10-Q

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☑	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Quarterly Period ended September 30, 2022

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 000-31311

PDF SOLUTIONS, INC.

(Exact name of Registrant as Specified in its Charter)

Delaware	25-1701361
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
2858 De La Cruz Blvd.
Santa Clara, California	95050
(Address of Principal Executive Offices)	(Zip Code)

(408) 280-7900

(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, $0.00015 par value	PDFS	The Nasdaq Stock Market LLC

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 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 has 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 ☑

There were 37,382,927 shares of the Registrant’s Common Stock outstanding as of November 4, 2022.

TABLE OF CONTENTS

	Page
PART I   FINANCIAL INFORMATION
Item 1. Financial Statements (Unaudited)
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Comprehensive Income (Loss)	4
Condensed Consolidated Statements of Stockholders’ Equity	5
Condensed Consolidated Statements of Cash Flows	7
Notes to Condensed Consolidated Financial Statements	9
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	26
Item 3. Quantitative and Qualitative Disclosures About Market Risk	39
Item 4. Controls and Procedures	40
PART II  OTHER INFORMATION
Item 1. Legal Proceedings	40
Item 1A. Risk Factors	40
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 3. Defaults Upon Senior Securities	42
Item 4. Mine Safety Disclosures	42
Item 5. Other Information	42
Item 6. Exhibits	43
INDEX TO EXHIBITS	43
SIGNATURES	44

2

PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(in thousands, except par value)

	September 30,		December 31,
	2022		2021
ASSETS
Current assets:
Cash and cash equivalents	$	93,728	$	27,684
Short-term investments		22,357		112,542
Accounts receivable, net of allowance for doubtful accounts of $890 as of September 30, 2022 and December 31, 2021		54,981		40,087
Prepaid expenses and other current assets		9,463		8,194
Total current assets		180,529		188,507
Property and equipment, net		38,740		35,295
Operating lease right-of-use assets, net		6,022		5,408
Goodwill		14,123		14,123
Intangible assets, net		18,934		21,239
Deferred tax assets, net		16		75
Other non-current assets		7,611		9,121
Total assets	$	265,975	$	273,768
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	5,186	$	5,554
Accrued compensation and related benefits		12,652		9,495
Accrued and other current liabilities		6,472		3,328
Operating lease liabilities – current portion		1,448		1,758
Deferred revenues – current portion		26,461		23,691
Billings in excess of recognized revenues		183		—
Total current liabilities		52,402		43,826
Long-term income taxes payable		2,348		2,656
Non-current portion of operating lease liabilities		6,074		5,258
Non-current portion of deferred revenues		1,948		2,443
Total liabilities		62,772		54,183
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding		—		—
Common stock, $0.00015 par value, 70,000 shares authorized; shares issued 48,448 and 47,414, respectively; shares outstanding 37,295 and 37,411, respectively		6		6
Additional paid-in-capital		441,705		423,069
Treasury stock at cost, 11,153 and 10,003 shares, respectively		(132,966)		(104,705)
Accumulated deficit		(101,633)		(97,721)
Accumulated other comprehensive loss		(3,909)		(1,064)
Total stockholders’ equity		203,203		219,585
Total liabilities and stockholders’ equity	$	265,975	$	273,768

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited)

3

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(unaudited)

(in thousands, except per share amounts)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Revenues:
Analytics	$	32,879	$	27,194	$	94,422	$	66,165
Integrated Yield Ramp		6,981		2,361		13,604		15,009
Total revenues		39,860		29,555		108,026		81,174
Costs and Expenses:
Costs of revenues		12,545		11,070		36,116		32,518
Research and development		14,303		10,657		41,766		32,562
Selling, general and administrative		12,005		9,609		32,614		28,482
Amortization of acquired intangible assets		318		314		946		942
Interest and other expense (income), net		(1,511)		(194)		(2,812)		(391)
Income (loss) before income taxes		2,200		(1,901)		(604)		(12,939)
Income tax expense		815		506		3,308		1,549
Net income (loss)	$	1,385	$	(2,407)	$	(3,912)	$	(14,488)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax		(1,394)		(226)		(2,828)		(540)
Change in unrealized gain (loss) related to available-for-sale debt securities, net of tax		17		1		(17)		(3)
Total other comprehensive loss		(1,377)		(225)		(2,845)		(543)
Comprehensive income (loss)	$	8	$	(2,632)	$	(6,757)	$	(15,031)
Net income (loss) per share:
Basic	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)
Diluted	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)
Weighted average common shares used to calculate net income (loss) per share:
Basic		37,226		37,221		37,285		37,067
Diluted		38,054		37,221		37,285		37,067

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited)

4

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(unaudited)

(in thousands)

	Three and Nine Months Ended September 30, 2022
											Accumulated
				Additional							Other		Total
	Common Stock			Paid-In		Treasury Stock			Accumulated		Comprehensive		Stockholders’
	Shares	Amount		Capital		Shares	Amount		Deficit		Loss		Equity
Balances, December 31, 2021	37,411	$	6	$	423,069	10,003	$	(104,705)	$	(97,721)	$	(1,064)	$	219,585
Issuance of common stock in connection with employee stock purchase plans	95		—		1,502	—		—		—		—		1,502
Issuance of common stock in connection with exercise of options	75		—		675	—		—		—		—		675
Vesting of restricted stock units	232		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	113		(3,389)		—		—		(3,389)
Repurchase of common stock	(219)		—		—	219		(5,778)		—		—		(5,778)
Stock-based compensation expense	—		—		5,553	—		—		—		—		5,553
Comprehensive loss	—		—		—	—		—		(4,150)		(431)		(4,581)
Balances, March 31, 2022	37,594	$	6	$	430,799	10,335	$	(113,872)	$	(101,871)	$	(1,495)	$	213,567
Issuance of common stock in connection with exercise of options	12		—		113	—		—		—		—		113
Vesting of restricted stock units	84		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	33		(800)		—		—		(800)
Repurchase of common stock	(715)		—		—	715		(16,693)		—		—		(16,693)
Stock-based compensation expense	—		—		3,872	—		—		—		—		3,872
Comprehensive loss	—		—		—	—		—		(1,147)		(1,037)		(2,184)
Balances, June 30, 2022	36,975	$	6	$	434,784	11,083	$	(131,365)	$	(103,018)	$	(2,532)	$	197,875
Issuance of common stock in connection with employee stock purchase plan	92		—		1,509	—		—		—		—		1,509
Issuance of common stock in connection with exercise of options	22		—		276	—		—		—		—		276
Vesting of restricted stock units	206		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	70		(1,601)		—		—		(1,601)
Stock-based compensation expense	—		—		5,136	—		—		—		—		5,136
Comprehensive income (loss)	—		—		—	—		—		1,385		(1,377)		8
Balances, September 30, 2022	37,295	$	6	$	441,705	11,153	$	(132,966)	$	(101,633)	$	(3,909)	$	203,203

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited)

5

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY – CONTINUED

(unaudited)

(in thousands)

	Three and Nine Months Ended September 30, 2021
											Accumulated
				Additional							Other		Total
	Common Stock			Paid-In		Treasury Stock			Accumulated		Comprehensive		Stockholders’
	Shares	Amount		Capital		Shares	Amount		Deficit		Loss		Equity
Balances, December 31, 2020	36,850	$	6	$	407,173	9,550	$	(96,215)	$	(76,233)	$	(225)	$	234,506
Issuance of common stock in connection with employee stock purchase plan	100		—		921	—		—		—		—		921
Issuance of common stock in connection with exercise of options	81		—		568	—		—		—		—		568
Vesting of restricted stock units	149		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	73		(1,463)		—		—		(1,463)
Repurchase of common stock	(251)		—		—	251		(4,523)		—		—		(4,523)
Stock-based compensation expense	—		—		3,369	—		—		—		—		3,369
Comprehensive loss	—		—		—	—		—		(7,597)		(528)		(8,125)
Balances, March 31, 2021	36,929	$	6	$	412,031	9,874	$	(102,201)	$	(83,830)	$	(753)	$	225,253
Issuance of common stock in connection with exercise of options	39		—		290	—		—		—		—		290
Vesting of restricted stock units	118		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	51		(887)		—		—		(887)
Stock-based compensation expense	—		—		2,742	—		—		—		—		2,742
Comprehensive income (loss)	—		—		—	—		—		(4,484)		210		(4,274)
Balances, June 30, 2021	37,086	$	6	$	415,063	9,925	$	(103,088)	$	(88,314)	$	(543)	$	223,124
Issuance of common stock in connection with employee stock purchase plan	9		—		114	—		—		—		—		114
Issuance of common stock in connection with exercise of options	40		—		393	—		—		—		—		393
Vesting of restricted stock units	139		—		—	—		—		—		—		—
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	—		—		—	49		(907)		—		—		(907)
Stock-based compensation expense	—		—		3,363	—		—		—		—		3,363
Comprehensive loss	—		—		—	—		—		(2,407)		(225)		(2,632)
Balances, September 30, 2021	37,274	$	6	$	418,933	9,974	$	(103,995)	$	(90,721)	$	(768)	$	223,455

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited)

6

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(in thousands)

	Nine Months Ended September 30,
	2022		2021
Cash flows from operating activities:
Net loss	$	(3,912)	$	(14,488)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		4,173		4,806
Stock-based compensation expense		14,561		9,474
Amortization of acquired intangible assets		2,605		2,467
Amortization of costs capitalized to obtain revenue contracts		1,127		499
Deferred taxes		46		87
Other		(41)		125
Changes in operating assets and liabilities:
Accounts receivable		(14,999)		440
Prepaid expenses and other current assets		(2,750)		1,848
Operating lease right-of-use assets		1,510		1,043
Other non-current assets		1,479		(1,211)
Accounts payable		(2,852)		(1,969)
Accrued compensation and related benefits		3,624		(142)
Accrued and other liabilities		2,560		(167)
Deferred revenues		2,322		3,542
Billings in excess of recognized revenues		183		(1,334)
Operating lease liabilities		(1,613)		(1,193)
Net cash provided by operating activities		8,023		3,827
Cash flows from investing activities:
Proceeds from maturities and sales of short-term investments		136,000		136,000
Purchases of short-term investments		(45,791)		(90,985)
Purchases of property and equipment		(6,651)		(2,713)
Prepayment for the purchase of property and equipment		(54)		—
Purchases of intangible assets		(150)		—
Net cash provided by investing activities		83,354		42,302
Cash flows from financing activities:
Proceeds from exercise of stock options		1,064		1,251
Proceeds from employee stock purchase plan		3,011		1,035
Payments for taxes related to net share settlement of equity awards		(5,790)		(3,257)
Repurchases of common stock		(22,471)		(4,523)
Net cash used in financing activities		(24,186)		(5,494)
Effect of exchange rate changes on cash and cash equivalents		(1,147)		(193)
Net change in cash, cash equivalents, and restricted cash		66,044		40,442
Cash, cash equivalents, and restricted cash at beginning of period		27,684		33,815
Cash, cash equivalents, and restricted cash at end of period	$	93,728	$	74,257
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheet:
Cash and cash equivalents	$	93,728	$	71,238
Restricted cash		—		3,019
Total cash, cash equivalents, and restricted cash	$	93,728	$	74,257

Continued on next page.

7

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS – CONTINUED

(unaudited)

(in thousands)

	Nine Months Ended September 30,
	2022		2021
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes	$	2,001	$	1,543
Cash paid for amounts included in the measurement of operating lease liabilities	$	1,219	$	1,538
Supplemental disclosure of noncash information:
Property and equipment, and intangible assets received and accrued in accounts payable and accrued and other liabilities	$	2,200	$	247
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment	$	336	$	963
Operating lease liabilities arising from obtaining right-of-use assets	$	2,268	$	—
Release of restricted cash reducing goodwill due to the acquisition purchase price adjustment	$	—	$	469

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited)

8

PDF SOLUTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments) to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the Securities and Exchange Commission on March 1, 2022.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions.

The accompanying Condensed Consolidated Balance Sheet at December 31, 2021, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include revenue recognition, the estimated useful lives of property and equipment and intangible assets, assumptions made in analysis of allowance for doubtful accounts, impairment of goodwill and long-lived assets, valuation for deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income tax uncertainties and contingencies. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position.

The global COVID-19 pandemic (“COVID-19”) has impacted the operations and purchasing decisions of companies worldwide. As of the date of issuance of the condensed consolidated financial statements, the Company is not aware of any specific event or circumstance relating to COVID-19 that would require updates to the Company’s estimates and judgments or revisions to the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the financial statements.

Recent Accounting Standards

Accounting Standards Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires measurement and recognition of expected credit losses for financial assets held at the reporting date based on internal information, external information, or a combination of both relating to past events, current conditions, and reasonable and supportable forecasts. ASU No. 2016-13 replaces the existing incurred loss impairment model with a forward-looking expected credit loss model, which will result in earlier recognition of credit losses. Subsequent to the issuance of ASU No. 2016-13, the FASB issued ASU No. 2018-19, Codification

9

Improvements to Topic 326, Financial Instruments – Credit Losses, ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instrument, ASU No. 2019-05, Financial Instruments – Credit Losses (Topic 326) Targeted Transition Relief, ASU No. 2016-13, ASU No. 2019-10 Financial Instruments-Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and ASU No. 2019-11 Codification Improvements to Topic 326, Financial Instruments-Credit Losses. The subsequent ASUs do not change the core principle of the guidance in ASU No. 2016-13. Instead, these amendments are intended to clarify and improve operability of certain topics included within ASU No. 2016-13.

Additionally, ASU No. 2019-10 defers the effective date for the adoption of the new standard on credit losses for public filers that are considered small reporting companies (“SRC”) as defined by the SEC to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, which will be fiscal 2023 for the Company. In February 2020, the FASB issued ASU 2020-02, which provides guidance regarding methodologies, documentation, and internal controls related to expected credit losses. The subsequent amendments will have the same effective date and transition requirements as ASU No. 2016-13. Topic 326 requires a modified retrospective approach by recording a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. While the Company is currently evaluating the impact of Topic 326, the Company does not expect the adoption of this ASU to have a material impact on its condensed consolidated financial statements or the related disclosure.

Management has reviewed other recently issued accounting pronouncements issued or proposed by the FASB, and does not believe any of these accounting pronouncements has had or will have a material impact on the condensed consolidated financial statements.

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

The Company derives revenue from two sources: Analytics revenue and Integrated Yield Ramp revenue.

