10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

☒Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2021

or

☐Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from ______  to  ______

Commission File Number 000-23441

POWER INTEGRATIONS, INC.

(Exact name of registrant as specified in its charter)

Delaware	94-3065014
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

5245 Hellyer Avenue
San Jose,	California	95138
(Address of Principal Executive Offices)		(Zip Code)

(408) 414-9200

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock	POWI	The Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 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 ☐

Indicate by check mark whether the registrant submitted electronically every Interactive Data File required to be submitted 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 such files).   Yes  ☒   No  ☐

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

Large Accelerated Filer	☒	Accelerated Filer	☐
Non-accelerated Filer	☐	Smaller Reporting Company	☐
		Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Shares Outstanding at April 26, 2021
Common Stock, $0.001 par value	60,655,187

POWER INTEGRATIONS, INC.

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020 (Unaudited)	4
	Condensed Consolidated Statements of Income for the three months ended March 31, 2021 and 2020 (Unaudited)	5
	Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020 (Unaudited)	6
	Condensed Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2021 and 2020 (Unaudited)	7
	Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020 (Unaudited)	8
	Notes to Unaudited Condensed Consolidated Financial Statements	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	28
Item 4.	Controls and Procedures	29
PART II. OTHER INFORMATION		29
Item 1.	Legal Proceedings	29
Item 1A.	Risk Factors	29
Item 6.	Exhibits	30
SIGNATURES		32

2

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q includes a number of forward-looking statements that involve many risks and uncertainties. Forward-looking statements are identified by the use of the words “would,” “could,” “will,” “may,” “expect,” “believe,” “should,” “anticipate,” “if,” “future,” “intend,” “plan,” “estimate,” “potential,” “target,” “seek,” or “continue” and similar words and phrases, including the negatives of these terms, or other variations of these terms, that denote future events. These statements reflect our current views with respect to future events and our potential financial performance and are subject to risks and uncertainties that could cause our actual results and financial position to differ materially and/or adversely from what is projected or implied in any forward-looking statements included in this Form 10-Q. These factors include, but are not limited to: the novel coronavirus pandemic (COVID-19), which has disrupted and may again disrupt our operations, including our manufacturing, research and development, and sales and marketing activities, which in turn could have a material adverse impact on our business and has or could exacerbate the risks discussed below; if demand for our products declines in our major end markets, our net revenues will decrease; our products are sold through distributors, which limits our direct interaction with our end customers, therefore reducing our ability to forecast sales and increasing the complexity of our business; we depend on third-party suppliers to provide us with wafers for our products, and if they fail to provide us sufficient quantities of wafers, our business may suffer; intense competition in the high-voltage power supply industry may lead to a decrease in our average selling price and reduced sales volume of our products; if our products do not penetrate additional markets, our business will not grow as we expect; we do not have long-term contracts with any of our customers and if they fail to place, or if they cancel or reschedule orders for our products, our operating results and our business may suffer; if we are unable to adequately protect or enforce our intellectual property rights, we could lose market share, incur costly litigation expenses, suffer incremental price erosion or lose valuable assets, any of which could harm our operations and negatively impact our profitability; and the other risk factors described under the caption “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2020, and in Part I, Item 2 - “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Quarterly Report on Form 10-Q. We make these forward-looking statements based upon information available on the date of this Form 10-Q, and we expressly disclaim any obligation to update or alter any forward-looking statements, whether as a result of new information or otherwise, except as required by laws.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Quarterly Report on Form 10-Q, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

3

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(In thousands)	March 31, 2021		December 31, 2020
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	343,272	$	258,874
Short-term marketable securities		148,067		190,318
Accounts receivable, net		42,257		35,910
Inventories		90,509		102,878
Prepaid expenses and other current assets		18,207		13,252
Total current assets		642,312		601,232
PROPERTY AND EQUIPMENT, net		168,712		166,188
INTANGIBLE ASSETS, net		11,474		12,506
GOODWILL		91,849		91,849
DEFERRED TAX ASSETS		1,892		3,339
OTHER ASSETS		28,480		28,225
Total assets	$	944,719	$	903,339
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Accounts payable	$	38,172	$	34,712
Accrued payroll and related expenses		13,339		14,806
Taxes payable		856		902
Other accrued liabilities		10,160		12,106
Total current liabilities		62,527		62,526
LONG-TERM INCOME TAXES PAYABLE		14,033		15,588
OTHER LIABILITIES		14,336		14,814
Total liabilities		90,896		92,928
COMMITMENTS AND CONTINGENCIES (Notes 11, 12 and 13)
STOCKHOLDERS’ EQUITY:
Common stock		29		28
Additional paid-in capital		203,051		190,920
Accumulated other comprehensive loss		(2,836)		(2,163)
Retained earnings		653,579		621,626
Total stockholders’ equity		853,823		810,411
Total liabilities and stockholders’ equity	$	944,719	$	903,339

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
NET REVENUES	$	173,737	$	109,664
COST OF REVENUES		89,326		53,184
GROSS PROFIT		84,411		56,480
OPERATING EXPENSES:
Research and development		20,027		19,152
Sales and marketing		14,123		13,473
General and administrative		10,075		8,761
Total operating expenses		44,225		41,386
INCOME FROM OPERATIONS		40,186		15,094
OTHER INCOME		597		1,777
INCOME BEFORE INCOME TAXES		40,783		16,871
PROVISION FOR INCOME TAXES		985		985
NET INCOME	$	39,798	$	15,886
EARNINGS PER SHARE:
Basic	$	0.66	$	0.27
Diluted	$	0.65	$	0.26
SHARES USED IN PER SHARE CALCULATION:
Basic		60,184		59,204
Diluted		61,451		60,268

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. The Earnings Per Share and Shares Used in Per Share Calculation information presented above reflects the effect of the August 2020 two-for-one stock split. Refer to Note 9, Earnings Per Share, in this Form 10-Q for details.

5

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Net income	$	39,798	$	15,886
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in each of the three months ended March 31, 2021 and 2020		(18)		(283)
Unrealized loss on marketable securities, net of $0 tax in each of the three months ended March 31, 2021 and 2020		(580)		(952)
Amortization of defined benefit pension items, net of tax of $135 and $31 in the three months ended March 31, 2021, and 2020, respectively		(75)		51
Total other comprehensive loss		(673)		(1,184)
TOTAL COMPREHENSIVE INCOME	$	39,125	$	14,702

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

6

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Common stock
Beginning balance	$	28	$	28
Common stock issued under employee stock plans		1		—
Repurchase of common stock		—		—
Ending balance		29		28
Additional paid-in capital
Beginning balance		190,920		152,117
Common stock issued under employee stock plans		3,651		5,529
Repurchase of common stock		—		(2,013)
Stock-based compensation		8,480		6,710
Ending balance		203,051		162,343
Accumulated other comprehensive loss
Beginning balance		(2,163)		(3,130)
Other comprehensive loss		(673)		(1,184)
Ending balance		(2,836)		(4,314)
Retained earnings
Beginning balance		621,626		575,531
Net income		39,798		15,886
Payment of dividends to stockholders		(7,845)		(5,644)
Ending balance		653,579		585,773
Total stockholders’ equity	$	853,823	$	743,830

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

7

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Three Months Ended
	March 31,
(In thousands)	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	39,798	$	15,886
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		7,453		5,488
Amortization of intangibles		1,032		1,117
Loss on disposal of property and equipment		17		30
Stock-based compensation expense		8,480		6,710
Amortization of premium on marketable securities		176		154
Deferred income taxes		1,445		1,095
Decrease in accounts receivable allowance for credit losses		(2)		(154)
Change in operating assets and liabilities:
Accounts receivable		(6,345)		3,831
Inventories		12,369		(6,253)
Prepaid expenses and other assets		(3,253)		(3,992)
Accounts payable		3,281		8,828
Taxes payable and accrued liabilities		(6,329)		(6,349)
Net cash provided by operating activities		58,122		26,391
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment		(11,051)		(11,603)
Proceeds from sale of property and equipment		25		—
Purchases of marketable securities		(21,971)		(16,838)
Proceeds from sales and maturities of marketable securities		63,466		15,947
Net cash provided by (used in) investing activities		30,469		(12,494)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans		3,652		5,529
Repurchase of common stock		—		(2,013)
Payments of dividends to stockholders		(7,845)		(5,644)
Net cash used in financing activities		(4,193)		(2,128)
NET INCREASE IN CASH AND CASH EQUIVALENTS		84,398		11,769
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		258,874		178,690
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	343,272	$	190,459
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	$	6,116	$	5,250
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	$	1,512	$	305

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

8

POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION:

The condensed consolidated financial statements include the accounts of Power Integrations, Inc., a Delaware corporation (the “Company”), and its wholly owned subsidiaries. Significant intercompany accounts and transactions have been eliminated in consolidation.

While the financial information furnished is unaudited, the condensed consolidated financial statements included in this report reflect all adjustments (consisting only of normal recurring adjustments) that the Company considers necessary for the fair presentation of the results of operations for the interim periods covered and the financial condition of the Company at the date of the interim balance sheet in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The results for interim periods are not necessarily indicative of the results for the entire year. The condensed consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements and the notes thereto for the year ended December 31, 2020, included in its Form 10-K filed on February 5, 2021, with the Securities and Exchange Commission.

The share and per share information for all periods presented in this Form 10-Q reflects the effect of the August 2020 two-for-one stock split. Refer to Note 8, Stockholders’ Equity, in this Form 10-Q for details.

Certain prior year amounts have been reclassified for consistency with the current year presentation. These reclassifications had no effect on the reported results of operations.

2. SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS:

Significant Accounting Policies and Estimates

No material changes have been made to the Company’s significant accounting policies disclosed in Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, in its Annual Report on Form 10-K, filed on February 5, 2021, for the year ended December 31, 2020.

Recent Accounting Pronouncements

The Company has considered all recent accounting pronouncements issued, but not yet effective, and does not expect any to have a material effect on the Company’s condensed consolidated financial statements.

3. COMPONENTS OF THE COMPANY’S CONDENSED CONSOLIDATED BALANCE SHEETS:

Accounts Receivable

	March 31,		December 31,
(In thousands)	2021		2020
Accounts receivable trade	$	73,382	$	66,703
Allowance for ship and debit		(25,814)		(26,435)
Allowance for stock rotation and rebate		(4,886)		(3,931)
Allowance for credit losses		(425)		(427)
Total	$	42,257	$	35,910

9

POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The Company maintains an allowance for estimated credit losses resulting from the inability of customers to make required payments. This allowance is established using estimates formulated by the Company’s management based upon factors such as the composition of the accounts receivable aging, historical losses, changes in payments patterns, customer creditworthiness, and current economic trends. Receivables determined to be uncollectible are written off and deducted from the allowance.

	Allowance for Credit Losses
	Three Months Ended
	March 31,
(In thousands)	2021		2020
Beginning balance	$	(427)	$	(763)
Provision for credit loss expense		(217)		—
Receivables written off		—		154
Recoveries collected		219		—
Ending balance	$	(425)	$	(609)

Inventories

	March 31,		December 31,
(In thousands)	2021		2020
Raw materials	$	27,042	$	32,131
Work-in-process		37,319		39,469
Finished goods		26,148		31,278
Total	$	90,509	$	102,878

Intangible Assets

	March 31, 2021						December 31, 2020
			Accumulated						Accumulated
(In thousands)	Gross		Amortization		Net		Gross		Amortization		Net
Domain name	$	1,261	$	—	$	1,261	$	1,261	$	—	$	1,261
Developed technology		37,960		(29,882)		8,078		37,960		(29,126)		8,834
Customer relationships		16,700		(15,901)		799		16,700		(15,687)		1,013
Technology licenses		1,926		(590)		1,336		1,926		(528)		1,398
Total intangible assets	$	57,847	$	(46,373)	$	11,474	$	57,847	$	(45,341)	$	12,506

The estimated future amortization expense related to finite-lived intangible assets at March 31, 2021, is as follows:

	Estimated
	Amortization
Fiscal Year	(In thousands)
2021 (remaining nine months)	$	2,462
2022		2,415
2023		2,173
2024		1,279
2025		832
Thereafter		1,052
Total	$	10,213

10

POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for three months ended March 31, 2021 and 2020, were as follows:

	Unrealized Gains
	and Losses on				Defined Benefit						Foreign Currency
	Marketable Securities				Pension Items						Items				Total
	Three Months Ended				Three Months Ended						Three Months Ended				Three Months Ended
	March 31,				March 31,						March 31,				March 31,
(In thousands)	2021		2020		2021			2020			2021		2020		2021		2020
Beginning balance	$	890	$	583	$	(1,641)		$	(2,484)		$	(1,412)	$	(1,229)	$	(2,163)	$	(3,130)
Other comprehensive income (loss) before reclassifications		(580)		(952)		—			—			(18)		(283)		(598)		(1,235)
Amounts reclassified from accumulated other comprehensive loss		—		—		(75)	(1)		51	(1)		—		—		(75)		51
Net-current period other comprehensive income (loss)		(580)		(952)		(75)			51			(18)		(283)		(673)		(1,184)
Ending balance	$	310	$	(369)	$	(1,716)		$	(2,433)		$	(1,430)	$	(1,512)	$	(2,836)	$	(4,314)

(1) This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost for the three months ended March 31, 2021 and 2020.

4. FAIR VALUE MEASUREMENTS:

The FASB established a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices for identical assets in active markets; (Level 2) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.

The Company’s cash equivalents and short-term marketable securities are classified within Level 1 or Level 2 of the fair-value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency.

The fair-value hierarchy of the Company’s cash equivalents and marketable securities at March 31, 2021, and December 31, 2020, was as follows:

	Fair Value Measurement at
	March 31, 2021
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	126,085	$	—	$	126,085
Commercial paper		297,727		—		297,727
Money market funds		13,170		13,170		—
Total	$	436,982	$	13,170	$	423,812

11

POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

	Fair Value Measurement at
	December 31, 2020
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	146,658	$	—	$	146,658
Commercial paper		253,855		—		253,855
Money market funds		1,634		1,634		—
Total	$	402,147	$	1,634	$	400,513

The Company did not transfer any investments between Level 1 and Level 2 of the fair-value hierarchy in the three months ended March 31, 2021, and the twelve months ended December 31, 2020.

5. MARKETABLE SECURITIES:

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2021, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	1,999	$	—	$	—	$	1,999
Corporate securities		94,676		107		—		94,783
Total		96,675		107		—		96,782
Investments due in 4-12 months:
Commercial paper		19,983		—		—		19,983
Corporate securities		31,099		203		—		31,302
Total		51,082		203		—		51,285
Total marketable securities	$	147,757	$	310	$	—	$	148,067

Accrued interest receivable was $1.2 million at March 31, 2021 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet.

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2020, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	43,660	$	—	$	—	$	43,660
Corporate securities		19,846		44		—		19,890
Total		63,506		44		—		63,550
Investments due in 4-12 months:
Corporate securities		125,922		846		—		126,768
Total		125,922		846		—		126,768
Total marketable securities	$	189,428	$	890	$	—	$	190,318

Accrued interest receivable was $0.8 million at December 31, 2020 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet.

