may be impaired. The Company has elected to first assess the qualitative factors to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company determines that it is more likely than not that its fair value is less than the carrying amount, then the two-step goodwill impairment test is performed. The first step compares the fair value of the reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step measures the impairment loss by comparing the implied fair value of the goodwill with the carrying amount. As of December 31, 2014, no impairment of goodwill has been identified.

Deferred Compensation Plan Policy [Policy Text Block]

Deferred Compensation Plan 

The Company has a non-qualified, unfunded deferred compensation plan, which provides certain key employees, including executive management, with the ability to defer the receipt of compensation in order to accumulate funds for retirement on a tax deferred basis. The Company does not make contributions to the plan or guarantee returns on the investments. The Company is responsible for the plan’s administrative expenses. Participants’ deferrals and investment gains and losses remain as the Company’s liabilities and the underlying assets are subject to claims of general creditors.

The liabilities for compensation deferred under the plan are recorded at fair value in each reporting period and are included in other long-term liabilities in the Consolidated Balance Sheets. Changes in the fair value of the liabilities are recorded as an operating expense (credit) in the Consolidated Statements of Operations. The Company manages the risk of changes in the fair value of the liabilities by electing to match the liabilities with investments that offset a substantial portion of the exposure. The investments are recorded in other long-term assets in the Consolidated Balance Sheets at the cash surrender value of the corporate-owned life insurance policies and at the fair value of the mutual fund investments, which are classified as trading securities. Changes in the cash surrender value of the corporate-owned life insurance policies and the fair value of mutual fund investments are included in interest and other income, net in the Consolidated Statements of Operations. As of December 31, 2014 and 2013, the plan assets totaled $6.1 million and $0.6 million, and the plan liabilities totaled $6.2 million and $0.6 million, respectively.

Standard Product Warranty, Policy [Policy Text Block]

Warranty Reserves

The Company generally provides a one to two-year warranty against defects in materials and workmanship and will either repair the goods or provide replacement products at no charge to the customer for defective products. Reserve requirements are recorded in the period of sale and are based on an assessment of the products sold with warranty and historical warranty costs incurred. Historically, the warranty expenses have not been material to the Company’s consolidated financial statements.

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition

The Company recognizes revenue when the following four basic criteria are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the fee is fixed or determinable; and (4) collectability is reasonably assured. Determination of criteria (3) and (4) are based on management’s judgment regarding the fixed nature of the fees charged for products delivered and the collectability of those fees. The application of these criteria has resulted in the Company generally recognizing revenue upon shipment (when title passes) to customers, including distributors, original equipment manufacturers and electronic manufacturing service providers.

The Company’s revenue consists primarily of sales of assembled and tested finished goods. The Company also sells die in wafer form to its customers and value-added resellers, and the Company receives royalty revenue from third parties and value-added resellers.

For the years ended December 31, 2014 and 2013, approximately 92% and 91% of the Company’s distributor sales, respectively, including sales to the Company’s value-added resellers, were made through distribution arrangements with third parties. These arrangements do not include any special payment terms (the Company’s normal payment terms are 30-45 days for its distributors), price protection or exchange rights. Returns are limited to the Company’s standard product warranty. Certain of the Company’s large distributors have contracts that include limited stock rotation rights that permit the return of a small percentage of the previous six months’ purchases.

For the years ended December 31, 2014 and 2013, approximately 8% and 9% of the Company’s distributor sales, respectively, were made through small distributors primarily based on purchase orders. These distributors typically have no stock rotation rights.

The Company generally recognizes revenue upon shipment of products to the distributors for the following reasons:

(1)	The price is fixed or determinable at the date of sale. The Company does not offer special payment terms, price protection or price adjustments to distributors when the Company recognizes revenue upon shipment.
(2)	The distributors are obligated to pay the Company and this obligation is not contingent on the resale of the Company’s products.
(3)	The distributors’ obligation is unchanged in the event of theft or physical destruction or damage to the products.
(4)	The distributors have stand-alone economic substance apart from the Company’s relationship.
(5)	The Company does not have any obligations for future performance to directly bring about the resale of its products by the distributors.
(6)	The amount of future returns can be reasonably estimated. The Company has the ability and the information necessary to track inventory sold to and held at its distributors. The Company maintains a history of returns and has the ability to estimate the stock rotation returns on a quarterly basis.

The Company maintains a sales reserve for stock rotation rights, which is based on historical experience of actual stock rotation returns on a per distributor basis, where available, and information related to products in the distribution channel. This reserve is recorded at the time of sale. Historically, these returns were not material to the Company’s consolidated financial statements.  