The Company recognizes revenue in accordance with FASB ASC Topic 606, Revenue from Contracts with Customers, and its related amendments (collectively known as “ASC 606”). ASC 606 outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers. Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services.

The Company determines revenue recognition through the following five steps:

● Identification of the contract, or contracts, with a customer

● Identification of the performance obligations in the contract

● Determination of the transaction price

● Allocation of the transaction price to the performance obligations in the contract

● Recognition of revenue when, or as, performance obligations are satisfied

The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance, and collectability of consideration is probable.

Contracts with multiple performance obligations

The Company enters into contracts that can include various combinations of licenses, products and services, some of which are distinct and are accounted for as separate performance obligations. For contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the standalone selling price (“SSP”).

10

Analytics Revenue

Analytics revenue is derived from the following primary offerings: licenses and services for standalone software (which is primarily Exensio^® and Cimetrix^® products), software-as-a-service (“SaaS”) (which is primarily Exensio^® products), and DFI™ systems and CV^® systems that do not include performance incentives based on customers’ yield achievement.

Revenue from standalone software is recognized depending on whether the license is perpetual or time-based. Perpetual (one-time charge) license software is recognized at the time of the inception of the arrangement when control transfers to the customers, if the software license is considered as a separate performance obligation from the services offered by the Company. Revenue from post-contract support is recognized over the contract term on a straight-line basis, because we are providing (i) support and (ii) unspecified software updates on a when-and-if available basis over the contract term. Revenue from time-based-licensed software is allocated to each performance obligation and is recognized either at a point in time or over time as follows. The license component is recognized at the time when control transfers to customers, with the post-contract support component recognized ratably over the committed term of the contract. For contracts with any combination of licenses, support, and other services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from SaaS arrangements, which allow for the use of a cloud-based software product or service over a contractually determined period of time without the customer having to take possession of software, is accounted for as a subscription and is recognized as revenue ratably, on a straight-line basis, over the subscription period beginning on the date the service is first made available to customers. For contracts with any combination of SaaS and related services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from DFI systems and CV systems that do not include performance incentives based on customers’ yield achievement is recognized primarily as services are performed. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs. For those contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation. Where there are not discrete performance obligations, historically, revenue is primarily recognized as services are performed using a percentage of completion method based on costs or labor-hours inputs, whichever is the most appropriate measure of the progress towards completion of the contract. The estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

Integrated Yield Ramp Revenue

Integrated Yield Ramp revenue is derived from the Company’s fixed-fee engagements that include performance incentives based on customers’ yield achievement (which consists primarily of Gainshare royalties) typically based on customer’s wafer shipments, pertaining to these fixed-price contracts, which royalties are variable.

Revenue under these project-based contracts, which are delivered over a specific period of time, typically for a fixed fee component paid on a set schedule, is recognized as services are performed using a percentage of completion method based on costs or labor-inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs and allocates the transaction price of the contract to each performance obligation on a relative basis using SSP. Similar to the services provided in connection with DFI systems and CV systems that are contributing to Analytics revenue, due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

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The Gainshare royalty contained in Integrated Yield Ramp contracts is a variable fee related to continued usage of the Company’s intellectual property after the fixed-fee service period ends, based on a customer’s yield achievement. Revenue derived from Gainshare is contingent upon the Company’s customers reaching certain defined production yield levels. Gainshare royalty periods are generally subsequent to the delivery of all contractual services and performance obligations. The Company records Gainshare as a usage-based royalty derived from customers’ usage of intellectual property and records it in the same period in which the usage occurs.

Disaggregation of Revenue

The Company disaggregates revenue from contracts with customers into the timing of the transfer of goods and services and the geographical regions. The Company determined that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors.

The Company’s performance obligations are satisfied either over time or at a point-in-time. The following table represents a disaggregation of revenue percentage by timing of revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Over time	68		72	%	70	%	60	%
Point-in-time	32		28	%	30	%	40	%
Total	100	%	100	%	100	%	100	%

International revenues accounted for approximately 54% and 51% of our total revenues during the three and nine months ended September 30, 2022, respectively, compared to 53% and 57% of our total revenues during the three and nine months ended September 30, 2021, respectively. See Note 10, Customer and Geographic Information.

Significant Judgments

Judgments and estimates are required under ASC 606. Due to the complexity of certain contracts, the actual revenue recognition treatment required under ASC 606 for the Company’s arrangements may be dependent on contract-specific terms and may vary in some instances.

For revenue under project-based contracts for fixed-price implementation services, revenue is recognized as services are performed using a percentage-of-completion method based on costs or labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. Due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may result in increases or decreases in estimated revenues or costs, and such revisions are reflected in revenue on a cumulative catch-up basis in the period in which the circumstances that gave rise to the revision become known.

The Company’s contracts with customers often include promises to transfer products, licenses software and provide services, including professional services, technical support services, and rights to unspecified updates to a customer. Determining whether licenses and services are distinct performance obligations that should be accounted for separately, or not distinct and thus accounted for together, requires significant judgment. The Company rarely licenses software on a standalone basis, so the Company is required to estimate the range of SSPs for each performance obligation. In instances where SSP is not directly observable because the Company does not license the software or sell the service separately, the Company determines the SSP using information that may include market conditions and other observable inputs.

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The Company is required to record Gainshare royalty revenue in the same period in which the usage occurs. Because the Company generally does not receive the acknowledgment reports from its customers during a given quarter within the time frame necessary to adequately review the reports and include the actual amounts in quarterly results for such quarter, the Company accrues the related revenue based on estimates of customers underlying sales achievement. The Company’s estimation process can be based on historical data, trends, seasonality, changes in the contract rate, knowledge of the changes in the industry and changes in the customer’s manufacturing environment learned through discussions with customers and sales personnel. As a result of accruing revenue for the quarter based on such estimates, adjustments will be required in the following quarter to true-up revenue to the actual amounts reported.

Contract Balances

The Company performs its obligations under a contract with a customer by licensing software or providing services in exchange for consideration from the customer. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a receivable, a contract asset or a contract liability.

The Company classifies the right to consideration in exchange for software or services transferred to a customer as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional, as compared to a contract asset, which is a right to consideration that is conditional upon factors other than the passage of time. The majority of the Company’s contract assets represent unbilled amounts related to fixed-price service contracts when the revenue recognized exceeds the amount billed to the customer. The contract assets are generally classified as current and are recorded on a net basis with deferred revenue (i.e., contract liabilities) at the contract level. At September 30, 2022 and December 31, 2021, the total contract assets included in prepaid expenses and other current assets in the accompanying Condensed Consolidated Balance Sheets were $1.9 million and $0.4 million, respectively. The Company did not record any asset impairment charges related to contract assets for the periods presented.

Deferred revenues and billings in excess of recognized revenues consist substantially of amounts invoiced in advance of revenue recognition and are recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding twelve-month period are recorded as current deferred revenues and the remaining portion is recorded as non-current deferred revenues in the accompanying Condensed Consolidated Balance Sheets. Revenue recognized that was included in the deferred revenues and billings in excess of recognized revenues balances at the beginning of each reporting period was $10.6 million and $7.0 million during the three months ended September 30, 2022 and 2021, respectively, and $16.3 million and $13.8 million during the nine months ended September 30, 2022 and 2021, respectively.

At September 30, 2022, the aggregate amount of the transaction price allocated to the remaining performance obligations related to customer contracts that were unsatisfied or partially unsatisfied was approximately $185.4 million. Given the applicable contract terms with customers, the majority of this amount is expected to be recognized as revenue over the next two years, with the remainder in the following three years. This amount does not include insignificant contracts to which the customer is not committed, nor significant contracts for which we recognize revenue equal to the amount we have the right to invoice for services performed, or future sales-based or usage-based royalty payments in exchange for a license of intellectual property. This amount is subject to change due to future revaluations of variable consideration, terminations, other contract modifications, or currency adjustments. The estimated timing of the recognition of remaining unsatisfied performance obligations is subject to change and is affected by changes to the scope, change in timing of delivery of products and services, or contract modifications.

The adjustment to revenue recognized from performance obligations satisfied (or partially satisfied) in previous periods was an increase of $1.9 million and a decrease of $0.2 million during the three months ended September 30, 2022 and 2021, respectively, and an increase of $0.4 million and $34,000 during the nine months ended September 30, 2022 and 2021, respectively. These amounts primarily represent changes in estimated percentage-of-completion based contracts and changes in actual versus estimated Gainshare royalty.

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Costs to obtain or fulfill a contract

The Company capitalizes the incremental costs to obtain or fulfill a contract with a customer, including direct sales commissions and related fees, when it expects to recover those costs. Amortization expense related to these capitalized costs is recognized over the period associated with the revenue from which the cost was incurred. Total capitalized direct sales commission costs included in prepaid expenses and other current assets in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2022, and December 31, 2021, were $1.4 million and $0.6 million, respectively. Total capitalized direct sales commission costs included in other non-current assets in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2022, and December 31, 2021, were $1.7 million and $2.1 million, respectively. Amortization of these assets were $0.4 million and $0.2 million during the three months ended September 30, 2022 and 2021, respectively, and $1.1 million and $0.5 million during the nine months ended September 30, 2022 and 2021, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Practical expedient

The Company does not adjust the transaction price for the effects of a significant financing component when the period between the transfers of the promised good or service to the customer and payment for that good or service by the customer is expected to be one year or less. The Company assessed each of its revenue generating arrangements in order to determine whether a significant financing component exists, and determined its contracts did not include a significant financing component during the three and nine months ended September 30, 2022 and 2021.

3. STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS

On July 29, 2020, the Company entered into a long-term strategic partnership with Advantest Corporation through its wholly-owned subsidiary, Advantest America, Inc. (collectively referred to herein as “Advantest”) that included the following agreements.

● A Securities Purchase Agreement for the purchase by Advantest of an aggregate of 3,306,924 shares of the Company’s common stock for aggregate gross proceeds of $65.2 million and a related Stockholder Agreement.

● An Amendment #1 to that certain Software License and Related Services Agreement, dated as of March 25, 2020, for an exclusive commercial arrangement in which the Company and Advantest collaborate on, and the Company initially hosts, develops and maintains, an Advantest-specific cloud layer on the Exensio platform. On June 5, 2022, the parties amended Amendment #1 to provide another approved DEX Site (as defined therein).  

● An Amended and Restated Master Development Agreement with Advantest, pursuant to which the Company and Advantest agreed to collaborate on extensions to or combinations of both of their existing technology and new technology to address mutual customers’ needs through one or more development phases subject to certain conditions as set forth therein. Costs and expenses incurred related to this agreement have not been significant for the three and nine months ended September 30, 2022 and 2021.

● A Master Commercial Terms and Support Services Agreement for the commercialization and support of integrated products of the Company and Advantest that are the outcome of the above development agreement. No material costs and expenses were incurred related to the Commercial Agreement with Advantest during the three and nine months ended September 30, 2022 and 2021.

Analytics revenue recognized from Advantest was $2.8 million and $8.1 million during the three and nine months ended September 30, 2022, respectively, compared to $2.7 million and $7.9 million during the three and nine months ended September 30, 2021, respectively. Accounts receivable from Advantest amounted to $10.4 million as of September 30, 2022, and nil as of December 31, 2021, and deferred revenue amounted to $9.1 million and $6.8 million as of September 30, 2022 and December 31, 2021, respectively. There was no occurrence of any termination events under these agreements as of the issuance of these condensed consolidated financial statements.

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The Company carries out transactions with Advantest on arm’s length commercial customary terms.

4. BALANCE SHEET COMPONENTS

Accounts receivable

Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within a 12-month period. Unbilled accounts receivable, included in accounts receivable, totaled $9.8 million and $11.8 million as of September 30, 2022, and December 31, 2021, respectively. Unbilled accounts receivable that are not expected to be billed and collected during the succeeding 12-month period is recorded in other non-current assets and totaled $1.0 million and $1.3 million as of September 30, 2022, and December 31, 2021, respectively.

The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.

Property and equipment

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

	September 30,		December 31,
	2022		2021
Computer equipment	$	11,711	$	11,924
Software		5,359		5,419
Furniture, fixtures and equipment		2,467		2,506
Leasehold improvements		6,277		6,272
Laboratory and other equipment		4,340		3,981
Test equipment		28,311		24,452
Construction-in-progress		24,965		22,158
		83,430		76,712
Less: Accumulated depreciation and amortization		(44,690)		(41,417)
Total	$	38,740	$	35,295

Test equipment mainly includes DFI™ systems and CV^® systems assets at customer sites that are contributing to revenue. Among assets under construction, the construction-in-progress balance related to construction of DFI™ systems assets amounted to $20.1 million and $20.0 million as of September 30, 2022, and December 31, 2021, respectively. Depreciation and amortization expense was $1.4 million and $1.5 million during the three months ended September 30, 2022 and 2021, respectively, and $4.2 million and $4.8 million during the nine months ended September 30, 2022 and 2021, respectively.

In the fourth quarter of 2021, the Company wrote down the value of its property and equipment by $3.2 million related to its first-generation of e-beam tools for DFI™ systems wherein carrying values may not be fully recoverable due to lack of market demand and future needs of our customers for these tools.

Goodwill and Intangible Assets, Net

As of September 30, 2022, and December 31, 2021, the carrying amount of goodwill was $14.1 million.

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Intangible assets, net, consisted of the following (in thousands):

		September 30, 2022						December 31, 2021
	Amortization	Gross				Net		Gross				Net
	Period	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
	(Years)	Amount		Amortization		Amount		Amount		Amortization		Amount
Acquired identifiable intangibles:
Customer relationships	1-10	$	9,407	$	(6,524)	$	2,883	$	9,407	$	(6,041)	$	3,366
Developed technology	4-9		33,635		(19,046)		14,589		33,635		(17,250)		16,385
Tradename and trademarks	2-10		1,598		(892)		706		1,598		(812)		786
Patent	7-10		2,100		(1,674)		426		1,800		(1,640)		160
Noncompetition agreements	3		848		(518)		330		848		(306)		542
Total		$	47,588	$	(28,654)	$	18,934	$	47,288	$	(26,049)	$	21,239

The weighted average amortization period for acquired identifiable intangible assets was 6.1 years as of September 30, 2022. The following table summarizes intangible assets amortization expense in the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss) (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Amortization of acquired technology included under Costs of Revenues	$	553	$	456	$	1,659	$	1,525
Amortization of acquired intangible assets presented separately under Costs and Expenses		318		314		946		942
Total amortization of acquired intangible assets	$	871	$	770	$	2,605	$	2,467

The Company expects annual amortization of acquired identifiable intangible assets to be as follows (in thousands):

Year Ending December 31,	Amount
2022 (remaining three months)	$	879
2023		3,491
2024		3,093
2025		2,928
2026		2,759
2027 and thereafter		5,784
Total future amortization expense	$	18,934

There were no impairment charges for goodwill and intangible assets during the three and nine months ended September 30, 2022 and 2021.