12

POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

6. STOCK-BASED COMPENSATION:

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2021, and March 31, 2020:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cost of revenues	$	631	$	396
Research and development		2,391		2,109
Sales and marketing		1,614		1,392
General and administrative		3,844		2,813
Total stock-based compensation expense	$	8,480	$	6,710

Stock-based compensation expense in the three months ended March 31, 2021, was approximately $8.5 million, comprising approximately $5.3 million related to restricted stock unit (RSU) awards, $2.7 million related to performance-based (PSU) awards and long-term performance-based (PRSU) awards and $0.5 million related to the Company’s employee stock purchase plan.

In the three months ended March 31, 2020, stock-based compensation expense was approximately $6.7 million, comprising approximately $5.0 million related to RSUs, $1.3 million related to PSUs and PRSUs and $0.4 million related to the Company’s employee stock purchase plan.

Stock Options

A summary of stock options outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
				Average
		Weighted-		Remaining
		Average		Contractual	Aggregate
	Shares	Exercise		Term	Intrinsic Value
	(In thousands)	Price		(In years)	(In thousands)
Outstanding at January 1, 2021	92	$	20.63
Granted	—		—
Exercised	(33)	$	19.15
Forfeited or expired	—		—
Outstanding at March 31, 2021	59	$	21.44	1.1	$	3,568
Vested and exercisable at March 31, 2021	59			1.1	$	3,568

PSU Awards

Under the performance-based awards program, the Company grants awards in the performance year in an amount equal to twice the target number of shares to be issued if the maximum performance metrics are met. The number of shares that are released at the end of the performance year can range from zero to 200% of the target number depending on the Company’s performance. The performance metrics of this program are annual targets consisting of a combination of net revenue, non-GAAP operating income and strategic goals.

As the net revenue, non-GAAP operating income and strategic goals are considered performance conditions, expense associated with these awards, net of estimated forfeitures, is recognized over the service period based on an assessment of the achievement of the performance targets. The fair value of these PSUs is determined using the fair value of the Company’s common stock on the date of the grant, reduced by the discounted present value of dividends expected to be declared before the awards vest. If the performance conditions are not achieved, no compensation cost is recognized and any previously recognized compensation is reversed.

In January 2021, it was determined that approximately 150,000 shares subject to the PSUs granted in 2020 vested in aggregate; the shares were released to the Company’s employees and executives in the first quarter of 2021.

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

A summary of PSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
	Shares	Grant Date Fair		Contractual Term	Intrinsic Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	150	$	46.27
Granted	57	$	84.05
Vested	(150)	$	46.27
Forfeited	—		—
Outstanding at March 31, 2021	57	$	84.05	0.75	$	4,682
Outstanding and expected to vest at March 31, 2021	57			0.75	$	4,682

PRSU Awards

The Company’s PRSU program provides for the issuance of PRSUs which will vest based on the Company’s performance measured against the PRSU program’s established performance targets. PRSUs are granted in an amount equal to twice the target number of shares to be issued if the maximum performance metrics are met. The actual number of shares the recipient receives is determined at the end of a three-year performance period based on results achieved versus the Company’s performance goals, and may range from zero to 200% of the target number. The performance goals for PRSUs granted in fiscal 2019 were based on the Company’s annual revenue growth, while the PRSUs granted in 2020 and 2021 were based on the Company’s compound annual growth rate (“CAGR”) of revenue as measured against the revenue CAGR of the analog semiconductor industry, in each case over the respective three-year performance period. Expense associated with these awards, net of estimated forfeitures, is recorded throughout the year based on an assessment of the expected achievement of the performance targets. If the performance conditions are not achieved, no compensation cost is recognized and any previously recognized compensation is reversed.

In January 2021 it was determined that approximately 6,000 shares subject to the PRSUs granted in 2018 vested in aggregate; the shares were released to the Company’s executives in the first quarter of 2021.

A summary of PRSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	301	$	41.90
Granted	97	$	83.01
Vested	(6)	$	29.95
Forfeited	(15)	$	40.05
Outstanding at March 31, 2021	377	$	52.75	1.65	$	30,737
Outstanding and expected to vest at March 31, 2021	377			1.65	$	30,737

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

RSU Awards

A summary of RSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	1,518	$	35.51
Granted	89	$	82.50
Vested	(209)	$	34.57
Forfeited	(39)	$	35.73
Outstanding at March 31, 2021	1,359	$	38.72	1.83	$	110,731
Outstanding and expected to vest at March 31, 2021	1,273			1.38	$	103,716

7. SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES:

Segment Reporting

The Company is organized and operates as one reportable segment, the design, development, manufacture and marketing of integrated circuits and related components for use primarily in the high-voltage power-conversion market. The Company’s chief operating decision maker, the Chief Executive Officer, reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance.

Customer Concentration

The Company’s top ten customers accounted for approximately 79% of net revenues for the three months ended March 31, 2021, and approximately 55% in the corresponding period of 2020. A significant portion of these revenues are attributable to sales of the Company’s products to distributors of electronic components. These distributors sell the Company’s products to a broad, diverse range of end users, including original equipment manufacturers, or OEMs, and merchant power supply manufacturers. Sales to distributors were $134.2 million in the three months ended March 31, 2021, and $83.5 million for the corresponding period of 2020. Direct sales to OEMs and power-supply manufacturers accounted for the remainder.

The following customers represented 10% or more of the Company’s net revenues for the respective periods:

	Three Months Ended
	March 31,
Customer	2021		2020
Avnet	31	%	11	%
Honestar Technologies Co., Ltd.	18	%	*
Powertech Distribution Ltd.	*		11	%

* Total customer revenue was less than 10% of net revenues.

No other customers accounted for 10% or more of the Company’s net revenues in the periods presented.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company does not have any off-balance-sheet credit exposure related to its customers. As of March 31, 2021, and December 31, 2020, 86% and 90%, respectively, of accounts receivable were concentrated with the Company’s top ten customers.

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following customers represented 10% or more of accounts receivable:

	March 31,		December 31,
Customer	2021		2020
Avnet	58	%	50	%
Powertech Distribution Ltd.	*		10	%

*   Total customer accounts receivable was less than 10% of accounts receivable.

No other customers accounted for 10% or more of the Company’s accounts receivable in the periods presented.

Geographic Net Revenues

The Company markets its products globally through its sales personnel and a worldwide network of independent sales representatives and distributors. Geographic net revenues, based on “bill to” customer locations, for the three months ended March 31, 2021, and March 31, 2020, were as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
United States of America	$	4,100	$	2,713
Hong Kong/China		118,730		60,413
Taiwan		6,442		6,479
Korea		12,489		10,357
Western Europe (excluding Germany)		7,130		10,035
Japan		4,647		3,905
Germany		7,006		5,567
Other		13,193		10,195
Total net revenues	$	173,737	$	109,664

8. STOCKHOLDERS’ EQUITY:

Common Stock Shares Outstanding

	Three Months Ended
	March 31,
(In thousands)		2021	2020
Beginning balance		59,910	58,862
Common stock issued under employee stock plans		453	568
Repurchased		—	(48)
Ending balance		60,363	59,382

In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend, payable on August 18, 2020, to stockholders of record as of the close of business on August 14, 2020. The Company’s stockholders received one additional share of common stock for each share of common stock held on August 14, 2020. The share and per share information for all periods presented in this Form 10-Q reflects the effect of the stock split.

Common Stock Repurchases

The Company did not repurchase any common stock during the three months ended March 31, 2021. As of March 31, 2021, the Company had approximately $41.3 million remaining under its current repurchase program, which has no expiration date. In April 2021, the Company’s board of directors authorized the use of an additional $50.0 million for the repurchase of the Company’s common stock, with repurchases to be executed according to pre-defined price/volume guidelines. Authorization of future repurchase programs 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.

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Cash Dividends

In October 2019, the Company’s board of directors declared four quarterly cash dividends of $0.095 per share to be paid to stockholders of record at the end of each quarter in 2020. In April 2020, the Company’s board of directors raised the cash dividends with the declaration of three cash dividends of $0.105 per share (in lieu of the $0.095 per share previously announced in October 2019) to be paid to stockholders of record at the end of each of the second, third and fourth quarter in 2020. In July 2020, the Company’s board of directors raised the cash dividends further with the declaration of two cash dividends of $0.11 per share (in lieu of the $0.105 per share announced in April 2020) to be paid to stockholders of record at the end of each of the third and fourth quarter in 2020.

In January 2021, the Company’s board of directors raised the quarterly cash dividend by an additional $0.02 per share with the declaration of four cash dividends of $0.13 per share to be paid to stockholders of record at the end of each quarter in 2021.

For the three months ended March 31, 2021, and 2020, cash dividends declared and paid were as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Dividends declared and paid	$	7,845	$	5,644
Dividends declared per common share	$	0.13	$	0.095

9. EARNINGS PER SHARE:

Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under the stock purchase plan and contingently issuable performance-based awards, as computed using the treasury stock method.

A summary of the earnings per share calculation is as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Basic earnings per share:
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Basic earnings per share	$	0.66	$	0.27
Diluted earnings per share: (1)
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Effect of dilutive awards:
Employee stock plans		1,267		1,064
Diluted weighted-average common shares		61,451		60,268
Diluted earnings per share	$	0.65	$	0.26

(1) The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2021 and 2020 calculations as the shares were not contingently issuable as of the end of the reporting periods.

In the three months ended March 31, 2021 and 2020, no outstanding stock awards were determined to be anti-dilutive and therefore excluded from the computation of diluted earnings per share.

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend to stockholders of record as of the close of business on August 14, 2020. Refer to Note 8, Stockholders’ Equity, for additional information. The share and per share information for all periods presented in this Form 10-Q reflects the effect of the stock split.

10. PROVISION FOR INCOME TAXES:

Income-tax expense includes a provision for federal, state and foreign taxes based on the annual estimated effective tax rate applicable to the Company and its subsidiaries, adjusted for certain discrete items which are fully recognized in the period they occur. Accordingly, the interim effective tax rate may not be reflective of the annual estimated effective tax rate.

The Company’s effective tax rates for the three months ended March 31, 2021 and 2020, were 2.4% and 5.8%, respectively. In the three months ended March 31, 2021 and 2020, the effective tax rate was lower than the statutory federal income-tax rate of 21% due to the geographic distribution of the Company’s world-wide earnings in lower-tax jurisdictions, federal research tax credits and the recognition of excess tax benefits related to share-based payments. Additionally, in the three months ended March 31, 2021, the Company’s effective tax rate was favorably impacted by a discrete item associated with the release of an unrecognized tax benefit. These benefits were partially offset by foreign income subject to U.S. tax, known as global intangible low-taxed income. The Company’s primary jurisdiction where foreign earnings are derived is the Cayman Islands, which is a non-taxing jurisdiction. Income earned in other foreign jurisdictions was not material. The Company has not been granted any incentivized tax rates and does not operate under any tax holidays in any jurisdiction.

As of March 31, 2021, the Company maintained a valuation allowance on its California deferred tax assets, New Jersey deferred tax assets, and capital losses for federal purposes, and a valuation allowance with respect to its deferred tax assets relating to tax credits in Canada.

Determining the consolidated provision for income-tax expense, income-tax liabilities and deferred tax assets and liabilities involves judgment. The Company calculates and provides for income taxes in each of the tax jurisdictions in which it operates, which involves estimating current tax exposures as well as making judgments regarding the recoverability of deferred tax assets in each jurisdiction. The estimates used could differ from actual results, which may have a significant impact on operating results in future periods.

11. COMMITMENTS:

Supplier Agreements

Under the terms of the Company’s wafer-supply agreements with Seiko Epson Corporation ("Epson"), and ROHM Lapis Semiconductor Co., Ltd. ("Lapis") the wafers purchased from these suppliers are priced in U.S. dollars, with mutual sharing of the impact of fluctuations in the exchange rate between the Japanese yen and the U.S. dollar on future purchases. Each year, the Company’s management and these two suppliers review and negotiate future pricing; the negotiated pricing is denominated in U.S. dollars but is subject to contractual exchange rate provisions. The fluctuation in the exchange rate is shared equally between the Company and each of these suppliers on future purchases.

12. LEGAL PROCEEDINGS AND CONTINGENCIES:

From time to time in the ordinary course of business, the Company becomes involved in lawsuits, or customers and distributors may make claims against the Company. In accordance with ASC 450-10, Contingencies, the Company makes a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

On April 1, 2016, Opticurrent, LLC filed a complaint against the Company in the United States District Court for the Eastern District of Texas alleging that the Company infringed one patent pertaining to transistor switch devices and seeking damages for the alleged infringement. The Company filed a motion to transfer the case to the Northern District of California, which the Court granted, and the case was assigned to a new judge in San Francisco following the transfer. On December 21, 2018, the Court granted the Company’s challenge to Opticurrent’s damages expert but denied the Company’s motion for summary judgment. Following a trial in February 2019, a jury issued a finding of direct

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POWER INTEGRATIONS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Continued)

infringement by the Company but found that the Company did not induce infringement, and awarded Opticurrent damages of $6.7 million. The Company challenged those findings in post-trial proceedings, and the Court granted one of the Company’s post-trial motions, reducing the damages award to $1.2 million. The Court of Appeals affirmed the original findings and the reduced damages award, but the Company believes Opticurrent made key disclaimers during reexamination proceedings after the original trial, giving rise to a motion to set aside the original judgment in view of a disclaimer, an issue that is currently on appeal to the Federal Circuit. Briefing on the Company’s appeal is expected to take place over the coming months, with oral argument and a ruling thereafter. The District Court has issued an order staying execution on the original judgment pending the Company’s appeal. As such, the Company continues to believe it has strong defenses, and intends to continue to vigorously defend itself against Opticurrent’s claims.

On June 19, 2019, Opticurrent, LLC filed a follow-on lawsuit in the United States District Court for the Northern District of California accusing more of the Company’s products of infringement and seeking damages for the alleged infringement of the same claim of the same patent asserted in the parties’ prior litigation, as described above. Limited discovery has taken place, but proceedings are currently stayed, and no schedule has yet been set for expert discovery, dispositive motions, or trial. The Company believes it has strong defenses, independent of the issue on appeal in the first case, and intends to vigorously defend itself against Opticurrent’s claims, with appeals to follow if necessary.

On January 6, 2020, the Company filed a complaint against CogniPower LLC in the United States District Court for the District of Delaware for infringement of two of the Company’s patents and seeking a declaration of non-infringement with respect to patents that CogniPower had charged the Company’s customers with infringing, based on customer use of the Company’s products. In response, CogniPower filed a motion to dismiss the Company’s declaratory judgment claims on the basis that CogniPower had not threatened the Company directly with suit. That motion was granted, so CogniPower’s claims for infringement initially went forward separately in their lawsuit against the Company’s customers in the District of Delaware, but the Company filed a motion to intervene in that lawsuit and received a ruling allowing the Company to intervene in CogniPower’s customer lawsuit on February 1, 2021. Fact discovery is now under way, but the Company believes it has strong claims and defenses, and intends to vigorously defend itself against CogniPower’s claims against the Company’s technology, with appeals to follow if necessary.

The Company is unable to predict the outcome of legal proceedings with certainty, and there can be no assurance that the Company will prevail in the above-mentioned unsettled litigations. These litigations, whether or not determined in the Company’s favor or settled, will be costly and will divert the efforts and attention of the Company’s management and technical personnel from normal business operations, potentially causing a material adverse effect on the business, financial condition and operating results. Currently, the Company is not able to estimate a loss or a range of loss for the ongoing litigation disclosed above, however adverse determinations in litigation could result in monetary losses, the loss of proprietary rights, subject the Company to significant liabilities, require the Company to seek licenses from third parties or prevent the Company from licensing the technology, any of which could have a material adverse effect on the Company’s business, financial condition and operating results.