If the Company enters into arrangements that have rights of return that are not estimable, the Company recognizes revenue under such arrangements only after the distributors have sold the products to end customers. Three of the Company’s U.S. distributors have distribution agreements where revenue is recognized upon sale by these distributors to their end customers because these distributors have certain rights of return which management believes are not estimable. The deferred revenue balance from these distributors as of December 31, 2014 and 2013 was $2.0 million and $1.7 million, respectively. The deferred costs as of December 31, 2014 and 2013 were $0.2 million.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Stock-Based Compensation

The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The Company uses the Black-Scholes model to estimate the fair value of its options and shares issued under employee stock purchase plan. The fair value of time-based and performance-based restricted stock units is based on the grant date share price. The fair value of market-based restricted stock units is estimated using a Monte Carlo simulation model.

The Company recognizes compensation expense equal to the grant-date fair value for all share-based payment awards that are expected to vest. This expense is recorded on a straight-line basis over the requisite service period of the entire awards, unless the awards are subject to performance or market conditions, in which case the Company recognizes compensation expense over the requisite service period of each separate vesting tranche. For the performance-based awards, the Company recognizes compensation expense when it becomes probable that the performance criteria set by the Board of Directors will be achieved. For the market-based awards, compensation expense is not reversed if the market condition is not satisfied. The amount of stock-based compensation that the Company recognizes is based on an expected forfeiture rate. If there is a difference between the forfeiture assumptions used in determining stock-based compensation costs and the actual forfeitures which become known over time, the Company may change the forfeiture rate, which could have a significant impact on its stock-based compensation expense.

Research and Development Expense, Policy [Policy Text Block]

Research and Development

Costs incurred in research and development are expensed as incurred.

Income Tax, Policy [Policy Text Block]

Accounting for Income Taxes 

The Company recognizes federal, state and foreign current tax liabilities or assets based on its estimate of taxes payable or refundable in the current fiscal year by tax jurisdiction. The Company also recognizes federal, state and foreign deferred tax assets or liabilities for its estimate of future tax effects attributable to temporary differences and carryforwards. The Company records a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized.

The Company’s calculation of current and deferred tax assets and liabilities is based on certain estimates and judgments and involves dealing with uncertainties in the application of complex tax laws. The Company’s estimates of current and deferred tax assets and liabilities may change based, in part, on added certainty or finality or uncertainty to an anticipated outcome, changes in accounting or tax laws in the U.S. or foreign jurisdictions where the Company operates, or changes in other facts or circumstances. In addition, the Company recognizes liabilities for potential U.S. and foreign income tax for uncertain income tax positions taken on its tax returns if it has less than a 50% likelihood of being sustained. If the Company determines that payment of these amounts is unnecessary or if the recorded tax liability is less than its current assessment, the Company may be required to recognize an income tax benefit or additional income tax expense in its financial statements in the period such determination is made. The Company has calculated its uncertain tax positions which were attributable to certain estimates and judgments primarily related to transfer pricing, cost sharing and its international tax structure exposure.

Commitments and Contingencies, Policy [Policy Text Block]

Contingencies

The Company is a party to actions and proceedings incident to its business in the ordinary course of business, including litigation regarding the Company’s intellectual property, challenges to the enforceability or validity of its intellectual property and claims that its products infringe on the intellectual property rights of others. The pending proceedings involve complex questions of fact and law and will require the expenditure of significant funds and the diversion of other resources to prosecute and defend. In addition, from time to time, the Company becomes aware that it is subject to other contingent liabilities. When this occurs, the Company will evaluate the appropriate accounting for the potential contingent liabilities to determine whether a contingent liability should be recorded. In making this determination, management may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts. Based on the facts and circumstances in each matter, the Company uses its judgment to determine whether it is probable that a contingent loss has occurred and whether the amount of such loss can be estimated. If the Company determines a loss is probable and estimable, the Company records a contingent loss. In determining the amount of a contingent loss, the Company takes into account advice received from experts for each specific matter regarding the status of legal proceedings, settlement negotiations, prior case history and other factors. Should the judgments and estimates made by management need to be adjusted as additional information becomes available, the Company may need to record additional contingent losses. Alternatively, if the judgments and estimates made by management are adjusted, for example, if a particular contingent loss does not occur, the contingent loss recorded would be reversed.

Legal Costs, Policy [Policy Text Block]

Litigation Expense (Benefit)

The Company records litigation costs in the period in which they are incurred. Due to the uncertainties inherent in litigation proceedings, the Company generally recognizes the proceeds resulting from settlement of litigation or favorable judgments when the cash is received and there is no further contingency related to the litigation. The proceeds are recorded as a reduction against litigation expense to the extent that litigation costs were previously incurred in the related case. Proceeds in excess of cumulative costs incurred for the case is recorded in interest and other income, net, in the Consolidated Statements of Operations. Litigation expense (benefit), net, includes primarily patent litigation and other contract-related matters.