5. LEASES

The Company leases administrative and sales offices and certain equipment under non-cancellable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various dates through 2028. The Company had no leases that were classified as a financing lease as of September 30, 2022, and December 31, 2021.

In the first quarter of 2022, the Company early terminated an office lease contract. The termination of this lease reduced the Company’s operating lease right-of-use assets and lease liabilities by approximately $0.5 million and $0.6 million, respectively. The gain from the lease termination of approximately $0.1 million was recorded under selling, general and administrative expense in the accompanying Condensed Consolidated Statement of Comprehensive Income (Loss) for the nine months ended September 30, 2022.

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Lease expense was comprised of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Operating lease expense (1)	$	375	$	448	$	1,073	$	1,417
Short-term lease and variable lease expense (2)		244		196		801		602
Total lease expense	$	619	$	644	$	1,874	$	2,019

(1) Net of gain recognized upon lease termination of $0.1 million in the nine months ended September 30, 2022.

(2) Leases with an initial term of 12 months or less are not recorded on the accompanying Condensed Consolidated Balance Sheets, and the Company recognizes lease expense for these leases on a straight-line basis over the lease term. Variable lease expense for the periods presented primarily included common area maintenance charges.

Supplemental condensed consolidated balance sheets information related to operating leases was as follows:

	September 30,			December 31,
	2022			2021
Weighted average remaining lease term under operating ROU leases (in years)		5.6			5.7
Weighted average discount rate for operating lease liabilities		4.82	%		5.25	%

Maturities of operating lease liabilities as of September 30, 2022, were as follows (in thousands):

Year Ending December 31,	Amount (1)
2022 (remaining three months)	$	400
2023		1,600
2024		1,538
2025		1,454
2026		1,355
2027 and thereafter		2,286
Total future minimum lease payments	$	8,633
Less: Interest (2)		(1,111)
Present value of future minimum lease payments under operating lease liabilities (3)	$	7,522

(1) As of September 30, 2022, the total operating lease liability includes approximately $0.9 million related to an option to extend a lease term that is reasonably certain to be exercised.

(2) Calculated using incremental borrowing interest rate for each lease.

(3) Includes the current portion of operating lease liabilities of $1.4 million as of September 30, 2022.

6. STOCKHOLDERS’ EQUITY

Stock Repurchase Program

On June 4, 2020, the Company’s Board of Directors adopted a stock repurchase program (the “2020 Program”) to repurchase up to $25.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, including through Rule 10b5-1 plans, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 218,858 shares under the 2020 Program at an average price of $26.40 per share for an aggregate total price of $5.8 million. During the nine months ended September 30, 2021, the Company repurchased 251,212 shares under the 2020 Program at an average price of $18.01 per share for an aggregate total price of $4.5 million. Through April 10, 2022, 470,070 shares had been repurchased under the 2020 Program at an average price of $21.91 per share, for an aggregate total price of $10.3 million.

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On April 11, 2022, the Board of Directors terminated the 2020 Program, and adopted a new program (the “2022 Program”) to repurchase up to $35.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, from time to time, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 714,600 shares under the 2022 Program at an average price of $23.36 per share for an aggregate total price of $16.7 million.

7. EMPLOYEE BENEFIT PLANS

On September 30, 2022, the Company had the following stock-based compensation plans:

Employee Stock Purchase Plan

In July 2001, the Company’s stockholders initially approved the 2001 Employee Stock Purchase Plan, which was subsequently amended and restated in 2010 (as amended, the “2010 Purchase Plan”) to extend the term of the plan through May 17, 2020. Under the 2010 Purchase Plan, eligible employees could contribute up to 10% of their compensation, as defined in the 2010 Purchase Plan, towards the purchase of shares of PDF common stock at a price of 85% of the lower of the fair market value at the beginning of the offering period or the end of the purchase period. The 2010 Purchase Plan provided for twenty-four-month offering periods with four six-month purchase periods in each offering period. The 2010 Purchase Plan expired on May 17, 2020. Existing offering periods under the 2010 Plan continued through the applicable expiration date and the final offering period expired on January 31, 2022. On June 15, 2021, the Company’s stockholders approved the 2021 Employee Stock Purchase Plan, which has a ten-year term (the “2021 Purchase Plan” and, together with the 2010 Purchase Plan, the “Employee Purchase Plans”). The terms of 2021 Purchase Plan are substantially similar to those of the 2010 Purchase Plan. A twenty-four-month offering period under the 2021 Purchase Plan commenced on August 1, 2021.

The Company estimated the fair value of purchase rights granted under the 2021 Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values:

	Nine Months Ended September 30,
	2022			2021
Expected life (in years)		1.25			1.25
Volatility		48.73	%		48.00	%
Risk-free interest rate		2.75	%		0.11	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted during the period	$	10.00		$	6.71

During the three months ended September 30, 2022, a total of 92,043 shares were issued under the 2021 Purchase Plan, at a weighted-average purchase price of $16.40 per share. During the nine months ended September 30, 2022, a total of 182,083 shares were issued under the 2021 Purchase Plan, at a weighted-average purchase price of $16.15 per share. During the nine months ended September 30, 2022 and 2021, a total of 5,203 and 108,623 shares, respectively, were issued under the 2010 Purchase Plan, at a weighted-average purchase price of $13.40 per share and $9.53 per share, respectively. As of September 30, 2022, unrecognized compensation cost related to the 2021 Purchase Plan was $1.6 million. This estimated unrecognized cost is expected to be recognized over a weighted average period of 1.2 years. There was no unrecognized compensation cost related to the 2010 Purchase Plan as of September 30, 2022.

As of September 30, 2022, 817,917 shares were available for future issuance under the 2021 Purchase Plan.

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Stock Incentive Plans

On November 16, 2011, the Company’s stockholders initially approved the 2011 Stock Incentive Plan, which has been amended and restated and approved by the Company’s stockholders a number of times since then (as amended, the “2011 Plan”). Under the 2011 Plan, the Company may award stock options, stock appreciation rights (“SARs”), stock grants or stock units covering shares of the Company’s common stock to employees, directors, non-employee directors and contractors. The aggregate number of shares reserved for awards under the 2011 Plan is 12,800,000 shares, plus up to 3,500,000 shares previously issued under the 2001 Stock Plan adopted by the Company in 2001, which expired in 2011 (the “2001 Plan”) that are either (i) forfeited or (ii) repurchased by the Company or are shares subject to awards previously issued under the 2001 Plan that expire or that terminate without having been exercised or settled in full on or after November 16, 2011. In case of awards other than options or SARs, the aggregate number of shares reserved under the 2011 Plan will be decreased at a rate of 1.33 shares issued pursuant to such awards. The exercise price for stock options must generally be at prices no less than the fair market value at the date of grant. Stock options generally expire ten years from the date of grant and become vested and exercisable over a four-year period.

As of September 30, 2022, 13.3 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 3.5 million shares were available for future grant. The number of shares reserved and available under the 2011 Plan includes 0.5 million shares that were subject to awards previously made under the 2001 Plan and were forfeited, expired or repurchased by the Company after the adoption of the 2011 Plan through September 30, 2022. As of September 30, 2022, there were no outstanding awards that had been granted outside of the 2011 or 2001 Plans (collectively, the “Stock Plans”).

The Company estimated the fair value of share-based awards granted under the 2011 Stock Plan during the period using the Black-Scholes-Merton option-pricing model. There were no stock options granted during the three and nine months ended September 30, 2022 and 2021.

Stock-Based Compensation

Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expense before taxes related to the Company’s stock plans and employee stock purchase plans was allocated as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Costs of revenues	$	854	$	670	$	2,237	$	1,860
Research and development		2,180		1,299		7,158		4,013
Selling, general and administrative		2,102		1,394		5,166		3,601
Stock-based compensation expenses	$	5,136	$	3,363	$	14,561	$	9,474

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Additional information with respect to options under the Stock Plans during the nine months ended September 30, 2022, is as follows:

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
	(in thousands)	per Share		(Years)	(in thousands)
Outstanding, January 1, 2022	226	$	12.78
Granted	—		—
Exercised	(109)		9.79
Canceled	(6)		13.35
Expired	(2)		8.79
Outstanding, September 30, 2022	109	$	15.77	3.93	$	960
Vested and expected to vest, September 30, 2022	109	$	15.77	3.91	$	955
Exercisable, September 30, 2022	94	$	15.75	3.42	$	825

The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $24.53 per share as of September 30, 2022. The total intrinsic value of options exercised was $1.8 million during the nine months ended September 30, 2022.

As of September 30, 2022, there was $0.1 million of total unrecognized compensation cost, net of forfeiture, related to unvested stock options, which is expected to be recognized over a weighted average period of 1.2 years. The total fair value of shares vested was immaterial during the nine months ended September 30, 2022.

Nonvested restricted stock unit activity during the nine months ended September 30, 2022, was as follows:

		Weighted
		Average Grant
	Shares	Date Fair Value
	(in thousands)	Per Share
Nonvested, January 1, 2022	1,872	$	18.24
Granted	1,144	$	22.74
Vested	(738)	$	18.13
Forfeited	(75)	$	19.41
Nonvested, September 30, 2022	2,203	$	20.57

As of September 30, 2022, there was $35.0 million of total unrecognized compensation cost related to restricted stock units. That cost is expected to be recognized over a weighted average period of 2.7 years. Restricted stock units do not have rights to dividends prior to vesting.

8. INCOME TAXES

Income tax expense increased by $1.8 million for the nine months ended September 30, 2022, to a $3.3 million income tax expense as compared to $1.5 million for the nine months ended September 30, 2021. The Company’s effective tax rate expense was (547.7%) and (12.0%) for the nine months ended September 30, 2022 and 2021, respectively. The Company’s effective tax rate expense increased in the nine months ended September 30, 2022, as compared to the same period in 2021, primarily due to increases in foreign withholding taxes and changes in the geographic mix of worldwide income, which is subject to taxation at different statutory tax rates.

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The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of September 30, 2022, was $15.2 million, of which $1.8 million, if recognized, would affect the Company’s effective tax rate. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2021, was $14.7 million, of which $2.0 million, if recognized, would affect the Company’s effective tax rate. As of September 30, 2022, the Company has recorded unrecognized tax benefits of $2.3 million, including interest and penalties of $0.6 million, as long-term taxes payable in the accompanying Condensed Consolidated Balance Sheet. The remaining $13.5 million has been recorded net of the Company’s deferred tax assets (“DTAs”), which is subject to a full valuation allowance.

The valuation allowance was approximately $51.6 million as of September 30, 2022, and December 31, 2021, which was related to U.S. net federal and state DTAs. The worldwide net deferred tax assets balance as of September 30, 2022, and December 31, 2021 were not significant.

The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. For U.S. federal and California income tax purposes, the statute of limitations currently remains open for the tax years ending 2018 to present and 2017 to present, respectively. In addition, due to net operating loss carryback claims, the tax years 2013 through 2015 may be subject to federal examination and all of the net operating loss and research and development credit carryforwards that may be utilized in future years may be subject to federal and state examination. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

9. NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per share (in thousands except per share amount):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	1,385	$	(2,407)	$	(3,912)	$	(14,488)
Denominator:
Basic weighted-average shares outstanding		37,226		37,221		37,285		37,067
Effect of dilutive options and restricted stock units		828		—		—		—
Diluted weighted-average shares outstanding		38,054		37,221		37,285		37,067
Net income (loss) per share – Basic	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)
Net income (loss) per share – Diluted	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)

For the nine months ended September 30, 2022 and for the three and nine months ended 2021, because the Company was in a loss position, basic net loss per share is the same as diluted net loss per share as the inclusion of the potential common shares would have been anti-dilutive.

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The following table sets forth potential shares of common stock that were not included in the diluted net income (loss) per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):

	Three Months Ended September 30,		Nine Months Ended September 30,
	2022	2021	2022	2021
Outstanding options	—	128	63	182
Nonvested restricted stock units	62	915	784	997
Employee Stock Purchase Plan	—	30	75	14
Total	62	1,073	922	1,193

10. CUSTOMER AND GEOGRAPHIC INFORMATION

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.

The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions, allocation of resources, and assessing financial performance. Accordingly, the Company considers itself to be in one operating and reporting segment, specifically the provision of services for differentiated data and analytics solutions to the semiconductor and electronics industries.

The Company had revenues from individual customers that are approximately 10% or more of the Company’s consolidated total revenues as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
Customer	2022		2021		2022		2021
A	28	%	25	%	30	%	12	%
B	16	%	*	%	11	%	*	%
C	*	%	*	%	*	%	10	%

* represents less than 10%

Gross accounts receivable balances (including amounts that are unbilled) from individual customers that are approximately 10% or more of the Company’s gross accounts receivable balance as follows:

	September 30,		December 31,
Customer	2022		2021
A	27	%	29	%
B	14	%	15	%
C	18	%	*	%

* represents less than 10%

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Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (amounts in thousands):

	Three Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	18,292	46	%	$	13,983	47	%
China		9,555	24			4,038	14
Japan		2,818	7			2,515	9
Rest of the world		9,195	23			9,019	30
Total revenue	$	39,860	100	%	$	29,555	100	%

	Nine Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	52,869	49	%	$	34,634	43	%
China		18,214	17			10,065	12
Japan		8,219	8			8,543	10
Rest of the world		28,724	26			27,932	35
Total revenue	$	108,026	100	%	$	81,174	100	%

Long-lived assets, net by geographic area are as follows (in thousands):

	September 30,		December 31,
	2022		2021
United States (1)	$	43,469	$	39,158
Rest of the world		1,293		1,545
Total long-lived assets, net	$	44,762	$	40,703

(1) Includes assets deployed at customer sites which could be outside the U.S.

11. FAIR VALUE MEASUREMENTS

Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its

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own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.

Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following table represents the Company’s assets measured at fair value on a recurring basis as of September 30, 2022, and December 31, 2021, and the basis for those measurements (in thousands):

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other
			Identical		Observable		Significant
	September 30,		Assets		Inputs		Unobservable
Assets	2022		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents
Money market mutual funds	$	70,934	$	70,934	$	—	$	—
U.S. Government securities (1)		2,994		2,994		—		—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		22,357		22,357		—		—
Total	$	96,285	$	96,285	$	—	$	—

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents
Money market mutual funds	$	12,474	$	12,474	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		112,542		112,542		—		—
Total	$	125,016	$	125,016	$	—	$	—

(1) As of September 30, 2022, and December 31, 2021, the amortized cost of the Company’s investments in U.S Government securities approximated their fair value due to their short-term maturities, and there have been no events or changes in circumstances that would have had a significant effect on the fair value of these securities in the periods presented. There was no material realized or unrealized gains or losses, either individually or in the aggregate.

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12. COMMITMENTS AND CONTINGENCIES

Strategic Partnership with Advantest — See Note 3, Strategic Partnership Agreement with Advantest And Related Party Transactions, for the discussion about the Company’s commitments under the strategic partnership with Advantest.

Operating Leases — Refer to Note 5, Leases, for the discussion about the Company’s lease commitments.

Indemnifications — The Company generally provides a warranty to its customers that its software will perform substantially in accordance with documented specifications typically for a period of 90 days following initial delivery of its products. The Company also indemnifies certain customers from third-party claims of intellectual property infringement relating to the use of its products. Historically, costs related to these guarantees have not been significant. The Company is unable to estimate the maximum potential impact of these guarantees on its future results of operations.

Purchase Obligations — The Company has purchase obligations with certain suppliers for the purchase of goods and services entered in the ordinary course of business. As of September 30, 2022, total outstanding purchase obligations were $13.7 million, the majority of which is due within the next 12 months.

Indemnification of Officers and Directors — As permitted by the Delaware general corporation law, the Company has included a provision in its certificate of incorporation to eliminate the personal liability of its officers and directors for monetary damages for breach or alleged breach of their fiduciary duties as officers or directors, other than in cases of fraud or other willful misconduct.

In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may be indemnified. The Company has entered into indemnification agreements with its officers and directors containing provisions that are in some respects broader than the specific indemnification provisions contained in the Delaware general corporation law. The indemnification agreements require the Company to indemnify its officers and directors against liabilities that may arise by reason of their status or service as officers and directors other than for liabilities arising from willful misconduct of a culpable nature, to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified, and to obtain directors’ and officers’ insurance if available on reasonable terms. The Company has obtained directors’ and officers’ liability insurance in amounts comparable to other companies of the Company’s size and in the Company’s industry. Since a maximum obligation of the Company is not explicitly stated in the Company’s Bylaws or in its indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated.

Legal Proceedings — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable, and the loss can be reasonably estimated in accordance with FASB requirements. As of September 30, 2022, except as disclosed below, the Company was not party to any material legal proceedings for which a loss was probable or an amount was accrued.

On May 6, 2020, the Company initiated an arbitration proceeding with the Hong Kong International Arbitration Center against SMIC New Technology Research & Development (Shanghai) Corporation (“SMIC”) due to SMIC’s failure to pay fees due to PDF under a series of contracts. The Company seeks to recover the unpaid fees, a declaration requiring SMIC to pay fees under the contracts in the future, and costs associated with bringing the arbitration proceeding. SMIC denies liability and the arbitration is on-going.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

The following discussion of our financial condition and results of operations contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical fact may be forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “could,” “projected,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential”, “target” or “continue,” the negative effect of terms like these or other similar expressions. These statements include, but are not limited to, statements concerning: expectations about the effectiveness of our business and technology strategies; expectations regarding global economic trends; the impact of rising inflation and global interest rates, expectations regarding recent and future acquisitions; current semiconductor industry trends; expectations of the success and market acceptance of our intellectual property and our solutions; the continuing impact of COVID-19 on the semiconductor industry and our business, supply chain disruptions, possible impacts from the evolving trade regulatory environment and geopolitical tensions and our ability to obtain additional financing if needed. These forward-looking statements are only predictions. Forward-looking statements are based on current expectations and projections about future events and are inherently subject to a variety of risks and uncertainties, many of which are beyond our control, which could cause actual results to differ materially from those anticipated or projected. All forward-looking statements included in this document are based on information available to us on the date of filing and we further caution investors that our business and financial performance are subject to substantial risks and uncertainties. We assume no obligation to update any such forward-looking statements. In evaluating these statements, you should specifically consider various factors, including the risk factors set forth in Item 1. “Business” and Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10 K for the year ended December 31, 2021, filed with the Securities and Exchange Commission (“SEC”) on March 1, 2022. All references to “we”, “us”, “our”, “PDF”, “PDF Solutions” or “the Company” refer to PDF Solutions, Inc.

Cimetrix, CV, DFI, Exensio, PDF Solutions and the PDF Solutions logo are trademarks or registered trademarks of PDF Solutions, Inc. or its subsidiaries.

Overview

We provide comprehensive data solutions designed to empower organizations across the semiconductor ecosystem to improve the yield and quality of their products and operational efficiency for increased profitability. Our offerings include proprietary software, professional services based on proven methodologies and using third-party cloud-hosting platforms for software-as-a-service (“SaaS”), electrical measurement hardware tools, and physical intellectual property (“IP”) for integrated circuit (“IC”) designs. We derive revenues from two sources, Analytics and Integrated Yield Ramp, by monetizing our offerings through contract fees for on-premise licenses, SaaS, and other professional services and a value-based, variable fee or royalty, which we call Gainshare, on some Characterization services engagements. Our products and services have been sold to integrated device manufacturers (“IDMs”), fabless semiconductor companies, foundries, equipment manufacturers, electronics manufacturing suppliers (“EMS”), original device manufacturers (“ODMs”), out-sourced semiconductor assembly and test (“OSATs”), and system houses. We are headquartered in Santa Clara, California and also operate worldwide with offices in Canada, China, France, Germany, Italy, Japan, Korea, and Taiwan.

Industry Trends

The ongoing COVID-19 pandemic has significantly affected how we and our customers operate our businesses. We continue to closely monitor the COVID-19 situation with a focus on our employees’ safety as our employees, who were working in-office prior to COVID-19, have continued to return to working in-office for a certain number of days each week, subject to any current and future local restrictions. In addition, our personnel worldwide can be subject to various country-to-country travel restrictions, which limits the ability of some employees to travel to other offices or customer sites. We believe the lack of an ability to meet in person during most of 2021 and to some degree the first half of 2022 made it harder for us to sell complex or new technologies to some customers during these periods. As we continue to meet with these customers in person, we believe we may improve traction with them. To date, we have been able to provide uninterrupted access to our products and services due to our globally distributed workforce, many of whom were working remotely prior to the pandemic,

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and our pre-existing infrastructure, which supports secure access to our internal systems. The total duration and full extent of the impact from the COVID-19 pandemic depends on future developments that cannot be accurately predicted at this time, such as the ultimate severity and transmission rate of the virus and its variants, the extent and effectiveness of containment actions and vaccinations, and the impact of these and other factors on our employees, customers, partners, and suppliers. To date, one effect of the COVID-19 pandemic is a global shortage in semiconductors due primarily to supply chain disruptions and many companies, including in the automotive industry, have announced shortages in production. Although this shortage has not materially affected our business, this trend may affect our future business opportunities, particularly future Gainshare and Cimetrix run-time licenses, if our customers’ production volumes decrease.

Certain other trends may affect our Analytics revenue specifically. In particular, the confluence of Industry 4.0 (i.e., the fourth industrial revolution, or the automation and data exchange in manufacturing technologies and processes) and cloud computing (i.e., the on-demand availability of computing resources and data storage without direct active management by the user) is driving increased innovation in semiconductor and electronics manufacturing and analytics, as well as in the organization of IT networks and computing at semiconductor and electronics companies across the ecosystem. First, the ubiquity of wireless connectivity and sensor technology enables any manufacturing company to augment its factories and visualize its entire production line. In parallel, the cost per terabyte of data storage has continually decreased year to year. The combination of these two trends means that more data is collected and stored than ever before. Further, semiconductor companies are striving to analyze these very large data sets in real-time to make rapid decisions that measurably improve manufacturing efficiency and quality. In parallel, the traditional practice of on-site data storage, even for highly sensitive data, is changing. The ability to cost-effectively and securely store, analyze, and retrieve massive quantities of data from the cloud versus on-premise enables data to be utilized across a much broader population of users, frequently resulting in greater demands on analytics programs. The combination of these latter two trends means that cloud-based, analytic programs that effectively manage identity management, physical security, and data protection are increasingly in demand for insights and efficiencies across the organizations of these companies. We believe that all these trends will continue for the next few years, and the challenges involved in adopting Industry 4.0 and secure cloud computing will create opportunities for our combination of advanced analytics capabilities, proven and established supporting infrastructure, and professional services to configure our products to meet customers’ specialized needs.

Other trends may continue to affect our characterization services business and Integrated Yield Ramp revenue specifically. The logic foundry market at the leading-edge nodes, such as 10nm, 7nm, and smaller, underwent significant change over the past few years. The leading foundry continues to dominate market share as other foundries started later than originally forecast in some cases. This trend will likely continue to impact our characterization services business on these nodes. We expect most logic foundries to invest in derivatives of older process nodes, such as 28nm and 14nm, to extract additional value as many of their customers will not move to advanced nodes due to either technological barriers or restrictive economics. Foundries that participate at leading edge nodes are expected to continue to invest in new technologies such as memory, packaging, and multi-patterned and extreme ultraviolet lithography, as well as new innovations in process control and variability management. We expect China’s investment in semiconductors to continue. In order for these trends to provide opportunities for us to increase our business leveraging electrical characterization, Chinese semiconductors manufacturers will need to increase their production volumes on advanced technology nodes and continue to engage foreign suppliers, subject to compliance with changing U.S. export restrictions. As a result of these market developments, we have chosen to focus our resources and investments in products, services, and solutions for analytics.

There are other business trends that may affect our business opportunities generally. For instance, the demand for consumer electronics, communications devices, and high-performance computing continues to drive technological innovation in the semiconductor industry as the need for products with greater performance, lower power consumption, reduced costs, and smaller size continues to grow with each new product generation. In addition, advances in computing systems and mobile devices continue to fuel demand for higher capacity memory chips. To meet these demands, IC manufacturers and designers are constantly challenged to improve the overall performance of their ICs by designing and manufacturing ICs with more embedded applications to create greater functionality while lowering power and cost per transistor. As this trend continues, companies will continually be challenged to improve process capabilities to optimally produce ICs with minimal random and systematic yield loss, which is driven by the lack of compatibility between the design and its respective manufacturing process. We believe that these difficulties will continue to create a need for our products and services that address yield loss across the IC product life cycle. For further instance, the ongoing Russo-Ukrainian war is negatively impacting the global supply chain generally, e.g., reducing the production of millions of new cars and trucks, which indirectly impacts the global semiconductor

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market, and also affecting global energy markets and causing shortages and rising prices of semiconductors directly. Ukraine and Russia are both top suppliers of neon gas that is used in lasers and chip manufacturing, and Russia is a major producer of palladium, a rare metal used in computer components, sensors, and fuel cells. Limitations on the supply of these two elements can severely affect the global supply chain, which is already scarce in semiconductors. Russia also supplies much of the world’s premium nickel, which is used by electronics manufacturers to make batteries. If these trends continue or worsen, we may face a shortage of critical components for our own tools and our business may suffer if the business of our customers decreases. Rising prices of semiconductors may mean increased royalties to us and increased Integrated Yield Ramp revenue. We are also actively monitoring the macroeconomic environment, including the potential impact of inflationary pressures and increasing global interest rates, for impacts on our material, labor and other costs.

The U.S. government continues to expand and intensify export controls and sanctions. This includes the addition of many People’s Republic of China (“P.R.C.”) and Russian companies to the U.S. Export Administration Regulations (“EAR”) Entity List or Unverified List. These listings restrict supply to designees of items that are subject to the EAR. After an internal evaluation, we determined that a large percentage of our software products are not of U.S. origin and are, thus, not subject to the EAR. Our standard operations include development, distribution processes, software download sites, and professional service centers and processes located in various geographies around the world to better serve our customers. Some customers in the P.R.C., in particular, have nonetheless expressed concerns to us that continued action by the U.S. government could potentially interrupt their ability to make use of our products or services.

In October 2022, the U.S. government issued an interim final rule (87 Fed. Reg. 62186) with additional export control regulations that may be relevant to our business. Among several changes, the U.S. government imposed restrictions on supply, to any P.R.C. fabrication facility that produces certain advanced logic or memory ICs, when the supply involves a product or technology (“Item”) that is “subject to the EAR” or involves a “U.S. person” in providing, facilitating providing, or servicing an Item that is “not subject to the EAR.” Another change is a restriction on supply of an item “subject to the EAR” destined for use in P.R.C. development or production of certain IC manufacturing equipment. Industry members, including our Company, continue to generate questions and evaluate the effects of the new regulations. The U.S. government has committed to “rolling guidance” to resolve issues and answer questions in the coming months. In addition, the U.S. government expanded the “foreign direct product rule,” together with EAR jurisdiction and restrictions, to additional foreign-produced Items of certain types or in connection with additional restricted parties in the P.R.C. Based on our current assessments, we expect the impact of these expanded trade restrictions on our business to be limited. We will continue to monitor for any further trade restrictions, other regulatory or policy changes by the U.S. or foreign governments and any actions in response, and remain committed to complying with applicable law. The uncertainty caused by these recent regulations and the potential for additional future restrictions could, nonetheless, negatively affect our future sales in the P.R.C. market.

Geopolitical tension between the U.S. and P.R.C. continues to increase, with both governments taking actions and making statements that lean in the direction of confrontation, including on the issue of Taiwan. Growing tension also increases risk of unintended mishap, mistake, or accident leading to escalation and global supply chain disruption. The continuing tension between the U.S. and P.R.C. and/or Russian governments in trade and security matters or the perception of that tension could lead to disruptions or reductions in international trade, deter or prevent purchasing activity of customers, and negatively impact our China sales (with respect to U.S.-P.R.C. tensions) and financial results in general (with respect to global tensions).