13. INDEMNIFICATIONS:

The Company sells products to its distributors under contracts, collectively referred to as Distributor Sales Agreements (“DSA”). Each DSA contains the relevant terms of the contractual arrangement with the distributor, and generally includes certain provisions for indemnifying the distributor against losses, expenses, and liabilities from damages that may be awarded against the distributor in the event the Company’s products are found to infringe upon a patent, copyright, trademark, or other proprietary right of a third party (“Customer Indemnification”). The DSA generally limits the scope of and remedies for the Customer Indemnification obligations in a variety of industry-standard respects, including, but not limited to, limitations based on time and geography, and a right to replace an infringing product. The Company also, from time to time, has granted a specific indemnification right to individual customers.

The Company believes its internal development processes and other policies and practices limit its exposure related to such indemnifications. In addition, the Company requires its employees to sign a proprietary information and inventions agreement, which assigns the rights to its employees’ development work to the Company. To date, the Company has not had to reimburse any of its distributors or customers for any losses related to these indemnifications and no material claims were outstanding as of March 31, 2021. For several reasons, including the lack of prior indemnification claims and the lack of a monetary liability limit for certain infringement cases, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnifications.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and our results of operations should be read in conjunction with the condensed consolidated financial statements and the notes to those statements included elsewhere in this Quarterly Report on Form 10-Q, and with the consolidated financial statements and management’s discussion and analysis of our financial condition and results of operations in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 5, 2021. This discussion contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those contained in these forward-looking statements due to a number of factors, including those discussed under the caption “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2020, and in Part II, Item 1A - “Risk Factors” and elsewhere in this report. See also “Cautionary Note Regarding Forward-Looking Statements” at the beginning of this report.

Overview

We design, develop and market analog and mixed-signal integrated circuits (ICs) and other electronic components and circuitry used in high-voltage power conversion. Our products are used in power converters that convert electricity from a high-voltage source to the type of power required for a specified downstream use. In most cases, this conversion entails, among other functions, converting alternating current (AC) to direct current (DC) or vice versa, reducing or increasing the voltage, and regulating the output voltage and/or current according to the customer’s specifications.

A large percentage of our products are ICs used in AC-DC power supplies, which convert the high-voltage AC from a wall outlet to the low-voltage DC required by most electronic devices. Power supplies incorporating our products are used with all manner of electronic products including mobile phones, computing and networking equipment, appliances, electronic utility meters, battery-powered tools, industrial controls, and “home-automation,” or “internet of things” applications such as networked thermostats, power strips and security devices. We also supply high-voltage LED drivers, which are AC-DC ICs specifically designed for lighting applications that utilize light-emitting diodes, and motor-driver ICs addressing brushless DC (BLDC) motors used in refrigerators, HVAC systems, ceiling fans and other consumer-appliance and light commercial applications.

We also offer high-voltage gate drivers—either standalone ICs or circuit boards containing ICs, electrical isolation components and other circuitry—used to operate high-voltage switches such as insulated-gate bipolar transistors (IGBTs) and silicon-carbide (SiC) MOSFETs. These combinations of switches and drivers are used for power conversion in high-power applications (i.e., power levels ranging from a few kilowatts up to gigawatts) such as industrial motors, solar- and wind-power systems, electric vehicles (EVs) and high-voltage DC transmission systems.

Our products bring a number of important benefits to the power-conversion market compared with less advanced alternatives, including reduced component count and design complexity, smaller size, higher reliability and reduced time-to-market. Our products also reduce the energy consumption of power converters during normal use and in “standby” operation, when the end product is not in use. In addition to the environmental benefits of reduced energy usage, our energy-saving technologies provide a number of benefits to our customers; these include helping them meet the increasingly stringent efficiency standards now in effect for many electronic products, and enabling the elimination of bulky heatsinks used to dissipate heat produced by wasted electricity.

While the size of our addressable market fluctuates with changes in macroeconomic and industry conditions, the market has generally exhibited a modest growth rate over time as growth in the unit volume of power converters has been offset to a large degree by reductions in the average selling price of components in this market. Therefore, the growth of our business depends largely on increasing our penetration of the markets that we serve and on further expanding our addressable market. Our growth strategy includes the following elements:

● Increase our penetration of the markets we serve. We currently address AC-DC applications with power outputs up to approximately 500 watts, gate-driver applications ranging from a few kilowatts up to gigawatts, and motor-drive applications up to approximately 400 watts. Through our research and development efforts, we seek to introduce more advanced products for these markets offering higher levels of integration and performance compared to earlier products. We also continue to expand our sales and application-engineering staff and our network of distributors, as well as our offerings of technical documentation and design-support tools and services to help customers use our products. These tools

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and services include our PI Expert™ design software, which we offer free of charge, and our transformer-sample service.

Our market-penetration strategy also includes capitalizing on the importance of energy efficiency and renewable energy in the power conversion market. For example, our EcoSmart™ technology drastically reduces the amount of energy consumed by electronic products when they are not in use, helping our customers comply with regulations that seek to curb this so-called “standby” energy consumption. Also, our gate-driver products are critical components in energy-efficient DC motor drives, high-voltage DC transmission systems, solar and wind energy systems and electric transportation applications.

● Increase the size of our addressable market. Prior to 2010 our addressable market consisted of AC-DC applications with up to about 50 watts of output, a served available market (SAM) opportunity of approximately $1.5 billion. Since that time we have expanded our SAM to more than $4 billion through a variety of means. These include the introduction of products that enable us to address higher-power AC-DC applications (such as our Hiper™ product families), the introduction of LED-driver products, and our entry into the gate-driver market through the acquisition of CT-Concept Technologie AG in 2012. In 2016 we introduced the SCALE-iDriver^TM family of ICs, broadening the range of gate-driver applications we can address, and in 2018 we introduced our BridgeSwitch™ motor-driver ICs, addressing BLDC motors, as described above. We have recently introduced a series of automotive-qualified versions of our products, including SCALE-iDriver, InnoSwitch^TM and LinkSwitch™ ICs, targeting the EV market; we expect to introduce additional products targeting EVs in the future, and expect automotive applications to become a significant portion of our SAM over time.

Also contributing to our SAM expansion has been the emergence of new applications within the power ranges that our products can address. For example, applications such as “smart” utility meters, battery-powered lawn equipment and bicycles, and USB power receptacles (often installed alongside traditional AC wall outlets) can incorporate our products. The increased use of electronic intelligence and connectivity in consumer appliances has also enhanced our SAM. Finally, we have enhanced our SAM through the development of new technologies that increase the value (and therefore the average selling prices) of our products. For example, our InnoSwitch™ ICs integrate circuitry from the secondary, or low-voltage, side of AC-DC power supplies, whereas earlier product families integrated circuitry only on the primary, or high-voltage side. In 2019, we began incorporating proprietary gallium-nitride (GaN) transistors in some products, enabling a higher level of energy efficiency than ICs with traditional silicon transistors.

We intend to continue expanding our SAM in the years ahead through all of the means described above.

Our quarterly operating results are difficult to predict and subject to significant fluctuations. We plan our production and inventory levels based on internal forecasts of projected customer demand, which are highly unpredictable and can fluctuate substantially. Customers typically may cancel or reschedule orders on short notice without significant penalty and, conversely, often place orders with very short lead times to delivery. Also, external factors such as global economic conditions and supply-chain dynamics can cause our operating results to be volatile. In particular, the severe economic disruption caused by the global novel coronavirus pandemic (COVID-19) may affect the supply of and demand for our products and make our results more difficult to forecast. Furthermore, because our industry is intensely price-sensitive, our gross margin (gross profit divided by net revenues) is subject to change based on the relative pricing of solutions that compete with ours. Variations in product mix, end-market mix and customer mix can also cause our gross margin to fluctuate. Because we purchase a large percentage of our silicon wafers from foundries located in Japan, our gross margin is influenced by fluctuations in the exchange rate between the U.S. dollar and the Japanese yen. Changes in the prices of raw materials used in our products, such as copper and gold, can also affect our gross margin. Although our wafer-fabrication and assembly operations are outsourced, as are most of our test operations, a portion of our production costs are fixed in nature. As a result, our unit costs and gross margin are impacted by the volume of units we produce.

Recent Results

Our net revenues were $173.7 million and $109.7 million in the three months ended March 31, 2021 and 2020, respectively. The increase in revenues reflects the strong demand conditions currently prevalent across the semiconductor industry. While all of our end-market categories exhibited strong growth, revenues from the communications and computer end markets nearly tripled collectively as a result of growing demand for advanced chargers for mobile phones and tablets

21

and our market-share gains in these applications. Also contributing to the growth in the computer category was increased sales for desktop computers and monitors reflecting the ongoing work-from-home and learn-from-home trends precipitated by the pandemic.

Our top ten customers, including distributors that resell to original equipment manufacturers, or OEMs, and merchant power supply manufacturers, accounted for 79% of net revenues in the three months ended March 31, 2021, and 55% of net revenues in the corresponding period of 2020. In the three months ended March 31, 2021, two customers, distributors of our products, accounted for 31% and 18% of our net revenues, respectively. In the three months ended March 31, 2020, two customers, distributors of our products, each accounted for 11% of our net revenues. International sales accounted for 98% of our net revenues in each of the three months ended March 31, 2021, and 2020.

Our gross margin was 48.6% and 51.5% in the three months ended March 31, 2021 and 2020, respectively. The decrease in gross margin was due to an unfavorable change in end-market mix with a greater amount of revenues coming from lower-margin end markets.

Total operating expenses were $44.2 million and $41.4 million in the three months ended March 31, 2021 and 2020, respectively. The increase in operating expenses was due primarily to higher salary and related expenses driven by increased headcount and annual merit increases, as well as higher stock-based compensation expense related to performance-based awards.

COVID-19 Pandemic

The COVID-19 pandemic has disrupted everyday life and markets worldwide, and governments around the world have imposed restrictions aimed at controlling the spread of the virus, including shelter-in-place orders, travel restrictions, business shutdowns and border closures. Beginning March 16, 2020 our San Jose headquarters location was subject to a shelter-in-place order, under which most of our employees were required to work from home; other locations around the world have also been subject to such restrictions. We will begin a phased reopening of our San Jose headquarters when these restrictions are lifted. Some of our employees in other locations around the world have returned to the office under a phased reopening plan. We have implemented a variety of measures to protect the health and safety of our employees, including the provision of masks, gloves and sanitizers, social-distancing rules, and regular deep cleaning of our facilities.

While we have been able to conduct our day-to-day operations effectively in spite of the restrictions caused by the pandemic, in early 2020, the pandemic caused some disruptions in our supply chain. While our supply of wafers from our foundry partners was not interrupted, government-mandated closures in China, Malaysia, Sri Lanka and the Philippines caused temporary shutdowns at our assembly and test sub-contractors in those countries; all of the affected sub-contractors had resumed operations by the end of 2020. While these disruptions resulted in delayed shipments to some customers early in 2020, our results were not materially affected due to a variety of mitigation measures including higher-than-normal inventories of wafers and finished goods, safety stocks of certain key inputs, and multiple sources for components for most of our products.

Despite the economic downturn stemming from the pandemic, demand for goods incorporating our products is strong. While the future trajectory of demand is uncertain, we believe our business is fundamentally sound with strong, long-term growth prospects. We have increased headcount and intend to continue investing in research and development and other functions necessary to support our future growth. We also intend to continue our cash dividend and stock repurchase programs; however, if the economy deteriorates more than we expect or our business outlook changes, our board of directors may choose to suspend or alter these programs at its discretion. For additional discussion regarding COVID-19 business risks refer to Part I, Item 1A “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2020.

Critical Accounting Policies and Estimates

The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, we evaluate our estimates, including those listed below. We base our estimates on historical facts and various other assumptions that we believe to be reasonable at the time the estimates are made. Actual results could differ from those estimates.

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Our critical accounting policies are as follows:

● revenue recognition; and

● income taxes.

Our critical accounting policies are important to the portrayal of our financial condition and results of operations, and require us to make judgments and estimates about matters that are inherently uncertain. There have been no material changes to our critical accounting policies and estimates disclosed in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies and Estimates” and Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, in each case in our Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 5, 2021.

Results of Operations

The following table sets forth certain operating data as a percentage of net revenues for the periods indicated.

	Three Months Ended
	March 31,
	2021		2020
Net revenues	100.0	%	100.0	%
Cost of revenues	51.4		48.5
Gross profit	48.6		51.5
Operating expenses:
Research and development	11.5		17.4
Sales and marketing	8.1		12.3
General and administrative	5.8		8.0
Total operating expenses	25.4		37.7
Income from operations	23.2		13.8
Other income	0.3		1.6
Income before income taxes	23.5		15.4
Provision for income taxes	0.6		0.9
Net income	22.9	%	14.5	%

Comparison of the Three Months Ended March 31, 2021 and 2020

Net revenues. Net revenues consist of revenues from product sales, which are calculated net of returns and allowances. Net revenues for the three months ended March 31, 2021 and 2020 were $173.7 million and $109.7 million, respectively. The increase in revenues reflects the strong demand conditions currently prevalent across the semiconductor industry. While all of our end-market categories exhibited strong growth, revenues from the communications and computer end markets nearly tripled collectively as a result of growing demand for advanced chargers for mobile phones and tablets and our market-share gains in these applications. Also contributing to the growth in the computer category was increased sales for desktop computers and monitors reflecting the ongoing work-from-home and learn-from-home trends precipitated by the pandemic.

Our revenue mix by end market for the three months ended March 31, 2021 and 2020 was as follows:

	Three Months Ended
	March 31,
End Market	2021		2020
Communications	38	%	22	%
Computer	8	%	4	%
Consumer	29	%	41	%
Industrial	25	%	33	%

International sales, consisting of sales outside of the United States of America based on “bill to” customer locations, were $169.6 million and $107.0 million in the three months ended March 31, 2021 and 2020, respectively. Although power converters using our products are distributed to end markets worldwide, most are manufactured in Asia. As a result, sales to this region represented 85% and 75% of our net revenues in the three months ended March 31, 2021

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and 2020 respectively. We expect international sales, and sales to the Asia region in particular, to continue to account for a large portion of our net revenues in the future.

Sales to distributors accounted for 77% and 76% of net revenues in the three months ended March 31, 2021 and 2020. Direct sales to OEMs and power-supply manufacturers accounted for the remainder.

The following customers represented 10% or more of our net revenues for the respective periods:

	Three Months Ended
		March 31,
Customer		2021		2020
Avnet		31	%	11	%
Honestar Technologies Co., Ltd.		18	%	*
Powertech Distribution Ltd.		*		11	%

* Total customer revenue was less than 10% of net revenues.

No other customers accounted for 10% or more of our net revenues in these periods.

Gross profit. Gross profit is net revenues less cost of revenues. Our cost of revenues consists primarily of costs associated with the purchase of wafers from our contracted foundries, the assembly, packaging and testing of our products by sub-contractors, product testing performed in our own facilities, amortization of acquired intangible assets, and overhead associated with the management of our supply chain. Gross margin is gross profit divided by net revenues. The table below compares gross profit and gross margin for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Net revenues	$	173.7		$	109.7
Gross profit	$	84.4		$	56.5
Gross margin		48.6	%		51.5	%

The increase in gross profit was due to the increase in revenues. The decrease in gross margin was due primarily to an unfavorable change in end-market mix with a greater percentage of revenues coming from lower-margin end markets.