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income

Comprehensive income represents the change in the Company’s net assets during the period from non-owner sources. Accumulated other comprehensive income presented in the Consolidated Balance Sheets primarily consists of unrealized gains and losses related to available-for-sale investments and foreign currency translation adjustments.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The standard gives guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists, with the purpose of reducing diversity in practice. This new standard requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. The Company adopted this standard in the first quarter of 2014 prospectively and the adoption did not have an impact on its consolidated financial position, results of operations or cash flows.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard’s core principle is that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Under the new standard, entities will apply the following five-step model when evaluating revenue contracts with customers:

(1) Identify the contract with a customer.

(2) Identify the performance obligations in the contract.

(3) Determine the transaction price.

(4) Allocate the transaction price to the performance obligations in the contract.

(5) Recognize revenue when the entity satisfies a performance obligation.

The new standard is effective for annual and interim reporting periods beginning after December 15, 2016. Entities have the option of using either a full retrospective or a modified retrospective application in the adoption of this standard. The Company will adopt the standard in the first quarter of 2017 and is evaluating the transition method and the impact of the adoption on its consolidated financial position, results of operations and cash flows.

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Note 8 - Stock Repurchase Program (Details) - Stock Repurchase Program (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 01, 2014	Dec. 31, 2014
Stock Repurchase Program [Abstract]
Cumulative balance at January 1, 2014	664	664
Cumulative balance at January 1, 2014	$ 31.06	$ 36.04
Cumulative balance at January 1, 2014	$ 20,615	$ 20,615
Repurchases		1,051
Repurchases		$ 39.19
Repurchases		41,198
Cumulative balance at December 31, 2014		1,715
Cumulative balance at December 31, 2014	$ 31.06	$ 36.04
Cumulative balance at December 31, 2014		$ 61,813

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Note 12 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

2015	$	1,094
2016		763
2017		297
2018 and thereafter		168
Total	$	2,322

Schedule of Product Warranty Liability [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
Balance at beginning of period	$	451		$	331		$	561
Warranty provision for product sales		282			476			917
Settlements made		(42	)		(117	)		(675	)
Unused warranty provision		(451	)		(239	)		(472	)
Balance at end of period	$	240		$	451		$	331

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Note 12 - Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

12.  COMMITMENTS AND CONTINGENCIES

Lease Obligations

As of December 31, 2014, future minimum payments under the non-cancelable operating leases were as follows (in thousands):

2015	$	1,094
2016		763
2017		297
2018 and thereafter		168
Total	$	2,322

In September 2004, the Company entered into a lease arrangement for its manufacturing facility located in Chengdu, China. The Company has the option to acquire the facility for approximately $1.6 million which consists of total construction costs minus total rent paid by the Company during the lease term. This option became exercisable in March 2011. The Company may exercise its purchase option and enter into a purchase agreement for this facility in the future.

The Company also leases sales and research and development offices in the United States, Japan, China, Europe, Taiwan and Korea. Certain of the Company’s facility leases provide for periodic rent increases. Rent expense for the years ended December 31, 2014, 2013 and 2012 was $1.5 million, $1.2 million and $1.6 million, respectively.

Warranty and Indemnification Provisions

The Company generally provides a standard one to two-year warranty against defects in materials and workmanship and will either repair the goods or provide replacements at no charge to the customer for defective units. In such cases, the Company accrues for the related costs at the time the decision to permit the return is made. Reserve requirements are recorded in the period of sale and are based on an assessment of the products sold with warranty and historical warranty costs incurred.

The changes in warranty reserves are as follows (in thousands):

	Year Ended December 31,
	2014			2013			2012
Balance at beginning of period	$	451		$	331		$	561
Warranty provision for product sales		282			476			917
Settlements made		(42	)		(117	)		(675	)
Unused warranty provision		(451	)		(239	)		(472	)
Balance at end of period	$	240		$	451		$	331

The Company provides indemnification agreements to certain direct or indirect customers. The Company agrees to reimburse these parties for any damages, costs and expenses incurred by them as a result of legal actions taken against them by third parties for infringing upon their intellectual property rights as a result of using the Company’s products and technologies. These indemnification provisions are varied in their scope and are subject to certain terms, conditions, limitations and exclusions. There were no indemnification liabilities incurred in 2014, 2013 and 2012. The Company also provides for indemnification of its directors and officers.