Financial Highlights

Financial highlights for the three months ended September 30, 2022, are as follows:

● Total revenues were $39.9 million, an increase of $10.3 million, or 35%, compared to the three months ended September 30, 2021. Analytics revenue was $32.9 million, an increase of $5.7 million, or 21%, compared to the three months ended September 30, 2021. The increase in Analytics revenue was driven by increases in revenue from CV systems and DFI systems across multiple contracts and customers, and increases in revenues from Cimetrix and Exensio software licenses. Integrated Yield Ramp revenue increased $4.6 million, or 196%, compared to the three months ended September 30, 2021, primarily due to an increase in Gainshare royalty from increased customer wafer shipments at non-leading edge nodes and hours worked on fixed fee engagements.

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● Costs of revenues increased $1.5 million, compared to the three months ended September 30, 2021, primarily due to increases in personnel-related costs, cloud-delivery costs and subcontractor costs. These increases were partially offset by decreases in facilities and information technology-related costs including depreciation expenses.

● Net income was $1.4 million, compared to a $2.4 million loss for the three months ended September 30, 2021. The increase in net income was primarily attributable to an increase in total revenues and other income from net foreign currency exchange gain, partially offset by increases in costs of revenues and operating expenses related primarily to our research and development, sales and marketing activities, and general and administrative expenses, which were primarily related to increases in personnel-related costs, cloud-services related costs, subcontractor costs, and an increase in income tax expense.

Financial highlights for the nine months ended September 30, 2022, are as follows:

● Total revenues were $108.0 million, an increase of $26.9 million, or 33%, compared to the nine months ended September 30, 2021. Analytics revenue was $94.4 million, an increase of $28.3 million, or 43%, compared to the nine months ended September 30, 2021. The increase in Analytics revenue was driven by increases in revenue from CV systems and DFI systems across multiple contracts and customers, and increases in revenues from Cimetrix and Exensio software licenses. Integrated Yield Ramp revenue decreased $1.4 million, or 9%, compared to the nine months ended September 30, 2021, primarily due to the end of Gainshare periods, partially offset by an increase in hours worked on fixed fee engagements.

● Costs of revenues increased $3.6 million, compared to the nine months ended September 30, 2021, primarily due to increases in personnel-related costs, cloud-delivery costs, and subcontractor costs. These increases were partially offset by decreases in facilities and information technology-related costs, including depreciation expenses, software royalties, and license expenses.

● Net loss was $3.9 million, compared to a $14.5 million loss for the nine months ended September 30, 2021. The decrease in net loss was primarily attributable to an increase in total revenues and other income from net foreign currency exchange gain, partially offset by increases in costs of revenues and operating expenses related primarily to our research and development, sales and marketing activities, and general and administrative expenses, which were primarily related to increases in personnel-related costs, cloud-services related costs and subcontractor costs, and an increase in income tax expense.

● Cash, cash equivalents and short-term investments decreased $24.1 million to $116.1 million at September 30, 2022, from $140.2 million at December 31, 2021, primarily due to cash used to repurchase shares of common stock and payment for taxes related to net share settlement of equity awards, and for the purchase of property and equipment, partially offset by proceeds from the exercise of stock options, proceeds from purchases under our employee stock purchase plans and cash provided by operating activities.

Critical Accounting Policies and Estimates

See Note 1, Basis of Presentation And Summary of Significant Accounting Policies, to our condensed consolidated financial statements in this Quarterly Report on Form 10-Q, for a description of recent accounting pronouncements and accounting changes, including the expected dates of adoption and estimated effects, if any, on our condensed consolidated financial statements, and to “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on March 1, 2022.

There were no material changes during the nine months ended September 30, 2022, to the items that we disclosed as our critical accounting policies and estimates in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2021.

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The following is a brief discussion of the more significant accounting policies and methods that we use.

General

Our discussion and analysis of our financial conditions, results of operations and cash flows are based on our condensed consolidated financial statements, which have been prepared in conformity with accounting principles generally accepted in the United States of America. Our preparation of these condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during the reporting periods. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. The most significant estimates and assumptions relate to revenue recognition, valuation of long-lived assets including goodwill and intangible assets, and the realization of deferred tax assets. Actual amounts may differ from such estimates under different assumptions or conditions.

Revenue Recognition

We derive revenue from two sources: Analytics and Integrated Yield Ramp.

Analytics Revenue

Analytics revenue is derived from the following primary offerings: licenses and services for standalone Software (which consists primarily of Exensio and Cimetrix products), SaaS (which consists primarily of Exensio products), and DFI and CV systems (including Characterization services) that do not include performance incentives based on customers’ yield achievement.

Revenue from standalone software is recognized depending on whether the license is perpetual or time-based. Perpetual (one-time charge) license software is recognized at the time of the inception of the arrangement when control transfers to the customers, if the software license is distinct from the services offered by us. Revenue from post-contract support is recognized over the contract term on a straight-line basis because we are providing (i) support and (ii) unspecified software updates on a when-and-if available basis over the contract term. Revenue from time-based-licensed software is allocated to each performance obligation and is recognized either at a point in time or over time as follows. The license component is recognized at the time when control transfers to customers, with the post-contract support component recognized ratably over the committed term of the contract. For contracts with any combination of licenses, support, and other services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the standalone selling price (“SSP”) attributed to each performance obligation.

Revenue from SaaS arrangements, which allow for the use of a cloud-based software product or service over a contractually determined period of time without taking possession of software, is accounted for as subscriptions and is recognized as revenue ratably, on a straight-line basis, over the subscription period beginning on the date the service is first made available to customers.

Revenue from DFI systems and CV systems (including Characterization services) that do not include performance incentives based on customers’ yield achievement is recognized primarily as services are performed. Where there are distinct performance obligations, we allocate revenue to all deliverables based on their SSPs. For these contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using SSP attributed to each performance obligation. Where there are not discrete performance obligations, historically, revenue is primarily recognized as services are performed using a percentage of completion method based on costs or labor-hours inputs, whichever is the most appropriate measure of the progress towards completion of the contract. The estimation of percentage of completion method is complex and subject to many variables that require significant judgment.

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Integrated Yield Ramp Revenue

Integrated Yield Ramp revenue is derived from our Integrated Yield Ramp engagements that include Gainshare royalties or other performance incentives based on customers’ yield achievement.

Revenue under these project–based contracts, which are delivered over a specific period of time typically for a fixed fee component paid on a set schedule, is recognized as services are performed using a percentage of completion method based on costs or labor-inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Where there are distinct performance obligations, we allocate revenue to all deliverables based on their SSPs and allocate the transaction price of the contract to each performance obligation on a relative basis using SSP. Similar to the services provided in connection with DFI systems and CV systems that are contributing to Analytics revenue, due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex and subject to many variables that require significant judgment.

The Gainshare royalty contained in the Integrated Yield Ramp contracts is a variable fee related to continued usage of our IP after the fixed-fee service period ends, based on the customers’ yield achievement. Revenue derived from Gainshare is contingent upon our customers reaching certain defined production yield levels. Gainshare royalty periods are generally subsequent to the delivery of all contractual services and performance obligations. We record Gainshare as a usage-based royalty derived from customers’ usage of intellectual property and record it in the same period in which the usage occurs.

Income Taxes

We are required to assess whether it is “more-likely-than-not” that we will realize our deferred tax assets. If we believe that they are not likely to be fully realizable before the expiration dates applicable to such assets, then to the extent we believe that recovery is not likely, we must establish a valuation allowance. Based on all available evidence, both positive and negative, we determined a full valuation allowance was still appropriate for our U.S. federal and state net deferred tax assets (“DTAs”), primarily driven by a cumulative loss incurred over the 12-quarter period ended September 30, 2022, and the likelihood that we may not utilize tax attributes before they expire. The valuation allowance was approximately $51.6 million as of September 30, 2022, and December 31, 2021. We will continue to evaluate the need for a valuation allowance and may change our conclusion in a future period based on changes in facts (e.g., 12-quarter cumulative profit, significant new revenue, etc.). If we conclude that we are more likely than not to utilize some or all of our U.S. DTAs, we will release some or all of our valuation allowance and our tax provision will decrease in the period in which we make such determination.

We evaluate our DTAs for realizability considering both positive and negative evidence, including our historical financial performance, projections of future taxable income, future reversals of existing taxable temporary differences, tax planning strategies and any carryback availability. In evaluating the need for a valuation allowance, we estimate future taxable income based on management approved business plans. This process involves significant management judgment about assumptions that are subject to change from period to period based on changes in tax laws or variances between future projected operating performance and actual results. Changes in the net DTAs, less offsetting valuation allowance, in a period are recorded through the income tax provision and could have a material impact on the Condensed Consolidated Statements of Comprehensive Income (Loss).

Our income tax calculations are based on application of applicable U.S. federal, state, or foreign tax law. Our tax filings, however, are subject to audit by the respective tax authorities. Accordingly, we recognize tax liabilities based upon our estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases are recorded as income tax expense or benefit in the Condensed Consolidated Statements of Comprehensive Income (Loss). At September 30, 2022, no deferred taxes have been provided on undistributed earnings from our international subsidiaries. We intend to reinvest the earnings of our non-U.S. subsidiaries in those operations indefinitely. As such, we have not provided for any foreign withholding taxes on the earnings of foreign subsidiaries as of September 30, 2022. The earnings of our foreign subsidiaries are taxable in the U.S. in the year earned under the Global Intangible Low-Taxed Income rules implemented under 2017 Tax Cuts and Jobs Act.

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The Inflation Reduction Act of 2022 (the “Act”) was signed into U.S. law on August 16, 2022. The Act includes various tax provisions, including an excise tax on stock repurchases, expanded tax credits for clean energy incentives, and a corporate alternative minimum tax that generally applies to U.S. corporations with average adjusted financial statement income over a three year period in excess of $1 billion. While the details of the computation of the tax and implementation of the incentives will be subject to regulations that have not yet been released by the U.S. Department of the Treasury, the Company does not expect the Act to materially impact its financial statements.

The Creating Helpful Incentives to Produce Semiconductors Act (the “CHIPS Act”) was signed into U.S. law on August 9, 2022. CHIPS Act is intended to increase domestic competitiveness in semiconductor manufacturing capacity, increase research and development in computing, artificial intelligence, clean energy, and nanotechnology through federal government programs and incentives over the next ten years. CHIPS Act includes an advanced manufacturing tax credit equal to 25% of qualified investments in property purchased for an advanced manufacturing facility. We are evaluating the potential benefits of CHIPS Act to our business.

Valuation of Long-lived Assets including Goodwill and Intangible Assets

We record goodwill when the purchase consideration of an acquisition exceeds the fair value of the net tangible and identified intangible assets as of the date of acquisition. We have one operating segment and one operating unit. We perform an annual impairment assessment of goodwill during the fourth quarter of each calendar year or more frequently, if required to determine if any events or circumstances exist, such as an adverse change in business climate or a decline in the overall industry demand, that would indicate that it would more likely than not reduce the fair value of a reporting unit below its carrying amount, including goodwill. If events or circumstances do not indicate that the fair value of a reporting unit is below its carrying amount, then goodwill is not considered to be impaired and no further testing is required. If the carrying amount exceeds its fair value, an impairment loss would be recognized equal to the amount of excess, limited to the amount of total goodwill. There was no impairment of goodwill for the three and nine months ended September 30, 2022.

Our long-lived assets, excluding goodwill, consist of property, equipment, and intangible assets. We periodically review our long-lived assets for impairment. For assets to be held and used, we initiate our review whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset group may not be recoverable. Recoverability of an asset group is measured by comparison of its carrying amount to the expected future undiscounted cash flows that the asset group is expected to generate. If it is determined that an asset group is not recoverable, an impairment loss is recorded in the amount by which the carrying amount of the asset group exceeds its fair value. There was no impairment of long-lived assets for the three and nine months ended September 30, 2022.

Recent Accounting Pronouncements and Accounting Changes

See Note 1, Basis of Presentation and Summary of Significant Accounting Policies, to our condensed consolidated financial statements in this Quarterly Report on Form 10-Q, for a description of recent accounting pronouncements and accounting changes, including the expected dates of adoption and estimated effects, if any, on our condensed consolidated financial statements.

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Results of Operations

Discussion of Financial Data for the Three and Nine Months ended September 30, 2022

Revenues, Costs of Revenues, and Gross Margin

	Three Months Ended										Nine Months Ended
	September 30,						Change				September 30,						Change
(Dollars in thousands)	2022			2021			$		%		2022			2021			$		%
Revenues:
Analytics	$	32,879		$	27,194		$	5,685	21	%	$	94,422		$	66,165		$	28,257	43	%
Integrated Yield Ramp		6,981			2,361			4,620	196	%		13,604			15,009			(1,405)	(9)	%
Total revenues		39,860			29,555			10,305	35	%		108,026			81,174			26,852	33	%
Costs of revenues		12,545			11,070			1,475	13	%		36,116			32,518			3,598	11	%
Gross profit	$	27,315		$	18,485		$	8,830	48	%	$	71,910		$	48,656		$	23,254	48	%
Gross margin		69	%		63	%						67	%		60	%
Analytics revenue as a percentage of total revenues		82	%		92	%						87	%		82	%
Integrated Yield Ramp revenue as a percentage of total revenues		18	%		8	%						13	%		18	%

Analytics Revenue

Analytics revenue increased $5.7 million for the three months ended September 30, 2022, compared to the three months ended September 30, 2021. The increase in Analytics revenue was primarily driven by increases in revenues from CV systems and DFI systems across multiple contracts and customers, and increases in revenues from Cimetrix and Exensio software licenses.

Analytics revenue increased $28.3 million for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021. The increase in Analytics revenue was primarily driven by increases in revenues from CV systems and DFI systems across multiple contracts and customers, and increases in revenues from Cimetrix and Exensio software licenses.

Integrated Yield Ramp Revenue

Integrated Yield Ramp revenue increased $4.6 million for the three months ended September 30, 2022, compared to the prior year period, primarily due to an increase in Gainshare royalty from increased customer wafer shipments at non-leading edge nodes and hours worked on fixed fee engagements.

Integrated Yield Ramp revenue decreased $1.4 million for the nine months ended September 30, 2022, compared to the prior year period, due to the end of Gainshare periods, partially offset by an increase in hours worked on fixed fees engagements.

Our Integrated Yield Ramp revenue may continue to fluctuate from period to period primarily due to the contribution of Gainshare royalty, which is dependent on many factors that are outside our control, including among others, continued production of ICs by our customers at facilities at which we generate Gainshare, sustained yield improvements by our customers, and our ability to enter into new contracts containing Gainshare.