Research and development expenses. Research and development (“R&D”) expenses consist primarily of employee-related expenses, including stock-based compensation, and expensed material and facility costs associated with the development of new technologies and new products. We also record R&D expenses for prototype wafers related to new products until such products are released to production. The table below compares R&D expenses for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Net revenues	$	173.7		$	109.7
R&D expenses	$	20.0		$	19.2
Percentage of net revenues		11.5	%		17.4	%

The increase in R&D expenses was due primarily to higher salary and related expenses driven by increased headcount and annual merit increases, as well as higher stock-based compensation expense related to performance-based awards.

Sales and marketing expenses. Sales and marketing (“S&M”) expenses consist primarily of employee-related expenses, including stock-based compensation, commissions to sales representatives, amortization of intangible assets and

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facilities expenses, including expenses associated with our regional sales and support offices. The table below compares S&M expenses for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Net revenues	$	173.7		$	109.7
Sales and marketing expenses	$	14.1		$	13.5
Percentage of net revenues		8.1	%		12.3	%

The increase in S&M expenses was due primarily by increased commission expense driven by increased sales, higher salary and related expenses stemming from annual merit increases, and higher stock-based compensation expense primarily related to performance-based awards. These factors were partially offset by lower travel expenses resulting from restrictions associated with the COVID-19 pandemic that went into effect at the end of the first quarter of 2020.

General and administrative expenses. General and administrative (“G&A”) expenses consist primarily of employee-related expenses, including stock-based compensation expenses, for administration, finance, human resources and general management, as well as consulting, professional services, legal and audit expenses. The table below compares G&A expenses for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Net revenues	$	173.7		$	109.7
G&A expenses	$	10.1		$	8.8
Percentage of net revenues		5.8	%		8.0	%

The increase in G&A expenses was due primarily to higher stock-based compensation expense related to performance-based awards and higher salary and related expenses stemming from annual merit increases.

Other income. Other income consists primarily of interest income earned on cash and cash equivalents, marketable securities and other investments, and the impact of foreign exchange gains or losses. The table below compares other income for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Net revenues	$	173.7		$	109.7
Other income	$	0.6		$	1.8
Percentage of net revenues		0.3	%		1.6	%

Other income decreased due primarily to lower interest income, as lower yields on our cash and investments more than offset the impact of higher cash and investment balances.

Provision for income taxes. Provision for income taxes represents federal, state and foreign taxes. The table below compares income-tax expense for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
(dollars in millions)	2021			2020
Income before income taxes	$	40.8		$	16.9
Provision for income taxes	$	1.0		$	1.0
Effective tax rate		2.4	%		5.8	%

Income-tax expense includes a provision for federal, state and foreign taxes based on the annual estimated effective tax rate applicable to us and our subsidiaries, adjusted for certain discrete items which are fully recognized in the period in which they occur. Accordingly, the interim effective tax rate may not be reflective of the annual estimated effective tax rate.

Our effective tax rates for the three months ended March 31, 2021 and 2020 were 2.4% and 5.8%, respectively. The effective tax rate in these periods was lower than the statutory federal income-tax rate of 21% due to the geographic

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distribution of our world-wide earnings in lower-tax jurisdictions, the impact of federal research tax credits and the recognition of excess tax benefits related to share-based payments. Additionally, in the three months ended March 31, 2021, our effective tax rate was favorably impacted by a discrete item associated with the release of an unrecognized tax benefit. These benefits were partially offset by U.S. tax on foreign income, known as global intangible low-taxed income. The primary jurisdiction from which our foreign earnings are derived is the Cayman Islands, which is a non-taxing jurisdiction. Income earned in other foreign jurisdictions was not material. We have not been granted any incentivized tax rates and do not operate under any tax holidays in any jurisdiction.

Liquidity and Capital Resources

As of March 31, 2021, we had $491.3 million in cash, cash equivalents and short-term marketable securities, an increase of approximately $42.1 million from $449.2 million as of December 31, 2020. As of March 31, 2021, we had working capital, defined as current assets less current liabilities, of $579.8 million, an increase of approximately $41.1 million from $538.7 million as of December 31, 2020.

We have a Credit Agreement with a bank (the "Credit Agreement") that provides us with a $75.0 million revolving line of credit to use for general corporate purposes with a $20.0 million sub-limit for the issuance of standby and trade letters of credit. Our ability to borrow under the revolving line of credit is conditioned upon our compliance with specified covenants, including reporting and financial covenants, primarily a minimum liquidity measure and a debt to earnings ratio, with which we are currently in compliance. The Credit Agreement terminates on April 30, 2022; all advances under the revolving line of credit will become due on such date, or earlier in the event of a default. No advances were outstanding under the agreement as of March 31, 2021.

Cash From Operating Activities

Operating activities generated cash of $58.1 million in the three months ended March 31, 2021. Net income for this period was $39.8 million; we also incurred non-cash stock-based compensation expense, depreciation, deferred income taxes, and amortization of $8.5 million, $7.5 million, $1.4 million and $1.0 million, respectively. Sources of cash also included a $12.4 million decrease in inventory reflecting strong demand for the period and a $3.3 million increase in accounts payable (excluding payables related to property and equipment) due to the timing of payments. These sources of cash were partially offset by $6.3 million decrease in taxes payable and accrued liabilities, a $6.3 million increase in accounts receivable due to increased customer shipments, and a $3.3 million increase in prepaid expense and other assets, primarily due to prepaid insurances and income taxes.

Operating activities generated cash of $26.4 million in the three months ended March 31, 2020. Net income for this period was $15.9 million; we also incurred non-cash stock-based compensation expense, depreciation, amortization and deferred income taxes of $6.7 million, $5.5 million, $1.1 million and $1.1 million, respectively. Sources of cash also included an $8.8 million increase in accounts payable (excluding payables related to property and equipment) due primarily to the timing of payments and a $3.8 million decrease in accounts receivable due to the timing of cash receipts. These sources of cash were partially offset by a $6.3 million increase in inventories in order to support future demand, a $6.3 million decrease in taxes payable and accrued liabilities, primarily due to the timing of payroll related liabilities and a $4.0 million increase in prepaid expenses and other assets, primarily driven by prepaid taxes, advances to suppliers and interest receivable on marketable securities.

Cash From Investing Activities

Our investing activities provided $30.5 million of cash in the three months ended March 31, 2021, primarily consisting of $41.5 million from sales and maturities of marketable securities, net of purchases, offset by $11.1 million for purchases of property and equipment, primarily production-related machinery and equipment as well as construction of a new office building in Switzerland. Our investing activities in the three months ended March 31, 2020, resulted in an $12.5 million net use of cash, primarily consisting of $11.6 million for purchases of property and equipment, primarily production-related machinery and equipment, and $0.9 million for purchases of marketable securities, net of sales and maturities.

Cash From Financing Activities

Our financing activities in the three months ended March 31, 2021, resulted in an $4.2 million net use of cash, consisting of $7.8 million for the payment of dividends to stockholders, partially offset by $3.7 million from the issuance of common stock, including the exercise of employee stock options and the issuance of shares through our employee stock

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purchase plan. Our financing activities in the three months ended March 31, 2020, resulted in a $2.1 million net use of cash, consisting of $5.6 million for the payment of dividends to stockholders and $2.0 million for the repurchase of our common stock. These uses of cash were offset in part by $5.5 million from the issuance of common stock, including the exercise of employee stock options and the issuance of shares through our employee stock purchase plan.

Dividends

In October 2019, our board of directors declared four quarterly cash dividends of $0.095 per share to be paid to stockholders of record at the end of each quarter in 2020. In April 2020, our board of directors raised the cash dividend with the declaration of three cash dividends of $0.105 per share (in lieu of the $0.095 per share previously announced) to be paid to stockholders of record at the end of each of the second, third and fourth quarters in 2020. In July 2020, our board of directors raised the cash dividends further with the declaration of two cash dividends of $0.11 per share (in lieu of the $0.105 per share announced in April 2020) to be paid to stockholders of record at the end of each of the third and fourth quarter in 2020. In January 2021, our board of directors raised the quarterly cash dividend by an additional $0.02 per share with the declaration of four cash dividends of $0.13 per share to be paid to stockholders of record at the end of each quarter in 2021. A dividends payout of $7.8 million occurred on March 31, 2021. The declaration of any future cash dividend is at the discretion of the 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.

Stock Repurchases

We did not repurchase any of our common stock during the three months ended March 31, 2021. As of March 31, 2021, we had approximately $41.3 million remaining under our stock-repurchase program, which has no expiration date. In April 2021, our board of directors authorized the use of an additional $50.0 million for the repurchase of our common stock, with repurchases to be executed according to pre-defined price/volume guidelines. Authorization of future repurchase programs is at the discretion of the board of directors and will depend on our financial condition, results of operations, capital requirements, business conditions and other factors.

Contractual Commitments

As of March 31, 2021, we had a contractual obligation related to income tax, which consisted primarily of unrecognized tax benefits of approximately $19.9 million. A portion of the tax obligation is classified as long-term income taxes payable and a portion is recorded in deferred tax assets in our condensed consolidated balance sheet.

As of March 31, 2021, there were no material changes in our contractual commitments from those reported in our Annual Report on Form 10-K for the year ended December 31, 2020.

Other Information

Our cash, cash equivalents and investment balances may change in future periods due to changes in our planned cash outlays, including changes in incremental costs such as direct and integration costs related to future acquisitions. Current U.S. tax laws generally allow companies to repatriate accumulated foreign earnings without incurring additional U.S. federal taxes. Accordingly, as of March 31, 2021, our worldwide cash and marketable securities are available to fund capital allocation needs, including capital and internal investments, acquisitions, stock repurchases and/or dividends without incurring additional U.S. federal income taxes.

If our operating results deteriorate in future periods, either as a result of a decrease in customer demand or pricing pressures from our customers or our competitors, or for other reasons, our ability to generate positive cash flow from operations may be jeopardized. In that case, we may be forced to use our cash, cash equivalents and short-term investments, use our current financing or seek additional financing from third parties to fund our operations. We believe that cash generated from operations, together with existing sources of liquidity, will satisfy our projected working capital and other cash requirements for at least the next 12 months.

Off-Balance-Sheet Arrangements

As of March 31, 2021, we did not have any off-balance-sheet arrangements or relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which are typically established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

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Recent Accounting Pronouncements

Information with respect to this item may be found in Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, in our Notes to Unaudited Condensed Consolidated Financial Statements included in Part I, Item 1, of this Quarterly Report on Form 10-Q, which information is incorporated herein by reference.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There has not been a material change in our exposure to foreign currency exchange and interest rate risks from that described in our Annual Report on Form 10-K for the year ended December 31, 2020.

Interest Rate Risk. Our exposure to market risk for changes in interest rates relates primarily to our investment portfolio. We consider cash invested in highly liquid financial instruments with a remaining maturity of three months or less at the date of purchase to be cash equivalents. Investments in highly liquid financial instruments with maturities greater than three months at the date of purchase are classified as short-term investments. We generally hold securities until maturity; however, they may be sold under certain circumstances, including, but not limited to, when necessary for the funding of acquisitions and other strategic investments, and therefore we classify our investment portfolio as available-for-sale. We invest in high-credit quality issuers and, by policy, limit the amount of credit exposure to any one issuer. As stated in our policy, we seek to ensure the safety and preservation of our invested principal funds by limiting default risk, market risk and reinvestment risk. We mitigate default risk by investing in safe and high-credit quality securities and by constantly positioning our portfolio to respond appropriately to a significant reduction in a credit rating of any investment issuer, guarantor or depository. Our portfolio includes only marketable securities with active secondary or resale markets to facilitate portfolio liquidity. At March 31, 2021, and December 31, 2020, we held primarily cash equivalents and short-term investments with fixed interest rates.

Our investment securities are subject to market interest rate risk and will vary in value as market interest rates fluctuate. We monitor our investments per our above-mentioned investment policy; therefore, if market interest rates were to increase or decrease by 10% from interest rates as of March 31, 2021, or December 31, 2020, the increase or decrease in the fair market value of our portfolio on these dates would not have been material. We monitor our investments for impairment on a periodic basis. Refer to Note 5, Marketable Securities, in our Notes to Unaudited Condensed Consolidated Financial Statements, for a tabular presentation of our available-for-sale investments and the expected maturity dates.

Foreign Currency Exchange Risk. As of March 31, 2021, our primary transactional currency was U.S. dollars; in addition, we hold cash in Swiss francs and euro. We maintain cash denominated in Swiss francs and euro to fund the operations of our Swiss subsidiary. The foreign exchange rate fluctuation between the U.S. dollar versus the Swiss franc and euro is recorded in other income in our condensed consolidated statements of income.

We have sales offices in various other foreign countries in which our expenses are denominated in the local currency, primary Asia and Western Europe. Cash balances held in foreign countries are subject to local banking laws and may bear higher or lower risk than cash deposited in the United States. From time to time we may enter into foreign currency hedging contracts to hedge certain foreign currency transactions. As of March 31, 2021, and December 31, 2020, we did not have an open foreign currency hedge program utilizing foreign currency forward exchange contracts.

Two of our major suppliers, Epson and Lapis, have wafer supply agreements based in U.S. dollars; however, our agreements with Epson and Lapis also allow for mutual sharing of the impact of the exchange rate fluctuation between Japanese yen and the U.S. dollar on future purchases. Each year, our management and these two suppliers review and negotiate future pricing; the negotiated pricing is denominated in U.S. dollars but is subject to contractual exchange rate provisions. The fluctuation in the exchange rate is shared equally between us and each of these suppliers on future purchases. Nevertheless, as a result of these supplier agreements, our gross margin is influenced by fluctuations in the exchange rate between the U.S. dollar and the Japanese yen. All else being equal, a 10% change in the value of the U.S. dollar compared to the Japanese yen would result in a corresponding change in our gross margin of approximately 1.0%; this sensitivity may increase or decrease depending on the percentage of our wafer supply that we purchase from some of our Japanese suppliers and could subject our gross profit and operating results to the potential for material fluctuations.

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ITEM 4. CONTROLS AND PROCEDURES

Limitation on Effectiveness of Controls

Any control system, no matter how well designed and operated, can provide only reasonable assurance as to the tested objectives. The design of any control system is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions, regardless of how remote. The inherent limitations in any control system include the realities that judgments related to decision-making can be faulty, and that reduced effectiveness in controls can occur because of simple errors or mistakes. Due to the inherent limitations in a cost-effective control system, misstatements due to error may occur and may not be detected.

Evaluation of Disclosure Controls and Procedures

Management is required to evaluate our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the “Exchange Act”). Disclosure controls and procedures are controls and other procedures designed to provide reasonable assurance that information required to be disclosed in our reports filed under the Exchange Act, such as this Quarterly Report on Form 10-Q, is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and procedures include controls and procedures designed to provide reasonable assurance 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. Based on our management’s evaluation (with the participation of our principal executive officer and principal financial officer), our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) were effective as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the quarter ended March 31, 2021, that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Information with respect to this item may be found in Note 12, Legal Proceedings and Contingencies, in our Notes to Unaudited Condensed Consolidated Financial Statements included in Part I, Item 1, of this Quarterly Report on Form 10-Q, which information is incorporated herein by reference.