Our Analytics and Integrated Yield Ramp revenues may fluctuate in the future and are dependent on a number of factors, including the semiconductor industry’s continued acceptance of our products, services and solutions, the timing of purchases by existing and new customers, cancellations by existing customers, and our ability to attract new customers and penetrate

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new markets, and further penetration of our current customer base. Fluctuations in future results may also occur if any of our significant customers renegotiate pre-existing contractual commitments, including due to adverse changes in their own business.

Costs of Revenues

Costs of revenues consist primarily of costs incurred to provide and support our services, costs recognized in connection with licensing our software, and amortization of acquired technology. Service costs include material, personnel-related costs and related benefits including stock-based compensation expense, subcontractor costs, overhead costs, travel and allocated facilities-related costs. Software license costs consist of costs associated with cloud-delivery related expenses and licensing third-party software used by us in providing services to our customers in solution engagements or sold in conjunction with our software products.

The increase in costs of revenues of $1.5 million for the three months ended September 30, 2022, compared to the three months ended September 30, 2021, was primarily due to (i) a $0.9 million increase in personnel-related costs due to worldwide merit increases, increases in benefit costs, stock-based compensation expense, and bonus expense, (ii) a $0.4 million increase in cloud-delivery costs, and (iii) a $0.2 million increase in subcontractor costs. These were partially offset by a $0.2 million decrease in facilities and information technology-related costs including depreciation expense.

The increase in costs of revenues of $3.6 million for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021, was primarily due to (i) a $2.6 million increase in personnel-related costs due to worldwide merit increases, increases in benefit costs, stock-based compensation expense, and bonus expense, (ii) a $1.2 million increase in cloud-delivery costs, and (iii) a $0.6 million increase in subcontractor costs. These were partially offset by (i) a $0.7 million decrease in facilities and information technology-related costs including depreciation expense and (ii) a $0.1 million decrease in software royalties and license expenses.

Gross Margin

Gross margin increased 6 percentage points for the three months ended September 30, 2022, to 69%, compared to 63% for the three months ended September 30, 2021. The higher gross margin during the three months ended September 30, 2022 was primarily due to higher total revenue when compared to the year-ago period.

Gross margin increased 7 percentage points for the nine months ended September 30, 2022, to 67%, compared to 60% for the nine months ended September 30, 2021. The higher gross margin during the nine months ended September 30, 2022 was primarily due to higher total revenue and decreases in certain costs of revenues, as discussed above, which decreased the costs of revenues as a percentage of total revenues, when compared to the year-ago period.

Operating Expenses:

Research and Development

	Three Months Ended										Nine Months Ended
	September 30,						Change				September 30,						Change
(Dollars in thousands)	2022			2021			$		%		2022			2021			$		%
Research and development	$	14,303		$	10,657		$	3,646	34	%	$	41,766		$	32,562		$	9,204	28	%
As a percentage of total revenues		36	%		36	%						39	%		40	%

Research and development expenses consist primarily of personnel-related costs including compensation, benefits and stock-based compensation expense, outside development services, third-party cloud-services related cost, travel, and facilities cost allocations, to support product development activities.

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Research and development expenses increased for the three months ended September 30, 2022, compared to the three months ended September 30, 2021, primarily due to (i) a $2.7 million increase in personnel-related costs primarily resulting from increases in stock-based compensation expense, headcount, bonus expense, benefit costs, and worldwide merit increases, (ii) a $0.6 million increase in subcontractor expenses primarily related to DFI systems and Cimetrix software, (iii) a $0.1 million increase in facilities and information technology-related costs including depreciation expense, and (iv) a $0.1 million increase in travel expenses.

Research and development expenses increased for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021, primarily due to (i) a $7.3 million increase in personnel-related costs primarily resulting from increases in stock-based compensation expense, headcount, bonus expense, benefit costs, and worldwide merit increases, (ii) a $1.1 million increase in subcontractor expenses primarily related to CV systems and Exensio and Cimetrix software, and (iii) a $0.5 million increase in facilities and information technology-related costs including depreciation expense, and (iv) a $0.3 million increase in travel expense.

We anticipate our expenses in research and development will fluctuate in absolute dollars from period to period as a result of the size and the timing of product development projects.

Selling, General, and Administrative

	Three Months Ended										Nine Months Ended
	September 30,						Change				September 30,						Change
(Dollars in thousands)	2022			2021			$		%		2022			2021			$		%
Selling, general and administrative	$	12,005		$	9,609		$	2,396	25	%	$	32,614		$	28,482		$	4,132	15	%
As a percentage of total revenues		30	%		33	%						30	%		35	%

Selling, general, and administrative expenses consist primarily of compensation, benefits and stock-based compensation expense for sales, marketing and general and administrative personnel, legal and accounting services, marketing communications expenses, third-party cloud-services related costs, travel and facilities cost allocations.

Selling, general, and administrative expenses increased for the three months ended September 30, 2022, compared to the three months ended September 30, 2021, primarily due to (i) a $2.2 million increase in personnel-related costs mainly resulting from increases in stock-based compensation expense, headcount, bonus and commission expenses, benefit costs, and worldwide merit increases, (ii) a $0.2 million increase in facilities and information technology-related costs, including third-party cloud-services related costs, (iii) a $0.3 million increase in travel and other expenses, and (iv) a $0.2 million increase in legal fees related to the arbitration proceeding over a disputed customer contract. These were partially offset by a $0.5 million decrease in subcontractor expenses.

Selling, general, and administrative expenses increased for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021, primarily due to (i) a $4.0 million increase in personnel-related costs mainly resulting from increases in stock-based compensation expense, headcount, bonus and commission expense, benefit costs, and worldwide merit increases, (ii) a $0.4 million increase in facilities and information technology-related costs including depreciation expense, (iii) a $0.4 million increase in third-party cloud-services related costs, and (iv) a $0.2 million increase in travel expenses. These were partially offset by a (i) a $0.7 million decrease in subcontractor expenses, and (ii) a $0.2 million decrease in legal fees related to the arbitration proceeding over a disputed customer contract.

We anticipate our selling, general, and administrative expenses will fluctuate in absolute dollars from period to period as a result of cost control initiatives and to support increased selling efforts in the future.

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Amortization of Other Acquired Intangible Assets

	Three Months Ended								Nine Months Ended
	September 30,				Change				September 30,				Change
(Dollars in thousands)	2022		2021		$		%		2022		2021		$		%
Amortization of acquired intangible assets	$	318	$	314	$	4	1	%	$	946	$	942	$	4	0	%

Amortization of other acquired intangible assets primarily consists of amortization of intangibles acquired as a result of certain business combinations.

Interest and Other Expense (Income), Net

	Three Months Ended								Nine Months Ended
	September 30,				Change				September 30,				Change
(Dollars in thousands)	2022		2021		$		%		2022		2021		$		%
Interest and other expense (income), net	$	(1,511)	$	(194)	$	(1,317)	679	%	$	(2,812)	$	(391)	$	(2,421)	619	%

Interest and other expense (income), net, primarily consists of interest income, and foreign currency transaction exchange gains and losses.

Interest and other expense (income), net increased for the three and nine months ended September 30, 2022, compared to the year-ago periods, primarily due to a higher foreign currency exchange gain resulting from a net favorable fluctuation in foreign exchange rates and interest income.

Income Tax Expense

	Three Months Ended								Nine Months Ended
	September 30,				Change				September 30,				Change
(Dollars in thousands)	2022		2021		$		%		2022		2021		$		%
Income tax expense	$	815	$	506	$	309	61	%	$	3,308	$	1,549	$	1,759	114	%

Income tax expense increased for the three and nine months ended September 30, 2022, compared to the three and nine months ended September 30, 2021, primarily due to increases in foreign withholding taxes and changes in the geographic mix of worldwide income, which is subject to taxation at different statutory tax rates.

Any significant change in our future effective tax rates could adversely impact our consolidated financial position, results of operations and cash flows. Our future tax rates may be adversely affected by a number of factors including increase in expenses not deductible for tax purposes, tax legislations in the United States and in foreign countries where we are subject to tax jurisdictions, the geographic composition of our pre-tax income, the amount of our pre-tax income as business activities fluctuate, our ability to use tax attributes such as research and development tax credits and net operation losses, the tax effects of employee stock activity, audit examinations with adverse outcomes, changes in generally accepted accounting principles and the effectiveness of our tax planning strategies.

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Liquidity and Capital Resources

As of September 30, 2022, our working capital, defined as total current assets less total current liabilities, was $128.1 million, compared to $144.7 million as of December 31, 2021. Total cash and cash equivalents, and short-term investments were $116.1 million as of September 30, 2022, compared to cash and cash equivalents of $140.2 million as of December 31, 2021. As of September 30, 2022, and December 31, 2021, cash and cash equivalents held by our foreign subsidiaries were $6.9 million and $5.3 million, respectively. We believe that our existing cash resources and anticipated funds from operations will satisfy our cash requirements to fund our operating activities, capital expenditures, other obligations for at least the next twelve months.

There has been no significant impact in respect to Liquidity and Capital Resources from the global COVID-19 pandemic.   For risk discussion about the continuing impact of global COVID-19 pandemic on our operations or demand for our products, refer to Part I, Item 1A, “Risk Factors” of our Annual Report for the year ended December 31, 2021, filed with the SEC on March 1, 2022.

Repurchase of Company’s Common Stock

On June 4, 2020, the Company’s Board of Directors adopted a stock repurchase program (the “2020 Program”) to repurchase up to $25.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, including through Rule 10b5-1 plans, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 218,858 shares under the 2020 Program at an average price of $26.40 per share, for a total price of $5.8 million. Through April 10, 2022, under the 2020 Program, the Company repurchased a total of 470,070 shares at an average price of $21.91 per share, for a total price of $10.3 million. On April 11, 2022, the Board of Directors terminated the 2020 stock repurchase program, and adopted a new program (the “2022 Program”) to repurchase up to $35.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, from time to time, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 714,600 shares under the 2022 Program at an average price of $23.36 per share, for a total price of $16.7 million.

Cash Flow Data

The following table summarizes our cash flows for the periods presented:

	Nine Months Ended September 30,
	2022		2021		$ Change
(In thousands)
Net cash flows provided by (used in):
Operating activities	$	8,023	$	3,827	$	4,196
Investing activities		83,354		42,302		41,052
Financing activities		(24,186)		(5,494)		(18,692)
Effect of exchange rate changes on cash and cash equivalents		(1,147)		(193)		(954)
Net increase in cash, cash equivalents, and restricted cash	$	66,044	$	40,442	$	25,602

Net Cash Flows Provided by Operating Activities

Cash flows provided by operating activities during the nine months ended September 30, 2022, consisted of net loss, adjusted for certain non-cash items which primarily consisted of depreciation and amortization, stock-based compensation expense, amortization of acquired intangible expense, amortization of costs capitalized to obtain revenue contracts and net change in operating assets and liabilities. The $4.2 million increase in cash flows from operating activities for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021, was driven primarily by a $10.6 million decrease in net loss, a $11.4 million decrease in net change from operating assets and liabilities, and a $5.0 million increase in non-cash adjustments to net loss, which mainly resulted from an increase in stock-based compensation expense of $5.1

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million and an increase in amortization of costs capitalized to obtain revenue contracts of $0.6 million, partially offset by a decrease in depreciation and amortization of $0.6 million.

The major contributors to the net change in operating assets and liabilities for the nine months ended September 30, 2022, were as follows:

● Accounts receivable increased by $15.0 million, primarily due to contractual invoicing activity partially offset by collections from customers;

● Prepaid expense and other current assets increased by $2.8 million, primarily due to the timing of billing of contract assets related to fixed-price service contracts, and increase in deferred commission expense, partially offset by a decrease in prepaid expenses related to third party software licenses and cloud-subscription related costs and a decrease in income tax receivable;

● Other non-current assets decreased by $1.5 million primarily due to the amortization of non-current prepaid expenses, deferred costs to obtain contracts with customers and lower unbilled accounts receivable;

● Accounts payable decreased by $2.9 million primarily due to the timing of payments of vendor invoices;

● Accrued and other liabilities increased by $2.6 million primarily due to the timing of vendor invoices and accrued income taxes;

● Accrued compensation and related benefits increased by $3.6 million primarily due to accrued bonuses, unused vacation, and accrued sales commissions, partially offset by a decrease in accrual due to exercise of purchase rights under employee stock purchase plans; and

● Deferred revenue increased by $2.3 million, primarily due to the timing of billing and revenue recognition.

Net Cash Flows Provided by Investing Activities

Cash provided by investing activities increased by $41.1 million for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021.

For the nine months ended September 30, 2022, cash provided by investing activities primarily related to proceeds from maturities and sales of short-term investments of $136.0 million, partially offset by purchases of short-term investments of $45.8 million, and purchases of and prepayments for property and equipment of $6.7 million primarily related to our DFI systems and CV systems.

For the nine months ended September 30, 2021, cash provided by investing activities primarily related to proceeds from maturities and sales of short-term investments of $136.0 million, offset by purchases of short-term investments of $91.0 million and property and equipment of $2.7 million primarily related to our DFI systems. 

Net Cash Flows Used in Financing Activities

Net cash used in financing activities increased by $18.7 million for the nine months ended September 30, 2022, compared to the nine months ended September 30, 2021. 

For the nine months ended September 30, 2022, net cash used in financing activities primarily consisted of $22.5 million for the repurchase of shares of our common stock and $5.8 million in cash payments for taxes related to net share settlement of equity awards, partially offset by $4.1 million of proceeds from our employee stock purchase plans and exercise of stock options.

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For the nine months ended September 30, 2021, net cash used in financing activities primarily consisted of $4.5 million for the repurchase of shares of our common stock and $3.3 million in cash payments for taxes related to net share settlement of equity awards, partially offset by $2.3 million of proceeds from our employee stock purchase plan and exercise of stock options.

Related Party Transactions

Refer to Note 3, Strategic Partnership Agreement with Advantest and Related Party Transactions, to our condensed consolidated financial statements in this Quarterly Report on Form 10-Q, for a discussion on related party transactions between the Company and Advantest.

Off-Balance Sheet Agreements

We do not have any off-balance sheet arrangements, investments in special purpose entities or undisclosed borrowings or debt.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

We are exposed to three primary types of market risks: credit risk and counterparty risk, foreign currency exchange rate risk and interest rate risk. The following discusses our exposure to market risk related to changes in interest rates and foreign currency exchange rates. We do not currently own any equity investments, nor do we expect to own any in the foreseeable future. This discussion contains forward-looking statements that are subject to risks and uncertainties. Actual results could vary materially as a result of a number of factors.

Interest Rate Risk.  As of September 30, 2022, we had cash and cash equivalents and short-term investments of $116.1 million. Cash and cash equivalents consisted of cash and highly liquid money market instruments and short-term investments consisted of U.S. Government securities. We would not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest on our portfolio. A hypothetical increase in market interest rates of 100 basis points from the market rates in effect at September 30, 2022, would cause the fair value of these investments to decrease by an immaterial amount which would not have significantly impacted our financial position or results of operations.

At September 30, 2022 and periodically throughout the year, we have maintained cash balances in various operating accounts in excess of federally insured limits. We limit the amount of credit exposure to any financial institution by evaluating the creditworthiness of the financial institutions with which we invest and investing through more than one financial institution.

Foreign Currency and Exchange Risk.  Certain of our receivables and payables for our international offices are denominated in the local currency, including the Euro, Yen and RMB. Therefore, a portion of our revenues and operating expenditures are subject to foreign currency risks. From time to time, we enter into foreign currency forward contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. We do not use foreign currency forward contracts for speculative or trading purposes. We record these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a financial institution that we believe is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. As of September 30, 2022, we had no outstanding forward contracts.

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Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial and accounting officer, evaluated the effectiveness of our “disclosure controls and procedures” as defined in Exchange Act Rules 13a-15(e) and 15d-15(e) as of September 30, 2022, in connection with the filing of this Quarterly Report on Form 10-Q. Based on that evaluation as of September 30, 2022, our principal executive officer and principal financial and accounting officer concluded that our disclosure controls and procedures were effective to ensure that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in rules and forms of the SEC and accumulated and communicated to our management as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting during the three months ended September 30, 2022, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II — OTHER INFORMATION

Item 1. Legal Proceedings

Refer to Note 12, Commitments and Contingencies to our condensed consolidated financial statements in this Quarterly Report on Form 10-Q, for information regarding our legal proceedings.

Item 1A. Risk Factors

As of the date of this Quarterly Report on Form 10-Q, there have been no material changes from the risk factors disclosed in Part I, Item 1A, “Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on March 1, 2022, except as set forth immediately below.

We are subject to governmental export and import requirements that could subject us to liability and restrict our ability to sell our products and services, which could impair our ability to compete in international markets.

We are subject to export controls and economic sanctions laws and regulations that restrict selling, shipping or transmitting our products and services and transferring our technology outside the United States. These requirements also restrict domestic release of software and technology to foreign nationals. In addition, we are subject to customs and other import requirements that regulate imports that are important for our business. If we fail to comply with the U.S. Export Administration Regulations or other U.S. or non-U.S. export requirements (collectively, the “Export Regulations”), we could be subject to substantial civil and criminal penalties, including fines for the Company and the possible loss of the ability to engage in exporting and other international transactions. Due to the nature of our business and technology, the Export Regulations may also subject us to governmental inquiries regarding transactions between us and certain foreign entities.

We believe that current Export Regulations do not materially impact our business at this time, but we cannot predict the impact that additional regulatory changes may have on our business in the future. The Export Regulations are fluid. For example, in October 2022 the U.S. Bureau of Industry and Security (the “BIS”) promulgated broad, novel restrictions that could cover supply of our products and other aspects of our business in connection with China. Also, BIS has placed certain entities on its entity list (the “Entity List”), which restricts supply of items to or in connection with the named entities. Further, in some circumstances the Export Administration Regulations require a license to export an item if the recipient will use the item to design or produce an item for a Huawei-affiliated company or certain other organizations on the Entity List. These regulations can also require licenses for exports that involve Chinese military or intelligence-related end users or end uses.

40

Future changes in the Export Regulations, including changes in the enforcement and scope of such regulations, may create delays in the introduction of our products or services in international markets or could prevent our customers with international operations from deploying our products or services globally. In some cases, such changes could prevent the export or import of our products or services to certain countries, governments or persons altogether. Any such delays or restrictions could adversely affect our business, financial condition and results of operations.

We are exposed to risks related to information technology infrastructure, information management and protection, cybersecurity threats, and cyber incidents.

We are heavily reliant on our technology and infrastructure, as well as the public cloud to an increasing degree, to provide our products and services to our customers. Additionally, we must frequently expand our internal information system to meet increasing demand in storage, computing and communication, which may result in increased costs. Our internal information system is expensive to expand and must be highly secure due to the sensitive nature of our customers’ information that we transmit. Building and managing the support necessary for our growth places significant demands on our management and resources. These demands may divert these resources from the continued growth of our business and implementation of our business strategy.

We have experienced in the past, and may experience in the future, interruptions in our information systems on which our global operations depend. We may in the future experience unplanned downtime of the infrastructure that delivers our SaaS products. Further, we may face attempts by others to gain unauthorized access through the Internet to our information technology systems whether hosted by us or service providers, to intentionally hack, interfere with, or cause physical or digital damage to or failure of such systems (such as significant viruses or worms), which attempts we or they may be unable to prevent. Our security measures may also be breached due to employee errors, malfeasance, or otherwise. Further, territorial invasions like Russia’s invasion of Ukraine can lead to cybersecurity attacks on technology companies, such as ours, located far outside of the conflict zone. In the event of prolonged business interruptions due to geopolitical events, we could incur significant losses, require substantial recovery time and experience significant expenditures in order to resume our business operations.

In addition, we collect, use, store or disclose (collectively, “process”) an increasingly large amount of personal information, including from employees and customers, in connection with the operation of our business. The personal information we process is subject to an increasing number of federal, state, local and foreign laws regarding privacy and data security, as well as contractual commitments. Any failure or perceived failure by us to comply with such obligations may result in governmental enforcement actions, fines, litigation, or public statements against us by consumer advocacy groups or others and could cause our customers to lose trust in us, which could have an adverse effect on our reputation and business. Additionally, changes to applicable privacy or data security laws could impact how we process personal information, and therefore limit the effectiveness of our solutions or our ability to develop or deliver new products or services. For example, the European Union General Data Protection Regulation imposes stringent data protection requirements and provides for significant penalties for noncompliance of up to the greater of €20 million or four percent of worldwide annual revenues. Regulation is also increasingly occurring at the U.S. state level to supplement federal legislative action or inaction, as indicated by the California Consumer Privacy Act (the “CCPA”), which first became enforceable in 2020, and similar statutes that have been adopted in other states.

41

Despite our on-going efforts to enhance our network security measures, our information systems are susceptible to computer viruses, cyber-related security breaches and similar disruptions from unauthorized intrusions, tampering, misuse, criminal acts including phishing, or other events or developments that we may be unable to anticipate or fail to mitigate and we are subject to the inherent vulnerabilities of network security measures. For example, in the middle of 2020, we became aware that a malicious third-party actor had fraudulently obtained one-time credentials to a limited set of hosts in a small, segregated part of our network due to a vulnerability in a third-party VPN device. Third parties may also attempt to influence employees, users, suppliers or customers to disclose sensitive information in order to gain access to our, our customers’ or our business partners’ data. Additionally, third parties with whom we work, such as vendors or developers, may violate applicable laws or our policies and such violations can place personal information of our customers at risk. We or our service providers could be unaware of an incident or its magnitude and effects until after it is too late to prevent it and the damage it may cause. Further, because the techniques used to obtain unauthorized access to the information systems change frequently, and may not be recognized until launched against a target, we may be unable to anticipate these techniques or to implement adequate preventative measures.

The theft, unauthorized use, or a cybersecurity attack that results in the publication of our trade secrets and other confidential business information as a result of such an incident could negatively affect our competitive position, the value of our investment in product or research and development, and third parties might assert against us or our customers claims related to such losses of confidential or proprietary information or end-user data and/or system reliability. We carry insurance that provides some protection against the potential losses arising from a cybersecurity incident, but it will likely not cover all such losses, and the losses it does not cover may be significant. In any such event, our business could be subject to significant disruption, which could impact our revenues or cause customers to cease doing business with us, and we could suffer monetary and/or other losses, including reputational harm, which costs we may not be able to recover from our service providers. Our operations are dependent upon our ability to protect our technology infrastructure against damage from business continuity events that could have a significant disruptive effect on our operations.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

There were no stock repurchases during the third quarter of 2022.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

INDEX TO EXHIBITS

42

Item 6. Exhibits

Exhibit Number	Description
10.01	Amendment #1 to Amendment #1 to SLA, dated June 5, 2022, by and between PDF Solutions, Inc. and Advantest America, Inc.†
31.01	Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†
31.02	Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.†
32.01	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**
32.02	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.**
101	The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022, formatted in Inline XBRL: (i) Condensed Consolidated Balance Sheets, (ii) Condensed Consolidated Statements of Comprehensive Income (Loss), (iii) Condensed Consolidated Statements of Stockholders’ Equity, (iv) Condensed Consolidated Statements of Cash Flows and (v) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and including detailed tags.†
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).†

† Filed herewith.

** Furnished, and not filed.

43

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.

	PDF SOLUTIONS, INC.
Date: November 10, 2022	By:	/s/ JOHN K. KIBARIAN
		John K. Kibarian
		President and Chief Executive Officer
		(principal executive officer)
Date: November 10, 2022	By:	/s/ ADNAN RAZA
		Adnan Raza
		Executive Vice President, Finance and Chief
		Financial Officer
		(principal financial and accounting officer)

44

EX-10.1

Exhibit 10.01

CERTAIN INFORMATION INDICATED WITH [***] IN THIS DOCUMENT HAS BEEN OMITTED

FROM THIS EXHIBIT BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD BE

COMPETITIVELY HARMFUL IF PUBLICLY DISCLOSED

	PDF doc #10285
Amendment #1 to Amendment #1 to SLA

THIS AMENDMENT #1 TO AMENDMENT #1 TO SLA (the “Amendment”) is effective as of the date of the last signature hereon (the “Effective Date”) and is entered into by and between:

PDF Solutions, Inc. (“PDF”), a corporation headquartered at 2858 De La Cruz Boulevard, Santa Clara, CA 95050; and,

Advantest America, Inc. (“Licensee”), a company headquartered at 3061 Zanker Road, San Jose, CA 95134.

WHEREAS the Parties have previously entered into that certain Software License & Related Services Agreement (PDF doc #8116), dated as of March 25, 2020 (as amended, the “Agreement”), which provides general terms and conditions for the license of PDF Software and provision of related Services to Licensee;

WHEREAS the Parties now wish to add a DEX Site to the Approved List of DEX Sites and Dedicated Developers as set forth herein;

NOW, THEREFORE, in consideration of the mutual promises contained herein, the Parties hereby agree as follows:

1. A1 Appendix E: Approved List (DEX Sites and Dedicated Developers) is, provided that *** first enters into PDF’s standard form DEX Instance Letter Agreement with PDF, hereby amended and restated in its entirety as follows:

DEX Sites
Name	3rd party?	Location (Country)
***	***	***
***	***	***

2. Misc. This Amendment incorporates by this reference the terms and conditions of the Agreement, which together with the additional and/or changed terms contained constitute the Parties’ complete agreement with respect to the subject matter hereof. Capitalized terms used in this Amendment and the attachments hereto that are not otherwise defined herein or therein shall have the meanings specified in the Agreement. All notices provided or required hereunder must be in writing, for which email to the address specified in the signature block for each Party below is sufficient. Except for as expressly set forth herein, the terms and conditions of the Agreement remains unchanged. This Amendment may be executed by electronic/digital signature, fax copies, or scanned copies (images exchanged via electronic mail) in counterparts, each of which shall be deemed an original, but all of which together will constitute one and the same instrument. In case of discrepancy between the terms and provisions of the Agreement and those of this Amendment the terms and provisions of this Amendment shall prevail, including those provisions of this Amendment which specifically amend the Agreement.

[Signatures follow on the next page.]

Page 1 of 2

PDF Solutions, Inc. CONFIDENTIAL INFORMATION

PDF doc #10285 (continued)

WHEREUPON, the Parties have caused their duly authorized representatives to execute this Amendment as of the Effective Date.

PDF SOLUTIONS, INC.				ADVANTEST AMERICA, INC.
2858 De La Cruz Boulevard				3061 Zanker Road
Santa Clara, CA 95050 (USA)				San Jose, CA 95134
(408) 280-7900				(408) 456-3600
legal.department@pdf.com				Email: Teresa.Reid@advantest.com
By:	/s/ Adnan Raza			By:	/s/ Douglas Lefever
Printed Name:			Adnan Raza	Printed Name:			Douglas Lefever
Title:		EVP, Fin. & CFO		Title:		President & CEO
Date:		2022/06/03		Date:		2022/06/05

Page 2 of 2

PDF Solutions, Inc. CONFIDENTIAL INFORMATION

EX-31.1

Exhibit 31.01

CERTIFICATIONS

I, John K. Kibarian, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.;

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

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

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

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

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

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

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

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

	By:	/s/ John K. Kibarian
		John K. Kibarian
		President and Chief Executive Officer
		(principal executive officer)
Date: November 10, 2022

EX-31.2

Exhibit 31.02

CERTIFICATIONS

I, Adnan Raza, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.;

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

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

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

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

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

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

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

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

	By:	/s/ Adnan Raza
		Adnan Raza
		Executive Vice President, Finance
		and Chief Financial Officer
		(principal financial and accounting
		officer)
Date: November 10, 2022

EX-32.1

Exhibit 32.01

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 PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2022, as filed with the Securities and Exchange Commission on November 10, 2022 (the “Report”), I, John K. Kibarian, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 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 result of operations of the Company.

	By:	/s/ John K. Kibarian
		John K. Kibarian
		President and Chief Executive
		Officer
		(principal executive officer)
Date: November 10, 2022

EX-32.2

Exhibit 32.02

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 PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2022, as filed with the Securities and Exchange Commission on November 10, 2022 (the “Report”), I, Adnan Raza, Executive Vice President, Finance and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 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 result of operations of the Company.