ITEM 1A. RISK FACTORS

As of the date of this filing, the risk factors have not changed substantively from those disclosed in Part I Item 1A in our Annual Report on Form 10-K for the year ended December 31, 2020, which risk factors are incorporated by reference in this report.

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ITEM 6. EXHIBITS

		Incorporation by Reference
EXHIBIT NUMBER	Exhibit Description	Form	File Number	Exhibit/Other Reference	Filing Date	Filed Herewith
3.1	Restated Certificate of Incorporation	10-K	000-23441	3.1	2/29/2012
3.2	Amended and Restated Bylaws	8-K	000-23441	3.1	4/26/2013
4.2	Reference is made to Exhibits 3.1 to 3.2
10.1	2021 Compensation Arrangements with Named Executive Officers	10-K	000-23441	Item 9B	2/5/2021
10.2†	Amendment Number Twelve to the Amended and Restated Wafer Supply Agreement, between Power Integrations International, Ltd. and Lapis Semiconductor Co., Ltd. (formerly OKI Semiconductor Co., Ltd.), effective as of September 17, 2020					X
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X
32.1**	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					X
32.2**	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					X
101.INS	XBRL Instance Document - The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.					X
101.SCH	Inline XBRL Taxonomy Extension Schema Document					X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document					X

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101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document	X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document	X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document	X
104	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)

All references in the table above to previously filed documents or descriptions are incorporating those documents and descriptions by reference thereto.

† Portions of this exhibit (indicated by asterisks) have been omitted as being immaterial and is the type of information that Power Integrations, Inc. treats as private or confidential.

** The certifications attached as Exhibits 32.1 and 32.2 accompanying this Form 10-Q, are not deemed filed with the SEC, and are not to be incorporated by reference into any filing of Power Integrations, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Form 10-Q, irrespective of any general incorporation language contained in such filing.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		POWER INTEGRATIONS, INC.
Dated:	April 29, 2021	By:	/s/ SANDEEP NAYYAR
			Sandeep Nayyar
			Chief Financial Officer
			(Duly Authorized Officer, Principal Financial Officer and Principal Accounting Officer)

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EX-10.2

Exhibit 10.2

[ ] = Certain confidential information contained in this document, marked by brackets, is omitted because it is both (i) not material and (ii) is the type of information that Power Integrations, Inc. treats as private or confidential.

AMENDMENT NUMBER TWELVE TO AMENDED AND RESTATED

WAFER SUPPLY AGREEMENT

This Amendment Number Twelve (the "Amendment"), is effective as of September 17, 2020 (the "Amendment Effective Date"), and amends the Amended and Restated Wafer Supply Agreement  that is effective as of April 1, 2003, as further amended by Amendment Number One that is effective as of August 11, 2004, Amendment Number Two, that is effective as of April 1, 2008, Amendment Number Three, that is effective as of June 9, 2008, Amendment Number Four, that is effective as of June 13, 2008, Amendment Number Five that is effective as of November 14, 2008, Amendment Number Six that is effective as of November 1, 2015, Amendment Number Seven that is effective as of August 8, 2016, Amendment Number Eight that is effective as of July 26, 2017, Amendment Number Nine that is effective as of February 6, 2019, amendment Number 10 that is effective as of December 16, 2019, and Amendment Number 11 that is effective as of December 20, 2019 (the "Agreement"), by and between Lapis Semiconductor Co., Ltd., a Japanese corporation having its registered head office at 2-4-8 Shinyokohama, Kouhoku-ku Yokohama 222-8575 Japan (“Lapis”), and Power Integrations, Ltd. d.b.a. Power Integrations International, Ltd. ("PI") a Cayman Islands corporation having its principal place of business at 4th Floor, Century Yard, Cricket Square, Elgin Avenue, P.O. Box 32322, Grand Cayman K Y 1-1209. Unless specifically designated otherwise, capitalized terms used herein shall have the same meanings given them in the Agreement.

RECITALS

WHEREAS, PI and LAPIS desire to amend the terms of the Agreement; and

WHEREAS, in accordance with Section 18. 10 of the Agreement, the Agreement may be amended only by an instrument in writing duly executed by authorized officers of LAPIS and PI.

Now, THEREFORE, in consideration of the mutual promises contained herein and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereby amend the Agreement as follows:

AGREEMENT

1. In ARTICLE 24:

In Section 24.4.1:

delete:

“The base price for an additional [*] to [*] [*] wafers per month manufactured in [*] will be priced at the base price of the [*] wafers manufactured in Lapis [*], plus [*].

and replace:

Starting [*], Lapis will reduce the base price for [*] wafers manufactured at the Lapis [*] plant to [*] such that the total value [*] of the above [*] [*] [*] price [*] the total value of the [*] [*] wafer price [*] during [*] and thereafter.  

with:

Starting [*], Lapis will [*] wafers manufactured at the Lapis [*].

and delete:

“At the end of each calendar quarter beginning at the end of [*], PI and Lapis will exchange [*] or [*], as the case may be, to account for any mismatch of the total value [*] of the [*] [*] [*] and the Lapis [*] wafer [*], for each such calendar quarter.”

2. Section 24.5.3 is added

24.5.3

[*] will be transferred only to [*].

The expected completion date of the [*] is [*].

Upon completion of the [*], Lapis has satisfied all obligations to PI under the [*].

2

IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their duly authorized representatives, effective as of the Amendment Effective Date.

LAPIS SEM/ICONDUCTOR CO., LTD.	POWER INTEGRATIONS, LTD. d.b.a. POWER INTEGRATIONS INTERNATIONAL, LTD.
Signature: /K. Ooiwa/ Name: Koichi Ooiwa Title: Group General Manager	Signature: /S. Gupta/ Name: Sunil Gupta Title: President and Director

3

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Balu Balakrishnan certify that:

1.I have reviewed this Form 10-Q of Power Integrations, 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 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 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.

Dated:	April 29, 2021	By:	/s/ BALU BALAKRISHNAN
			Balu BalakrishnanChief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Sandeep Nayyar, certify that:

1.I have reviewed this Form 10-Q of Power Integrations, 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 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 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.

Dated:	April 29, 2021	By:	/s/ SANDEEP NAYYAR
			Sandeep NayyarChief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

CERTIFICATION 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 Quarterly Report of Power Integrations, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Balu Balakrishnan, Chief Executive Officer of the Company, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (“Section 906”), certify to the best of my knowledge that:

(1)The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	April 29, 2021	By:	/s/ BALU BALAKRISHNAN
			Balu BalakrishnanChief Executive Officer

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

CERTIFICATION 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 Quarterly Report of Power Integrations, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Sandeep Nayyar, Chief Financial Officer of the Company, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (“Section 906”), certify to the best of my knowledge that:

(1)The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	April 29, 2021	By:	/s/ SANDEEP NAYYAR
			Sandeep NayyarChief Financial Officer

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.

XML

DOCUMENT AND ENTITY INFORMATION Document - $ / shares	3 Months Ended
	Mar. 31, 2021	Apr. 26, 2021
Document Information [Abstract]
Title of 12(b) Security	Common Stock
Entity Address, Address Line One	5245 Hellyer Avenue
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Incorporation, State or Country Code	DE
Document Type	10-Q
Document Quarterly Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-23441
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Listing, Par Value Per Share	$ 0.001
Entity Registrant Name	POWER INTEGRATIONS, INC.
Trading Symbol	POWI
Entity Central Index Key	0000833640
Entity Filer Category	Large Accelerated Filer
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		60,655,187
Entity Tax Identification Number	94-3065014
Entity Address, Postal Zip Code	95138
Security Exchange Name	NASDAQ
City Area Code	408
Local Phone Number	414-9200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 343,272	$ 258,874
Short-term marketable securities	148,067	190,318
Accounts receivable, net	42,257	35,910
Inventories	90,509	102,878
Prepaid expenses and other current assets	18,207	13,252
Total current assets	642,312	601,232
PROPERTY AND EQUIPMENT, net	168,712	166,188
INTANGIBLE ASSETS, net	11,474	12,506
GOODWILL	91,849	91,849
DEFERRED TAX ASSETS	1,892	3,339
OTHER ASSETS	28,480	28,225
Total assets	944,719	903,339
CURRENT LIABILITIES:
Accounts payable	38,172	34,712
Accrued payroll and related expenses	13,339	14,806
Taxes payable	856	902
Other accrued liabilities	10,160	12,106
Total current liabilities	62,527	62,526
LONG-TERM INCOME TAXES PAYABLE	14,033	15,588
OTHER LIABILITIES	14,336	14,814
Total liabilities	90,896	92,928
COMMITMENTS AND CONTINGENCIES (Notes 11, 12 and 13)
STOCKHOLDERS' EQUITY:
Common stock	29	28
Additional paid-in capital	203,051	190,920
Accumulated other comprehensive loss	(2,836)	(2,163)
Retained earnings	653,579	621,626
Total stockholders' equity	853,823	810,411
Total liabilities and stockholders' equity	$ 944,719	$ 903,339

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
NET REVENUES	$ 173,737	$ 109,664
COST OF REVENUES	89,326	53,184
GROSS PROFIT	84,411	56,480
OPERATING EXPENSES:
Research and development	20,027	19,152
Sales and marketing	14,123	13,473
General and administrative	10,075	8,761
Total operating expenses	44,225	41,386
INCOME FROM OPERATIONS	40,186	15,094
OTHER INCOME	597	1,777
INCOME BEFORE INCOME TAXES	40,783	16,871
PROVISION FOR INCOME TAXES	985	985
NET INCOME	$ 39,798	$ 15,886
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.66	$ 0.27
Diluted (in dollars per share)	$ 0.65	$ 0.26
SHARES USED IN PER SHARE CALCULATION:
Basic (in shares)	60,184	59,204
Diluted (in shares)	61,451	60,268

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical)	Aug. 18, 2020
Income Statement [Abstract]
Stock split ratio	2

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 39,798	$ 15,886
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of $0 tax in each of the three months ended March 31, 2021 and 2020	(18)	(283)
Unrealized loss on marketable securities, net of $0 tax in each of the three months ended March 31, 2021 and 2020	(580)	(952)
Amortization of defined benefit pension items, net of tax of $135 and $31 in the three months ended March 31, 2021, and 2020, respectively	(75)	51
Total other comprehensive loss	(673)	(1,184)
TOTAL COMPREHENSIVE INCOME	$ 39,125	$ 14,702

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0
Unrealized loss on marketable securities, tax	0	0
Amortization of defined benefit pension items, tax	$ 135	$ 31

XML

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total
Beginning balance at Dec. 31, 2019	$ 28	$ 152,117	$ (3,130)	$ 575,531
Common stock issued under employee stock plans	0	5,529
Repurchase of common stock	0	(2,013)
Stock-based compensation		6,710
Other comprehensive loss			(1,184)		$ (1,184)
Net income				15,886	15,886
Payment of dividends to stockholders				(5,644)
Ending balance at Mar. 31, 2020	28	162,343	(4,314)	585,773	743,830
Beginning balance at Dec. 31, 2020	28	190,920	(2,163)	621,626	810,411
Common stock issued under employee stock plans	1	3,651
Repurchase of common stock	0	0
Stock-based compensation		8,480
Other comprehensive loss			(673)		(673)
Net income				39,798	39,798
Payment of dividends to stockholders				(7,845)
Ending balance at Mar. 31, 2021	$ 29	$ 203,051	$ (2,836)	$ 653,579	$ 853,823

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 39,798	$ 15,886
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,453	5,488
Amortization of intangibles	1,032	1,117
Loss on disposal of property and equipment	17	30
Stock-based compensation expense	8,480	6,710
Amortization of premium on marketable securities	176	154
Deferred income taxes	1,445	1,095
Decrease in accounts receivable allowance for credit losses	(2)	(154)
Change in operating assets and liabilities:
Accounts receivable	(6,345)	3,831
Inventories	12,369	(6,253)
Prepaid expenses and other assets	(3,253)	(3,992)
Accounts payable	3,281	8,828
Taxes payable and accrued liabilities	(6,329)	(6,349)
Net cash provided by operating activities	58,122	26,391
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(11,051)	(11,603)
Proceeds from sale of property and equipment	25	0
Purchases of marketable securities	(21,971)	(16,838)
Proceeds from sales and maturities of marketable securities	63,466	15,947
Net cash provided by (used in) investing activities	30,469	(12,494)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	3,652	5,529
Repurchase of common stock	0	(2,013)
Payments of dividends to stockholders	(7,845)	(5,644)
Net cash used in financing activities	(4,193)	(2,128)
NET INCREASE IN CASH AND CASH EQUIVALENTS	84,398	11,769
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	258,874	178,690
CASH AND CASH EQUIVALENTS AT END OF PERIOD	343,272	190,459
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	6,116	5,250
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	$ 1,512	$ 305

XML

BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

1. BASIS OF PRESENTATION:

The condensed consolidated financial statements include the accounts of Power Integrations, Inc., a Delaware corporation (the “Company”), and its wholly owned subsidiaries. Significant intercompany accounts and transactions have been eliminated in consolidation.

While the financial information furnished is unaudited, the condensed consolidated financial statements included in this report reflect all adjustments (consisting only of normal recurring adjustments) that the Company considers necessary for the fair presentation of the results of operations for the interim periods covered and the financial condition of the Company at the date of the interim balance sheet in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The results for interim periods are not necessarily indicative of the results for the entire year. The condensed consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements and the notes thereto for the year ended December 31, 2020, included in its Form 10-K filed on February 5, 2021, with the Securities and Exchange Commission.

The share and per share information for all periods presented in this Form 10-Q reflects the effect of the August 2020 two-for-one stock split. Refer to Note 8, Stockholders’ Equity, in this Form 10-Q for details.

Certain prior year amounts have been reclassified for consistency with the current year presentation. These reclassifications had no effect on the reported results of operations.

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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

3 Months Ended

Mar. 31, 2021

Accounting Policies And Recent Accounting Pronouncements [Abstract]

SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

2. SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS:

Significant Accounting Policies and Estimates

No material changes have been made to the Company’s significant accounting policies disclosed in Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, in its Annual Report on Form 10-K, filed on February 5, 2021, for the year ended December 31, 2020.

Recent Accounting Pronouncements

The Company has considered all recent accounting pronouncements issued, but not yet effective, and does not expect any to have a material effect on the Company’s condensed consolidated financial statements.

XML

COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS

3. COMPONENTS OF THE COMPANY’S CONDENSED CONSOLIDATED BALANCE SHEETS:

Accounts Receivable

	March 31,		December 31,
(In thousands)	2021		2020
Accounts receivable trade	$	73,382	$	66,703
Allowance for ship and debit		(25,814)		(26,435)
Allowance for stock rotation and rebate		(4,886)		(3,931)
Allowance for credit losses		(425)		(427)
Total	$	42,257	$	35,910

The Company maintains an allowance for estimated credit losses resulting from the inability of customers to make required payments. This allowance is established using estimates formulated by the Company’s management based upon factors such as the composition of the accounts receivable aging, historical losses, changes in payments patterns, customer creditworthiness, and current economic trends. Receivables determined to be uncollectible are written off and deducted from the allowance.

	Allowance for Credit Losses
	Three Months Ended
	March 31,
(In thousands)	2021		2020
Beginning balance	$	(427)	$	(763)
Provision for credit loss expense		(217)		—
Receivables written off		—		154
Recoveries collected		219		—
Ending balance	$	(425)	$	(609)

Inventories

	March 31,		December 31,
(In thousands)	2021		2020
Raw materials	$	27,042	$	32,131
Work-in-process		37,319		39,469
Finished goods		26,148		31,278
Total	$	90,509	$	102,878

Intangible Assets

	March 31, 2021						December 31, 2020
			Accumulated						Accumulated
(In thousands)	Gross		Amortization		Net		Gross		Amortization		Net
Domain name	$	1,261	$	—	$	1,261	$	1,261	$	—	$	1,261
Developed technology		37,960		(29,882)		8,078		37,960		(29,126)		8,834
Customer relationships		16,700		(15,901)		799		16,700		(15,687)		1,013
Technology licenses		1,926		(590)		1,336		1,926		(528)		1,398
Total intangible assets	$	57,847	$	(46,373)	$	11,474	$	57,847	$	(45,341)	$	12,506

The estimated future amortization expense related to finite-lived intangible assets at March 31, 2021, is as follows:

	Estimated
	Amortization
Fiscal Year	(In thousands)
2021 (remaining nine months)	$	2,462
2022		2,415
2023		2,173
2024		1,279
2025		832
Thereafter		1,052
Total	$	10,213

Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for three months ended March 31, 2021 and 2020, were as follows:

	Unrealized Gains
	and Losses on				Defined Benefit						Foreign Currency
	Marketable Securities				Pension Items						Items				Total
	Three Months Ended				Three Months Ended						Three Months Ended				Three Months Ended
	March 31,				March 31,						March 31,				March 31,
(In thousands)	2021		2020		2021			2020			2021		2020		2021		2020
Beginning balance	$	890	$	583	$	(1,641)		$	(2,484)		$	(1,412)	$	(1,229)	$	(2,163)	$	(3,130)
Other comprehensive income (loss) before reclassifications		(580)		(952)		—			—			(18)		(283)		(598)		(1,235)
Amounts reclassified from accumulated other comprehensive loss		—		—		(75)	(1)		51	(1)		—		—		(75)		51
Net-current period other comprehensive income (loss)		(580)		(952)		(75)			51			(18)		(283)		(673)		(1,184)
Ending balance	$	310	$	(369)	$	(1,716)		$	(2,433)		$	(1,430)	$	(1,512)	$	(2,836)	$	(4,314)

(1) This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost for the three months ended March 31, 2021 and 2020.

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

4. FAIR VALUE MEASUREMENTS:

The FASB established a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices for identical assets in active markets; (Level 2) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value.

The Company’s cash equivalents and short-term marketable securities are classified within Level 1 or Level 2 of the fair-value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency.

The fair-value hierarchy of the Company’s cash equivalents and marketable securities at March 31, 2021, and December 31, 2020, was as follows:

	Fair Value Measurement at
	March 31, 2021
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	126,085	$	—	$	126,085
Commercial paper		297,727		—		297,727
Money market funds		13,170		13,170		—
Total	$	436,982	$	13,170	$	423,812

	Fair Value Measurement at
	December 31, 2020
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	146,658	$	—	$	146,658
Commercial paper		253,855		—		253,855
Money market funds		1,634		1,634		—
Total	$	402,147	$	1,634	$	400,513

The Company did not transfer any investments between Level 1 and Level 2 of the fair-value hierarchy in the three months ended March 31, 2021, and the twelve months ended December 31, 2020.

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MARKETABLE SECURITIES

3 Months Ended

Mar. 31, 2021

Marketable Securities [Abstract]

MARKETABLE SECURITIES

5. MARKETABLE SECURITIES:

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2021, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	1,999	$	—	$	—	$	1,999
Corporate securities		94,676		107		—		94,783
Total		96,675		107		—		96,782
Investments due in 4-12 months:
Commercial paper		19,983		—		—		19,983
Corporate securities		31,099		203		—		31,302
Total		51,082		203		—		51,285
Total marketable securities	$	147,757	$	310	$	—	$	148,067

Accrued interest receivable was $1.2 million at March 31, 2021 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet.

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2020, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	43,660	$	—	$	—	$	43,660
Corporate securities		19,846		44		—		19,890
Total		63,506		44		—		63,550
Investments due in 4-12 months:
Corporate securities		125,922		846		—		126,768
Total		125,922		846		—		126,768
Total marketable securities	$	189,428	$	890	$	—	$	190,318

Accrued interest receivable was $0.8 million at December 31, 2020 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet.

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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

6. STOCK-BASED COMPENSATION:

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2021, and March 31, 2020:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cost of revenues	$	631	$	396
Research and development		2,391		2,109
Sales and marketing		1,614		1,392
General and administrative		3,844		2,813
Total stock-based compensation expense	$	8,480	$	6,710

Stock-based compensation expense in the three months ended March 31, 2021, was approximately $8.5 million, comprising approximately $5.3 million related to restricted stock unit (RSU) awards, $2.7 million related to performance-based (PSU) awards and long-term performance-based (PRSU) awards and $0.5 million related to the Company’s employee stock purchase plan.

In the three months ended March 31, 2020, stock-based compensation expense was approximately $6.7 million, comprising approximately $5.0 million related to RSUs, $1.3 million related to PSUs and PRSUs and $0.4 million related to the Company’s employee stock purchase plan.

Stock Options

A summary of stock options outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
				Average
		Weighted-		Remaining
		Average		Contractual	Aggregate
	Shares	Exercise		Term	Intrinsic Value
	(In thousands)	Price		(In years)	(In thousands)
Outstanding at January 1, 2021	92	$	20.63
Granted	—		—
Exercised	(33)	$	19.15
Forfeited or expired	—		—
Outstanding at March 31, 2021	59	$	21.44	1.1	$	3,568
Vested and exercisable at March 31, 2021	59			1.1	$	3,568

PSU Awards

Under the performance-based awards program, the Company grants awards in the performance year in an amount equal to twice the target number of shares to be issued if the maximum performance metrics are met. The number of shares that are released at the end of the performance year can range from zero to 200% of the target number depending on the Company’s performance. The performance metrics of this program are annual targets consisting of a combination of net revenue, non-GAAP operating income and strategic goals.

As the net revenue, non-GAAP operating income and strategic goals are considered performance conditions, expense associated with these awards, net of estimated forfeitures, is recognized over the service period based on an assessment of the achievement of the performance targets. The fair value of these PSUs is determined using the fair value of the Company’s common stock on the date of the grant, reduced by the discounted present value of dividends expected to be declared before the awards vest. If the performance conditions are not achieved, no compensation cost is recognized and any previously recognized compensation is reversed.

In January 2021, it was determined that approximately 150,000 shares subject to the PSUs granted in 2020 vested in aggregate; the shares were released to the Company’s employees and executives in the first quarter of 2021.

A summary of PSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
	Shares	Grant Date Fair		Contractual Term	Intrinsic Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	150	$	46.27
Granted	57	$	84.05
Vested	(150)	$	46.27
Forfeited	—		—
Outstanding at March 31, 2021	57	$	84.05	0.75	$	4,682
Outstanding and expected to vest at March 31, 2021	57			0.75	$	4,682

PRSU Awards

The Company’s PRSU program provides for the issuance of PRSUs which will vest based on the Company’s performance measured against the PRSU program’s established performance targets. PRSUs are granted in an amount equal to twice the target number of shares to be issued if the maximum performance metrics are met. The actual number of shares the recipient receives is determined at the end of a three-year performance period based on results achieved versus the Company’s performance goals, and may range from zero to 200% of the target number. The performance goals for PRSUs granted in fiscal 2019 were based on the Company’s annual revenue growth, while the PRSUs granted in 2020 and 2021 were based on the Company’s compound annual growth rate (“CAGR”) of revenue as measured against the revenue CAGR of the analog semiconductor industry, in each case over the respective three-year performance period. Expense associated with these awards, net of estimated forfeitures, is recorded throughout the year based on an assessment of the expected achievement of the performance targets. If the performance conditions are not achieved, no compensation cost is recognized and any previously recognized compensation is reversed.

In January 2021 it was determined that approximately 6,000 shares subject to the PRSUs granted in 2018 vested in aggregate; the shares were released to the Company’s executives in the first quarter of 2021.

A summary of PRSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	301	$	41.90
Granted	97	$	83.01
Vested	(6)	$	29.95
Forfeited	(15)	$	40.05
Outstanding at March 31, 2021	377	$	52.75	1.65	$	30,737
Outstanding and expected to vest at March 31, 2021	377			1.65	$	30,737

RSU Awards

A summary of RSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	1,518	$	35.51
Granted	89	$	82.50
Vested	(209)	$	34.57
Forfeited	(39)	$	35.73
Outstanding at March 31, 2021	1,359	$	38.72	1.83	$	110,731
Outstanding and expected to vest at March 31, 2021	1,273			1.38	$	103,716

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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES

3 Months Ended

Mar. 31, 2021

Risks and Uncertainties [Abstract]

SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES

7. SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES:

Segment Reporting

The Company is organized and operates as one reportable segment, the design, development, manufacture and marketing of integrated circuits and related components for use primarily in the high-voltage power-conversion market. The Company’s chief operating decision maker, the Chief Executive Officer, reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance.

Customer Concentration

The Company’s top ten customers accounted for approximately 79% of net revenues for the three months ended March 31, 2021, and approximately 55% in the corresponding period of 2020. A significant portion of these revenues are attributable to sales of the Company’s products to distributors of electronic components. These distributors sell the Company’s products to a broad, diverse range of end users, including original equipment manufacturers, or OEMs, and merchant power supply manufacturers. Sales to distributors were $134.2 million in the three months ended March 31, 2021, and $83.5 million for the corresponding period of 2020. Direct sales to OEMs and power-supply manufacturers accounted for the remainder.

The following customers represented 10% or more of the Company’s net revenues for the respective periods:

	Three Months Ended
	March 31,
Customer	2021		2020
Avnet	31	%	11	%
Honestar Technologies Co., Ltd.	18	%	*
Powertech Distribution Ltd.	*		11	%

* Total customer revenue was less than 10% of net revenues.

No other customers accounted for 10% or more of the Company’s net revenues in the periods presented.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company does not have any off-balance-sheet credit exposure related to its customers. As of March 31, 2021, and December 31, 2020, 86% and 90%, respectively, of accounts receivable were concentrated with the Company’s top ten customers.

The following customers represented 10% or more of accounts receivable:

	March 31,		December 31,
Customer	2021		2020
Avnet	58	%	50	%
Powertech Distribution Ltd.	*		10	%

*   Total customer accounts receivable was less than 10% of accounts receivable.

No other customers accounted for 10% or more of the Company’s accounts receivable in the periods presented.

Geographic Net Revenues

The Company markets its products globally through its sales personnel and a worldwide network of independent sales representatives and distributors. Geographic net revenues, based on “bill to” customer locations, for the three months ended March 31, 2021, and March 31, 2020, were as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
United States of America	$	4,100	$	2,713
Hong Kong/China		118,730		60,413
Taiwan		6,442		6,479
Korea		12,489		10,357
Western Europe (excluding Germany)		7,130		10,035
Japan		4,647		3,905
Germany		7,006		5,567
Other		13,193		10,195
Total net revenues	$	173,737	$	109,664

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STOCKHOLDERS' EQUITY

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

STOCKHOLDERS' EQUITY

8. STOCKHOLDERS’ EQUITY:

Common Stock Shares Outstanding

	Three Months Ended
	March 31,
(In thousands)		2021	2020
Beginning balance		59,910	58,862
Common stock issued under employee stock plans		453	568
Repurchased		—	(48)
Ending balance		60,363	59,382

In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend, payable on August 18, 2020, to stockholders of record as of the close of business on August 14, 2020. The Company’s stockholders received one additional share of common stock for each share of common stock held on August 14, 2020. The share and per share information for all periods presented in this Form 10-Q reflects the effect of the stock split.

Common Stock Repurchases

The Company did not repurchase any common stock during the three months ended March 31, 2021. As of March 31, 2021, the Company had approximately $41.3 million remaining under its current repurchase program, which has no expiration date. In April 2021, the Company’s board of directors authorized the use of an additional $50.0 million for the repurchase of the Company’s common stock, with repurchases to be executed according to pre-defined price/volume guidelines. Authorization of future repurchase programs 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.

Cash Dividends

In October 2019, the Company’s board of directors declared four quarterly cash dividends of $0.095 per share to be paid to stockholders of record at the end of each quarter in 2020. In April 2020, the Company’s board of directors raised the cash dividends with the declaration of three cash dividends of $0.105 per share (in lieu of the $0.095 per share previously announced in October 2019) to be paid to stockholders of record at the end of each of the second, third and fourth quarter in 2020. In July 2020, the Company’s board of directors raised the cash dividends further with the declaration of two cash dividends of $0.11 per share (in lieu of the $0.105 per share announced in April 2020) to be paid to stockholders of record at the end of each of the third and fourth quarter in 2020.

In January 2021, the Company’s board of directors raised the quarterly cash dividend by an additional $0.02 per share with the declaration of four cash dividends of $0.13 per share to be paid to stockholders of record at the end of each quarter in 2021.

For the three months ended March 31, 2021, and 2020, cash dividends declared and paid were as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Dividends declared and paid	$	7,845	$	5,644
Dividends declared per common share	$	0.13	$	0.095

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EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

EARNINGS PER SHARE

9. EARNINGS PER SHARE:

Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under the stock purchase plan and contingently issuable performance-based awards, as computed using the treasury stock method.

A summary of the earnings per share calculation is as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Basic earnings per share:
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Basic earnings per share	$	0.66	$	0.27
Diluted earnings per share: (1)
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Effect of dilutive awards:
Employee stock plans		1,267		1,064
Diluted weighted-average common shares		61,451		60,268
Diluted earnings per share	$	0.65	$	0.26

(1) The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2021 and 2020 calculations as the shares were not contingently issuable as of the end of the reporting periods.

In the three months ended March 31, 2021 and 2020, no outstanding stock awards were determined to be anti-dilutive and therefore excluded from the computation of diluted earnings per share.

In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend to stockholders of record as of the close of business on August 14, 2020. Refer to Note 8, Stockholders’ Equity, for additional information. The share and per share information for all periods presented in this Form 10-Q reflects the effect of the stock split.

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PROVISION FOR INCOME TAXES

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

PROVISION FOR INCOME TAXES

10. PROVISION FOR INCOME TAXES:

Income-tax expense includes a provision for federal, state and foreign taxes based on the annual estimated effective tax rate applicable to the Company and its subsidiaries, adjusted for certain discrete items which are fully recognized in the period they occur. Accordingly, the interim effective tax rate may not be reflective of the annual estimated effective tax rate.

The Company’s effective tax rates for the three months ended March 31, 2021 and 2020, were 2.4% and 5.8%, respectively. In the three months ended March 31, 2021 and 2020, the effective tax rate was lower than the statutory federal income-tax rate of 21% due to the geographic distribution of the Company’s world-wide earnings in lower-tax jurisdictions, federal research tax credits and the recognition of excess tax benefits related to share-based payments. Additionally, in the three months ended March 31, 2021, the Company’s effective tax rate was favorably impacted by a discrete item associated with the release of an unrecognized tax benefit. These benefits were partially offset by foreign income subject to U.S. tax, known as global intangible low-taxed income. The Company’s primary jurisdiction where foreign earnings are derived is the Cayman Islands, which is a non-taxing jurisdiction. Income earned in other foreign jurisdictions was not material. The Company has not been granted any incentivized tax rates and does not operate under any tax holidays in any jurisdiction.

As of March 31, 2021, the Company maintained a valuation allowance on its California deferred tax assets, New Jersey deferred tax assets, and capital losses for federal purposes, and a valuation allowance with respect to its deferred tax assets relating to tax credits in Canada.

Determining the consolidated provision for income-tax expense, income-tax liabilities and deferred tax assets and liabilities involves judgment. The Company calculates and provides for income taxes in each of the tax jurisdictions in which it operates, which involves estimating current tax exposures as well as making judgments regarding the recoverability of deferred tax assets in each jurisdiction. The estimates used could differ from actual results, which may have a significant impact on operating results in future periods.

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COMMITMENTS

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS

11. COMMITMENTS:

Supplier Agreements

Under the terms of the Company’s wafer-supply agreements with Seiko Epson Corporation ("Epson"), and ROHM Lapis Semiconductor Co., Ltd. ("Lapis") the wafers purchased from these suppliers are priced in U.S. dollars, with mutual sharing of the impact of fluctuations in the exchange rate between the Japanese yen and the U.S. dollar on future purchases. Each year, the Company’s management and these two suppliers review and negotiate future pricing; the negotiated pricing is denominated in U.S. dollars but is subject to contractual exchange rate provisions. The fluctuation in the exchange rate is shared equally between the Company and each of these suppliers on future purchases.

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LEGAL PROCEEDINGS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

LEGAL PROCEEDINGS AND CONTINGENCIES

12. LEGAL PROCEEDINGS AND CONTINGENCIES:

From time to time in the ordinary course of business, the Company becomes involved in lawsuits, or customers and distributors may make claims against the Company. In accordance with ASC 450-10, Contingencies, the Company makes a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

On April 1, 2016, Opticurrent, LLC filed a complaint against the Company in the United States District Court for the Eastern District of Texas alleging that the Company infringed one patent pertaining to transistor switch devices and seeking damages for the alleged infringement. The Company filed a motion to transfer the case to the Northern District of California, which the Court granted, and the case was assigned to a new judge in San Francisco following the transfer. On December 21, 2018, the Court granted the Company’s challenge to Opticurrent’s damages expert but denied the Company’s motion for summary judgment. Following a trial in February 2019, a jury issued a finding of direct

infringement by the Company but found that the Company did not induce infringement, and awarded Opticurrent damages of $6.7 million. The Company challenged those findings in post-trial proceedings, and the Court granted one of the Company’s post-trial motions, reducing the damages award to $1.2 million. The Court of Appeals affirmed the original findings and the reduced damages award, but the Company believes Opticurrent made key disclaimers during reexamination proceedings after the original trial, giving rise to a motion to set aside the original judgment in view of a disclaimer, an issue that is currently on appeal to the Federal Circuit. Briefing on the Company’s appeal is expected to take place over the coming months, with oral argument and a ruling thereafter. The District Court has issued an order staying execution on the original judgment pending the Company’s appeal. As such, the Company continues to believe it has strong defenses, and intends to continue to vigorously defend itself against Opticurrent’s claims.

On June 19, 2019, Opticurrent, LLC filed a follow-on lawsuit in the United States District Court for the Northern District of California accusing more of the Company’s products of infringement and seeking damages for the alleged infringement of the same claim of the same patent asserted in the parties’ prior litigation, as described above. Limited discovery has taken place, but proceedings are currently stayed, and no schedule has yet been set for expert discovery, dispositive motions, or trial. The Company believes it has strong defenses, independent of the issue on appeal in the first case, and intends to vigorously defend itself against Opticurrent’s claims, with appeals to follow if necessary.

On January 6, 2020, the Company filed a complaint against CogniPower LLC in the United States District Court for the District of Delaware for infringement of two of the Company’s patents and seeking a declaration of non-infringement with respect to patents that CogniPower had charged the Company’s customers with infringing, based on customer use of the Company’s products. In response, CogniPower filed a motion to dismiss the Company’s declaratory judgment claims on the basis that CogniPower had not threatened the Company directly with suit. That motion was granted, so CogniPower’s claims for infringement initially went forward separately in their lawsuit against the Company’s customers in the District of Delaware, but the Company filed a motion to intervene in that lawsuit and received a ruling allowing the Company to intervene in CogniPower’s customer lawsuit on February 1, 2021. Fact discovery is now under way, but the Company believes it has strong claims and defenses, and intends to vigorously defend itself against CogniPower’s claims against the Company’s technology, with appeals to follow if necessary.

The Company is unable to predict the outcome of legal proceedings with certainty, and there can be no assurance that the Company will prevail in the above-mentioned unsettled litigations. These litigations, whether or not determined in the Company’s favor or settled, will be costly and will divert the efforts and attention of the Company’s management and technical personnel from normal business operations, potentially causing a material adverse effect on the business, financial condition and operating results. Currently, the Company is not able to estimate a loss or a range of loss for the ongoing litigation disclosed above, however adverse determinations in litigation could result in monetary losses, the loss of proprietary rights, subject the Company to significant liabilities, require the Company to seek licenses from third parties or prevent the Company from licensing the technology, any of which could have a material adverse effect on the Company’s business, financial condition and operating results.

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INDEMNIFICATIONS

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

INDEMNIFICATIONS

13. INDEMNIFICATIONS:

The Company sells products to its distributors under contracts, collectively referred to as Distributor Sales Agreements (“DSA”). Each DSA contains the relevant terms of the contractual arrangement with the distributor, and generally includes certain provisions for indemnifying the distributor against losses, expenses, and liabilities from damages that may be awarded against the distributor in the event the Company’s products are found to infringe upon a patent, copyright, trademark, or other proprietary right of a third party (“Customer Indemnification”). The DSA generally limits the scope of and remedies for the Customer Indemnification obligations in a variety of industry-standard respects, including, but not limited to, limitations based on time and geography, and a right to replace an infringing product. The Company also, from time to time, has granted a specific indemnification right to individual customers.

The Company believes its internal development processes and other policies and practices limit its exposure related to such indemnifications. In addition, the Company requires its employees to sign a proprietary information and inventions agreement, which assigns the rights to its employees’ development work to the Company. To date, the Company has not had to reimburse any of its distributors or customers for any losses related to these indemnifications and no material claims were outstanding as of March 31, 2021. For several reasons, including the lack of prior indemnification claims and the lack of a monetary liability limit for certain infringement cases, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnifications.

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SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Policies And Recent Accounting Pronouncements [Abstract]

Significant Accounting Policies and Estimates

Significant Accounting Policies and Estimates

No material changes have been made to the Company’s significant accounting policies disclosed in Note 2, Significant Accounting Policies and Recent Accounting Pronouncements, in its Annual Report on Form 10-K, filed on February 5, 2021, for the year ended December 31, 2020.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

The Company has considered all recent accounting pronouncements issued, but not yet effective, and does not expect any to have a material effect on the Company’s condensed consolidated financial statements.

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS (Tables)

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts Receivable

Accounts Receivable

	March 31,		December 31,
(In thousands)	2021		2020
Accounts receivable trade	$	73,382	$	66,703
Allowance for ship and debit		(25,814)		(26,435)
Allowance for stock rotation and rebate		(4,886)		(3,931)
Allowance for credit losses		(425)		(427)
Total	$	42,257	$	35,910

Schedule of Allowance for Credit Losses

	Allowance for Credit Losses
	Three Months Ended
	March 31,
(In thousands)	2021		2020
Beginning balance	$	(427)	$	(763)
Provision for credit loss expense		(217)		—
Receivables written off		—		154
Recoveries collected		219		—
Ending balance	$	(425)	$	(609)

Schedule of Inventory, Current

Inventories

	March 31,		December 31,
(In thousands)	2021		2020
Raw materials	$	27,042	$	32,131
Work-in-process		37,319		39,469
Finished goods		26,148		31,278
Total	$	90,509	$	102,878

Schedule Of Intangible Assets

Intangible Assets

	March 31, 2021						December 31, 2020
			Accumulated						Accumulated
(In thousands)	Gross		Amortization		Net		Gross		Amortization		Net
Domain name	$	1,261	$	—	$	1,261	$	1,261	$	—	$	1,261
Developed technology		37,960		(29,882)		8,078		37,960		(29,126)		8,834
Customer relationships		16,700		(15,901)		799		16,700		(15,687)		1,013
Technology licenses		1,926		(590)		1,336		1,926		(528)		1,398
Total intangible assets	$	57,847	$	(46,373)	$	11,474	$	57,847	$	(45,341)	$	12,506

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The estimated future amortization expense related to finite-lived intangible assets at March 31, 2021, is as follows:

	Estimated
	Amortization
Fiscal Year	(In thousands)
2021 (remaining nine months)	$	2,462
2022		2,415
2023		2,173
2024		1,279
2025		832
Thereafter		1,052
Total	$	10,213

Schedule of Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss for three months ended March 31, 2021 and 2020, were as follows:

	Unrealized Gains
	and Losses on				Defined Benefit						Foreign Currency
	Marketable Securities				Pension Items						Items				Total
	Three Months Ended				Three Months Ended						Three Months Ended				Three Months Ended
	March 31,				March 31,						March 31,				March 31,
(In thousands)	2021		2020		2021			2020			2021		2020		2021		2020
Beginning balance	$	890	$	583	$	(1,641)		$	(2,484)		$	(1,412)	$	(1,229)	$	(2,163)	$	(3,130)
Other comprehensive income (loss) before reclassifications		(580)		(952)		—			—			(18)		(283)		(598)		(1,235)
Amounts reclassified from accumulated other comprehensive loss		—		—		(75)	(1)		51	(1)		—		—		(75)		51
Net-current period other comprehensive income (loss)		(580)		(952)		(75)			51			(18)		(283)		(673)		(1,184)
Ending balance	$	310	$	(369)	$	(1,716)		$	(2,433)		$	(1,430)	$	(1,512)	$	(2,836)	$	(4,314)

(1) This component of accumulated other comprehensive income (loss) is included in the computation of net periodic pension cost for the three months ended March 31, 2021 and 2020.

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair value of marketable securities and investments

The fair-value hierarchy of the Company’s cash equivalents and marketable securities at March 31, 2021, and December 31, 2020, was as follows:

	Fair Value Measurement at
	March 31, 2021
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	126,085	$	—	$	126,085
Commercial paper		297,727		—		297,727
Money market funds		13,170		13,170		—
Total	$	436,982	$	13,170	$	423,812

	Fair Value Measurement at
	December 31, 2020
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	146,658	$	—	$	146,658
Commercial paper		253,855		—		253,855
Money market funds		1,634		1,634		—
Total	$	402,147	$	1,634	$	400,513

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MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2021

Marketable Securities [Abstract]

Available-for-sale Securities

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at March 31, 2021, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	1,999	$	—	$	—	$	1,999
Corporate securities		94,676		107		—		94,783
Total		96,675		107		—		96,782
Investments due in 4-12 months:
Commercial paper		19,983		—		—		19,983
Corporate securities		31,099		203		—		31,302
Total		51,082		203		—		51,285
Total marketable securities	$	147,757	$	310	$	—	$	148,067

Accrued interest receivable was $1.2 million at March 31, 2021 and was recorded within prepaid expenses and other current assets on the condensed consolidated balance sheet.

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2020, were as follows:

	Amortized		Gross Unrealized				Estimated Fair
(In thousands)	Cost		Gains		Losses		Market Value
Investments due in 3 months or less:
Commercial paper	$	43,660	$	—	$	—	$	43,660
Corporate securities		19,846		44		—		19,890
Total		63,506		44		—		63,550
Investments due in 4-12 months:
Corporate securities		125,922		846		—		126,768
Total		125,922		846		—		126,768
Total marketable securities	$	189,428	$	890	$	—	$	190,318

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based Compensation Expense

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2021, and March 31, 2020:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
Cost of revenues	$	631	$	396
Research and development		2,391		2,109
Sales and marketing		1,614		1,392
General and administrative		3,844		2,813
Total stock-based compensation expense	$	8,480	$	6,710

Summary of Option Activity Under the Plans

A summary of stock options outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
				Average
		Weighted-		Remaining
		Average		Contractual	Aggregate
	Shares	Exercise		Term	Intrinsic Value
	(In thousands)	Price		(In years)	(In thousands)
Outstanding at January 1, 2021	92	$	20.63
Granted	—		—
Exercised	(33)	$	19.15
Forfeited or expired	—		—
Outstanding at March 31, 2021	59	$	21.44	1.1	$	3,568
Vested and exercisable at March 31, 2021	59			1.1	$	3,568

Performance Based Awards (PSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
	Shares	Grant Date Fair		Contractual Term	Intrinsic Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	150	$	46.27
Granted	57	$	84.05
Vested	(150)	$	46.27
Forfeited	—		—
Outstanding at March 31, 2021	57	$	84.05	0.75	$	4,682
Outstanding and expected to vest at March 31, 2021	57			0.75	$	4,682

Long-term Performance Based Units (PRSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PRSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	301	$	41.90
Granted	97	$	83.01
Vested	(6)	$	29.95
Forfeited	(15)	$	40.05
Outstanding at March 31, 2021	377	$	52.75	1.65	$	30,737
Outstanding and expected to vest at March 31, 2021	377			1.65	$	30,737

Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of RSUs outstanding as of March 31, 2021, and activity during the three months then ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2021	1,518	$	35.51
Granted	89	$	82.50
Vested	(209)	$	34.57
Forfeited	(39)	$	35.73
Outstanding at March 31, 2021	1,359	$	38.72	1.83	$	110,731
Outstanding and expected to vest at March 31, 2021	1,273			1.38	$	103,716

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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Tables)

3 Months Ended

Mar. 31, 2021

Concentration Risk [Line Items]

Geographic Net Revenues

The Company markets its products globally through its sales personnel and a worldwide network of independent sales representatives and distributors. Geographic net revenues, based on “bill to” customer locations, for the three months ended March 31, 2021, and March 31, 2020, were as follows:

	Three Months Ended
	March 31,
(In thousands)	2021		2020
United States of America	$	4,100	$	2,713
Hong Kong/China		118,730		60,413
Taiwan		6,442		6,479
Korea		12,489		10,357
Western Europe (excluding Germany)		7,130		10,035
Japan		4,647		3,905
Germany		7,006		5,567
Other		13,193		10,195
Total net revenues	$	173,737	$	109,664

Revenue from Contract with Customer Benchmark [Member]

Concentration Risk [Line Items]

Schedules of Concentration of Risk, by Risk Factor

The following customers represented 10% or more of the Company’s net revenues for the respective periods:

	Three Months Ended
	March 31,
Customer	2021		2020
Avnet	31	%	11	%
Honestar Technologies Co., Ltd.	18	%	*
Powertech Distribution Ltd.	*		11	%

Accounts Receivable [Member]

Concentration Risk [Line Items]

Schedules of Concentration of Risk, by Risk Factor

The following customers represented 10% or more of accounts receivable:

	March 31,		December 31,
Customer	2021		2020
Avnet	58	%	50	%
Powertech Distribution Ltd.	*		10	%

*   Total customer accounts receivable was less than 10% of accounts receivable.

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STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of Common Stock Shares Outstanding

	Three Months Ended
	March 31,
(In thousands)		2021	2020
Beginning balance		59,910	58,862
Common stock issued under employee stock plans		453	568
Repurchased		—	(48)
Ending balance		60,363	59,382

Schedule of Dividends Declared and Paid

For the three months ended March 31, 2021, and 2020, cash dividends declared and paid were as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Dividends declared and paid	$	7,845	$	5,644
Dividends declared per common share	$	0.13	$	0.095

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EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings per share calculation

A summary of the earnings per share calculation is as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2021		2020
Basic earnings per share:
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Basic earnings per share	$	0.66	$	0.27
Diluted earnings per share: (1)
Net income	$	39,798	$	15,886
Weighted-average common shares		60,184		59,204
Effect of dilutive awards:
Employee stock plans		1,267		1,064
Diluted weighted-average common shares		61,451		60,268
Diluted earnings per share	$	0.65	$	0.26

(1) The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2021 and 2020 calculations as the shares were not contingently issuable as of the end of the reporting periods.

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BASIS OF PRESENTATION (Details)	Aug. 18, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock split ratio	2

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Accounts receivable trade	$ 73,382	$ 66,703
Allowance for ship and debit	(25,814)	(26,435)
Allowance for stock rotation and rebate	(4,886)	(3,931)
Allowance for credit losses	(425)	(427)	$ (609)	$ (763)
Total	$ 42,257	$ 35,910

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Beginning Balance	$ (427)	$ (763)
Provision for credit loss expense	(217)	0
Receivables written off	0	154
Recoveries collected	219	0
Ending Balance	$ (425)	$ (609)

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 27,042	$ 32,131
Work-in-process	37,319	39,469
Finished goods	26,148	31,278
Total	$ 90,509	$ 102,878

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Intangible Assets Table [Line Items]
Intangible Assets, Gross	$ 57,847	$ 57,847
Accumulated Amortization	(46,373)	(45,341)
Finite-Lived Intangible Assets, Net	10,213
Total Intangible Assets, Net	11,474	12,506
Developed technology
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	37,960	37,960
Accumulated Amortization	(29,882)	(29,126)
Finite-Lived Intangible Assets, Net	8,078	8,834
Customer relationships
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	16,700	16,700
Accumulated Amortization	(15,901)	(15,687)
Finite-Lived Intangible Assets, Net	799	1,013
Technology licenses
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	1,926	1,926
Accumulated Amortization	(590)	(528)
Finite-Lived Intangible Assets, Net	1,336	1,398
Domain name
Schedule of Intangible Assets Table [Line Items]
Indefinite-Lived Intangible Assets	1,261	1,261
Accumulated Amortization	$ 0	$ 0

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Future Amortization Expense (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021 (remaining nine months)	$ 2,462
2022	2,415
2023	2,173
2024	1,279
2025	832
Thereafter	1,052
Total	$ 10,213

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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (2,163)	$ (3,130)
Other comprehensive income (loss) before reclassifications	(598)	(1,235)
Amounts reclassified from accumulated other comprehensive loss	(75)	51
Net-current period other comprehensive income (loss)	(673)	(1,184)
Ending balance	(2,836)	(4,314)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	890	583
Other comprehensive income (loss) before reclassifications	(580)	(952)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	(580)	(952)
Ending balance	310	(369)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,641)	(2,484)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(75)	51
Net-current period other comprehensive income (loss)	(75)	51
Ending balance	(1,716)	(2,433)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,412)	(1,229)
Other comprehensive income (loss) before reclassifications	(18)	(283)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net-current period other comprehensive income (loss)	(18)	(283)
Ending balance	$ (1,430)	$ (1,512)

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FAIR VALUE MEASUREMENTS Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments at Fair Value	$ 436,982	$ 402,147
Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	126,085	146,658
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	297,727	253,855
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	13,170	1,634
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments at Fair Value	13,170	1,634
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	13,170	1,634
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments at Fair Value	423,812	400,513
Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	126,085	146,658
Significant Other Observable Inputs (Level 2) | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	297,727	253,855
Significant Other Observable Inputs (Level 2) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments at Fair Value	$ 0	$ 0

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MARKETABLE SECURITIES Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Interest receivable	$ 1,200	$ 800
Amortized Cost	147,757	189,428
Gross Unrealized Gains	310	890
Gross Unrealized Losses	0	0
Estimated Fair Market Value	148,067	190,318
Investments due in 3 months or less:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	96,675	63,506
Gross Unrealized Gains	107	44
Gross Unrealized Losses	0	0
Estimated Fair Market Value	96,782	63,550
Investments due in 4-12 months:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	51,082	125,922
Gross Unrealized Gains	203	846
Gross Unrealized Losses	0	0
Estimated Fair Market Value	51,285	126,768
Commercial paper | Investments due in 3 months or less:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,999	43,660
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Market Value	1,999	43,660
Commercial paper | Investments due in 4-12 months:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,983
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Market Value	19,983
Corporate securities | Investments due in 3 months or less:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	94,676	19,846
Gross Unrealized Gains	107	44
Gross Unrealized Losses	0	0
Estimated Fair Market Value	94,783	19,890
Corporate securities | Investments due in 4-12 months:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,099	125,922
Gross Unrealized Gains	203	846
Gross Unrealized Losses	0	0
Estimated Fair Market Value	$ 31,302	$ 126,768

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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 8,480	$ 6,710
Performance Based Awards and Long Term Performance Based Units
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	2,700	1,300
Restricted Stock Units (RSUs)
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	5,300	5,000
Employee Stock Purchase Plan
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	500	400
Cost of revenues
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	631	396
Research and development
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	2,391	2,109
Sales and marketing
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	1,614	1,392
General and administrative
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations:
Stock-based compensation expense	$ 3,844	$ 2,813

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STOCK-BASED COMPENSATION Option Activity (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Option activity under the Plans
Outstanding at January 1, 2021	92
Granted	0
Exercised	(33)
Forfeited or expired	0
Outstanding at March 31, 2021	59
Vested and exercisable at March 31, 2021	59
Weighted- Average Exercise Price (in dollars per share)
Outstanding at January 1, 2021 | $ / shares	$ 20.63
Granted | $ / shares	0
Exercised | $ / shares	19.15
Forfeited or expired | $ / shares	0
Outstanding at March 31, 2021 | $ / shares	$ 21.44
Weighted-Average Remaining Contractual Term (In years)
Outstanding at March 31, 2021	1 year 1 month 6 days
Vested and exercisable at March 31, 2021	1 year 1 month 6 days
Aggregate Intrinsic Value [Abstract]
Outstanding at March 31, 2021 | $	$ 3,568
Vested and exercisable at March 31, 2021 | $	$ 3,568

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STOCK-BASED COMPENSATION Performance-based Awards and Restricted Stock Units (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Restricted Stock Units (RSUs)
Shares
Outstanding at January 1, 2021	1,518,000
Granted	89,000
Vested	(209,000)
Forfeited	(39,000)
Outstanding at March 31, 2021	1,359,000
Outstanding and expected to vest at March 31, 2021	1,273,000
Weighted- Average Grant Date Fair Value Per Share (in dollars per share)
Outstanding at January 1, 2021 | $ / shares	$ 35.51
Granted | $ / shares	82.50
Vested | $ / shares	34.57
Forfeited | $ / shares	35.73
Outstanding at March 31, 2021 | $ / shares	$ 38.72
Weighted-Average Remaining Contractual Term (In years)
Outstanding at March 31, 2021	1 year 9 months 29 days
Outstanding and expected to vest at March 31, 2021	1 year 4 months 17 days
Aggregate Intrinsic Value (In thousands)
Outstanding at March 31, 2021 | $	$ 110,731
Outstanding and expected to vest at March 31, 2021 | $	$ 103,716
Long-term Performance Based Units (PRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based period	3 years
Shares
Outstanding at January 1, 2021	301,000
Granted	97,000
Vested	(6,000)
Forfeited	(15,000)
Outstanding at March 31, 2021	377,000
Outstanding and expected to vest at March 31, 2021	377,000
Weighted- Average Grant Date Fair Value Per Share (in dollars per share)
Outstanding at January 1, 2021 | $ / shares	$ 41.90
Granted | $ / shares	83.01
Vested | $ / shares	29.95
Forfeited | $ / shares	40.05
Outstanding at March 31, 2021 | $ / shares	$ 52.75
Weighted-Average Remaining Contractual Term (In years)
Outstanding at March 31, 2021	1 year 7 months 24 days
Outstanding and expected to vest at March 31, 2021	1 year 7 months 24 days
Aggregate Intrinsic Value (In thousands)
Outstanding at March 31, 2021 | $	$ 30,737
Outstanding and expected to vest at March 31, 2021 | $	$ 30,737
Performance Based Awards (PSUs)
Shares
Outstanding at January 1, 2021	150,000
Granted	57,000
Vested	(150,000)
Forfeited	0
Outstanding at March 31, 2021	57,000
Outstanding and expected to vest at March 31, 2021	57,000
Weighted- Average Grant Date Fair Value Per Share (in dollars per share)
Outstanding at January 1, 2021 | $ / shares	$ 46.27
Granted | $ / shares	84.05
Vested | $ / shares	46.27
Forfeited | $ / shares	0
Outstanding at March 31, 2021 | $ / shares	$ 84.05
Weighted-Average Remaining Contractual Term (In years)
Outstanding at March 31, 2021	9 months
Outstanding and expected to vest at March 31, 2021	9 months
Aggregate Intrinsic Value (In thousands)
Outstanding at March 31, 2021 | $	$ 4,682
Outstanding and expected to vest at March 31, 2021 | $	$ 4,682
Minimum [Member] | Long-term Performance Based Units (PRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Performance Based Awards Shares Released As Percentage Of Target Number	0.00%
Minimum [Member] | Performance Based Awards (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Performance Based Awards Shares Released As Percentage Of Target Number	0.00%
Maximum [Member] | Long-term Performance Based Units (PRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Performance Based Awards Shares Released As Percentage Of Target Number	200.00%
Maximum [Member] | Performance Based Awards (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Performance Based Awards Shares Released As Percentage Of Target Number	200.00%

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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Customer and Credit Risk Concentration (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) customer segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 customer
Concentration Risk [Line Items]
Number of reportable segments | segment	1
NET REVENUES | $	$ 173,737	$ 109,664
Distributors
Concentration Risk [Line Items]
NET REVENUES | $	$ 134,200	$ 83,500
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of major customers | customer	10
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Avnet
Concentration Risk [Line Items]
Concentration risk, percentage of total net revenues	31.00%	11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Honestar Technologies Co., Ltd.
Concentration Risk [Line Items]
Concentration risk percentage	18.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration risk percentage		11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Ten Customers
Concentration Risk [Line Items]
Concentration risk, percentage of total net revenues	79.00%	55.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of major customers | customer	10		10
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Avnet
Concentration Risk [Line Items]
Concentration risk percentage	58.00%		50.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration risk percentage			10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Ten Customers
Concentration Risk [Line Items]
Concentration risk percentage	86.00%		90.00%

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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue by Geography
Total net revenues	$ 173,737	$ 109,664
United States of America
Revenue by Geography
Total net revenues	4,100	2,713
Hong Kong/China
Revenue by Geography
Total net revenues	118,730	60,413
Taiwan
Revenue by Geography
Total net revenues	6,442	6,479
Korea
Revenue by Geography
Total net revenues	12,489	10,357
Western Europe (excluding Germany)
Revenue by Geography
Total net revenues	7,130	10,035
Japan
Revenue by Geography
Total net revenues	4,647	3,905
Germany
Revenue by Geography
Total net revenues	7,006	5,567
Other
Revenue by Geography
Total net revenues	$ 13,193	$ 10,195

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STOCKHOLDERS' EQUITY Common Stock Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Common Stock Shares Outstanding [Abstract]
Beginning balance	59,910	58,862
Common stock issued under employee stock plans	453	568
Repurchased	0	(48)
Ending balance	60,363	59,382

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STOCKHOLDERS' EQUITY Common Stock Repurchases (Details) - USD ($) $ in Millions	Apr. 27, 2021	Mar. 31, 2021
Stockholders' Equity [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 41.3
Subsequent Event
Stockholders' Equity [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 50.0

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STOCKHOLDERS' EQUITY Dividends (Details)		1 Months Ended				3 Months Ended
	Aug. 18, 2020	Jan. 31, 2021 item $ / shares	Jul. 31, 2020 USD ($) $ / shares	Apr. 30, 2020 USD ($) $ / shares	Oct. 31, 2019 USD ($) $ / shares	Mar. 31, 2021 USD ($) $ / shares	Mar. 31, 2020 USD ($) $ / shares
Dividends Declared and Paid [Line Items]
Stock split ratio	2
Dividends declared and paid | $						$ 7,845,000	$ 5,644,000
Dividends declared per common share						$ 0.13	$ 0.095
Common Stock, Dividends, Number of Quarterly Distributions Declared		4	2	3	4
Common Stock, Dividends, Per Share, Declared					$ 0.095		$ 0.095
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Second Quarter				$ 0.105
Common Stock, Dividends Per Share Declared, Prior Fiscal Year, Third Quarter			$ 0.11
Common Stock, Dividends Per Share Declared, Prior Fiscal Year, Fourth Quarter			$ 0.11
Common Stock, Dividends Per Share Declared, Prior Fiscal Year, Second Quarter				0.105
Common Stock, Dividends Per Share Declared, Current Fiscal Year		$ 0.02
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Third Quarter				0.105
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter				$ 0.105
Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, Each Quarter		$ 0.13
Common Stock
Dividends Declared and Paid [Line Items]
Stock split ratio	2
Dividends Payable, Date to be Paid			Aug. 18, 2020
Dividends Payable, Date of Record			Aug. 14, 2020

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EARNINGS PER SHARE (Details) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Aug. 18, 2020	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares
Basic earnings per share:
Net income | $		$ 39,798	$ 15,886
Weighted-average common shares		60,184	59,204
Basic earnings per share | $ / shares		$ 0.66	$ 0.27
Diluted earnings per share:
Net income | $		$ 39,798	$ 15,886
Weighted-average common shares		60,184	59,204
Effect of dilutive awards:
Employee stock plans		1,267	1,064
Diluted weighted-average common shares		61,451	60,268
Diluted earnings per share | $ / shares		$ 0.65	$ 0.26
Stock awards excluded in the computation of diluted earnings per share		0	0
Stock split ratio	2

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PROVISION FOR INCOME TAXES (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	2.40%	5.80%
Federal statutory tax rate	21.00%	21.00%

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LEGAL PROCEEDINGS AND CONTINGENCIES (Details) - Pending Litigation [Member] $ in Millions			1 Months Ended	6 Months Ended
	Jan. 06, 2020 patent	Apr. 01, 2016 patent	Feb. 28, 2019 USD ($)	Jun. 30, 2020 USD ($)
Patent Infringement Claim One
Gain and Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number		1
Loss Contingency, Damages Awarded, Value | $			$ 6.7	$ 1.2
Patent Infringement Claim Two
Gain and Loss Contingencies [Line Items]
Gain Contingency, Patents Allegedly Infringed upon, Number	2