10
	By:	/s/ Adnan Raza
		Adnan Raza
		Executive Vice President, Finance
		and Chief Financial Officer
		(principal financial and accounting
		officer)
Date: November 10, 2022

XML

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 04, 2022
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	000-31311
Entity Registrant Name	PDF SOLUTIONS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1701361
Entity Address, Address Line One	2858 De La Cruz Blvd.
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95050
City Area Code	408
Local Phone Number	280-7900
Title of 12(b) Security	Common Stock, $0.00015 par value
Trading Symbol	PDFS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		37,382,927
Entity Central Index Key	0001120914
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2022

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 93,728	$ 27,684
Short-term investments	22,357	112,542
Accounts receivable, net of allowance for doubtful accounts of $890 as of September 30, 2022 and December 31, 2021	54,981	40,087
Prepaid expenses and other current assets	9,463	8,194
Total current assets	180,529	188,507
Property and equipment, net	38,740	35,295
Operating lease right-of-use assets, net	6,022	5,408
Goodwill	14,123	14,123
Intangible assets, net	18,934	21,239
Deferred tax assets, net	16	75
Other non-current assets	7,611	9,121
Total assets	265,975	273,768
Current liabilities:
Accounts payable	5,186	5,554
Accrued compensation and related benefits	12,652	9,495
Accrued and other current liabilities	6,472	3,328
Operating lease liabilities - current portion	1,448	1,758
Deferred revenues - current portion	26,461	23,691
Billings in excess of recognized revenues	183
Total current liabilities	52,402	43,826
Long-term income taxes payable	2,348	2,656
Non-current operating lease liabilities	6,074	5,258
Non-current portion of deferred revenue	1,948	2,443
Total liabilities	62,772	54,183
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding
Common stock, $0.00015 par value, 70,000 shares authorized; shares issued 48,448 and 47,414, respectively; shares outstanding 37,295 and 37,411, respectively	6	6
Additional paid-in-capital	441,705	423,069
Treasury stock at cost, 11,153 and 10,003 shares, respectively	(132,966)	(104,705)
Accumulated deficit	(101,633)	(97,721)
Accumulated other comprehensive loss	(3,909)	(1,064)
Total stockholders' equity	203,203	219,585
Total liabilities and stockholders' equity	$ 265,975	$ 273,768

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts	$ 890	$ 890
Preferred stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Preferred stock, shares authorized (in shares)	5,000	5,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Common stock, shares authorized (in shares)	70,000	70,000
Common stock, shares issued (in shares)	48,448	47,414
Common stock, shares outstanding (in shares)	37,295	37,411
Treasury stock, shares (in shares)	11,153	10,003

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Revenues	$ 39,860	$ 29,555	$ 108,026	$ 81,174
Costs and Expenses:
Costs of revenues	12,545	11,070	36,116	32,518
Research and development	14,303	10,657	41,766	32,562
Selling, general and administrative	12,005	9,609	32,614	28,482
Amortization of acquired intangible assets	318	314	946	942
Interest and other expense (income), net	(1,511)	(194)	(2,812)	(391)
Income (loss) before income taxes	2,200	(1,901)	(604)	(12,939)
Income tax expense	815	506	3,308	1,549
Net income (loss)	1,385	(2,407)	(3,912)	(14,488)
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	(1,394)	(226)	(2,828)	(540)
Change in unrealized gain (loss) related to available-for-sale debt securities, net of tax	17	1	(17)	(3)
Total other comprehensive loss	(1,377)	(225)	(2,845)	(543)
Comprehensive income (loss)	$ 8	$ (2,632)	$ (6,757)	$ (15,031)
Net income (loss) per share, basic (in dollars per share)	$ 0.04	$ (0.06)	$ (0.10)	$ (0.39)
Net income (loss) per share, diluted (in dollars per share)	$ 0.04	$ (0.06)	$ (0.10)	$ (0.39)
Weighted average common shares used to calculate net income (loss) per share, basic (in shares)	37,226	37,221	37,285	37,067
Weighted average common shares used to calculate net income (loss) per share, diluted (in shares)	38,054	37,221	37,285	37,067
Analytics
Revenues:
Revenues	$ 32,879	$ 27,194	$ 94,422	$ 66,165
Integrated Yield Ramp
Revenues:
Revenues	$ 6,981	$ 2,361	$ 13,604	$ 15,009

XML

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock Outstanding	Additional Paid-in Capital	Treasury Stock	Retained Earnings	AOCI Attributable to Parent	Total
Balances (in shares) at Dec. 31, 2020	36,850		9,550
Balances at Dec. 31, 2020	$ 6	$ 407,173	$ (96,215)	$ (76,233)	$ (225)	$ 234,506
Issuance of common stock in connection with employee stock purchase plan (in shares)	100
Issuance of common stock in connection with employee stock purchase plan		921				921
Issuance of common stock in connection with exercise of options (in shares)	81
Issuance of common stock in connection with exercise of options		568				568
Vesting of restricted stock units (in shares)	149
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			73
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (1,463)			(1,463)
Repurchase of common stock (in shares)	(251)		251
Repurchase of common stock			$ (4,523)			(4,523)
Stock-based compensation expense		3,369				3,369
Comprehensive income (loss)				(7,597)	(528)	(8,125)
Balances (in shares) at Mar. 31, 2021	36,929		9,874
Balances at Mar. 31, 2021	$ 6	412,031	$ (102,201)	(83,830)	(753)	225,253
Balances (in shares) at Dec. 31, 2020	36,850		9,550
Balances at Dec. 31, 2020	$ 6	407,173	$ (96,215)	(76,233)	(225)	234,506
Comprehensive income (loss)						(15,031)
Balances (in shares) at Sep. 30, 2021	37,274		9,974
Balances at Sep. 30, 2021	$ 6	418,933	$ (103,995)	(90,721)	(768)	223,455
Balances (in shares) at Mar. 31, 2021	36,929		9,874
Balances at Mar. 31, 2021	$ 6	412,031	$ (102,201)	(83,830)	(753)	225,253
Issuance of common stock in connection with exercise of options (in shares)	39
Issuance of common stock in connection with exercise of options		290				290
Vesting of restricted stock units (in shares)	118
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			51
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (887)			(887)
Stock-based compensation expense		2,742				2,742
Comprehensive income (loss)				(4,484)	210	(4,274)
Balances (in shares) at Jun. 30, 2021	37,086		9,925
Balances at Jun. 30, 2021	$ 6	415,063	$ (103,088)	(88,314)	(543)	223,124
Issuance of common stock in connection with employee stock purchase plan	$ 9	114				114
Issuance of common stock in connection with exercise of options (in shares)	40
Issuance of common stock in connection with exercise of options		393				393
Vesting of restricted stock units (in shares)	139
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			49
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (907)			(907)
Stock-based compensation expense		3,363				3,363
Comprehensive income (loss)				(2,407)	(225)	(2,632)
Balances (in shares) at Sep. 30, 2021	37,274		9,974
Balances at Sep. 30, 2021	$ 6	418,933	$ (103,995)	(90,721)	(768)	223,455
Balances (in shares) at Dec. 31, 2021	37,411		10,003
Balances at Dec. 31, 2021	$ 6	423,069	$ (104,705)	(97,721)	(1,064)	219,585
Issuance of common stock in connection with employee stock purchase plan (in shares)	95
Issuance of common stock in connection with employee stock purchase plan		1,502				1,502
Issuance of common stock in connection with exercise of options (in shares)	75
Issuance of common stock in connection with exercise of options		675				675
Vesting of restricted stock units (in shares)	232
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			113
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (3,389)			(3,389)
Repurchase of common stock (in shares)	(219)		219
Repurchase of common stock			$ (5,778)			(5,778)
Stock-based compensation expense		5,553				5,553
Comprehensive income (loss)				(4,150)	(431)	(4,581)
Balances (in shares) at Mar. 31, 2022	37,594		10,335
Balances at Mar. 31, 2022	$ 6	430,799	$ (113,872)	(101,871)	(1,495)	213,567
Balances (in shares) at Dec. 31, 2021	37,411		10,003
Balances at Dec. 31, 2021	$ 6	423,069	$ (104,705)	(97,721)	(1,064)	$ 219,585
Issuance of common stock in connection with exercise of options (in shares)						109
Comprehensive income (loss)						$ (6,757)
Balances (in shares) at Sep. 30, 2022	37,295		11,153
Balances at Sep. 30, 2022	$ 6	441,705	$ (132,966)	(101,633)	(3,909)	203,203
Balances (in shares) at Mar. 31, 2022	37,594		10,335
Balances at Mar. 31, 2022	$ 6	430,799	$ (113,872)	(101,871)	(1,495)	213,567
Issuance of common stock in connection with exercise of options (in shares)	12
Issuance of common stock in connection with exercise of options		113				113
Vesting of restricted stock units (in shares)	84
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			33
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (800)			(800)
Repurchase of common stock (in shares)	(715)		715
Repurchase of common stock			$ (16,693)			(16,693)
Stock-based compensation expense		3,872				3,872
Comprehensive income (loss)				(1,147)	(1,037)	(2,184)
Balances (in shares) at Jun. 30, 2022	36,975		11,083
Balances at Jun. 30, 2022	$ 6	434,784	$ (131,365)	(103,018)	(2,532)	197,875
Issuance of common stock in connection with employee stock purchase plan (in shares)	92
Issuance of common stock in connection with employee stock purchase plan		1,509				1,509
Issuance of common stock in connection with exercise of options (in shares)	22
Issuance of common stock in connection with exercise of options		276				276
Vesting of restricted stock units (in shares)	206
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			70
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (1,601)			(1,601)
Stock-based compensation expense		5,136				5,136
Comprehensive income (loss)				1,385	(1,377)	8
Balances (in shares) at Sep. 30, 2022	37,295		11,153
Balances at Sep. 30, 2022	$ 6	$ 441,705	$ (132,966)	$ (101,633)	$ (3,909)	$ 203,203

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (3,912)	$ (14,488)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,173	4,806
Stock-based compensation expense	14,561	9,474
Amortization of acquired intangible assets	2,605	2,467
Amortization of costs capitalized to obtain revenue contracts	1,127	499
Deferred taxes	46	87
Other	(41)	125
Changes in operating assets and liabilities:
Accounts receivable	(14,999)	440
Prepaid expenses and other current assets	(2,750)	1,848
Operating lease right-of-use assets	1,510	1,043
Other non-current assets	1,479	(1,211)
Accounts payable	(2,852)	(1,969)
Accrued compensation and related benefits	3,624	(142)
Accrued and other liabilities	2,560	(167)
Deferred revenues	2,322	3,542
Billings in excess of recognized revenues	183	(1,334)
Operating lease liabilities	(1,613)	(1,193)
Net cash provided by (used in) operating activities	8,023	3,827
Cash flows from investing activities:
Proceeds from maturities and sales of short-term investments	136,000	136,000
Purchases of short-term investments	(45,791)	(90,985)
Purchases of property and equipment	(6,651)	(2,713)
Prepayment for the purchase of property and equipment	(54)
Purchases of intangible assets	150
Net cash provided by investing activities	83,354	42,302
Cash flows from financing activities:
Proceeds from exercise of stock options	1,064	1,251
Proceeds from employee stock purchase plan	3,011	1,035
Payments for taxes related to net share settlement of equity awards	(5,790)	(3,257)
Repurchases of common stock	(22,471)	(4,523)
Net cash used in financing activities	(24,186)	(5,494)
Effect of exchange rate changes on cash and cash equivalents	(1,147)	(193)
Net change in cash, cash equivalents, and restricted cash	66,044	40,442
Cash, cash equivalents, and restricted cash at beginning of period	27,684	33,815
Cash, cash equivalents, and restricted cash at end of period	93,728	74,257
Reconciliation of cash, cash equivalents, and restricted cash to the balance sheets:
Cash and cash equivalents	93,728	71,238
Restricted cash		3,019
Total cash, cash equivalents and restricted cash	93,728	74,257
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes	2,001	1,543
Cash paid for amounts included in the measurement of operating lease liabilities	1,219	1,538
Supplemental disclosure of noncash information:
Property and equipment received and accrued in accounts payable and accrued and other liabilities	2,200	247
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment	336	963
Operating lease liabilities arising from obtaining right-of-use assets	$ 2,268
Release of restricted cash reducing goodwill due to the acquisition purchase price adjustment		$ 469

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Note 1 - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2022

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments) to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the Securities and Exchange Commission on March 1, 2022.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions.

The accompanying Condensed Consolidated Balance Sheet at December 31, 2021, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include revenue recognition, the estimated useful lives of property and equipment and intangible assets, assumptions made in analysis of allowance for doubtful accounts, impairment of goodwill and long-lived assets, valuation for deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income tax uncertainties and contingencies. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position.

The global COVID-19 pandemic (“COVID-19”) has impacted the operations and purchasing decisions of companies worldwide. As of the date of issuance of the condensed consolidated financial statements, the Company is not aware of any specific event or circumstance relating to COVID-19 that would require updates to the Company’s estimates and judgments or revisions to the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the financial statements.

Recent Accounting Standards

Accounting Standards Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires measurement and recognition of expected credit losses for financial assets held at the reporting date based on internal information, external information, or a combination of both relating to past events, current conditions, and reasonable and supportable forecasts. ASU No. 2016-13 replaces the existing incurred loss impairment model with a forward-looking expected credit loss model, which will result in earlier recognition of credit losses. Subsequent to the issuance of ASU No. 2016-13, the FASB issued ASU No. 2018-19, Codification

Improvements to Topic 326, Financial Instruments – Credit Losses, ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instrument, ASU No. 2019-05, Financial Instruments – Credit Losses (Topic 326) Targeted Transition Relief, ASU No. 2016-13, ASU No. 2019-10 Financial Instruments-Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and ASU No. 2019-11 Codification Improvements to Topic 326, Financial Instruments-Credit Losses. The subsequent ASUs do not change the core principle of the guidance in ASU No. 2016-13. Instead, these amendments are intended to clarify and improve operability of certain topics included within ASU No. 2016-13.

Additionally, ASU No. 2019-10 defers the effective date for the adoption of the new standard on credit losses for public filers that are considered small reporting companies (“SRC”) as defined by the SEC to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, which will be fiscal 2023 for the Company. In February 2020, the FASB issued ASU 2020-02, which provides guidance regarding methodologies, documentation, and internal controls related to expected credit losses. The subsequent amendments will have the same effective date and transition requirements as ASU No. 2016-13. Topic 326 requires a modified retrospective approach by recording a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. While the Company is currently evaluating the impact of Topic 326, the Company does not expect the adoption of this ASU to have a material impact on its condensed consolidated financial statements or the related disclosure.

Management has reviewed other recently issued accounting pronouncements issued or proposed by the FASB, and does not believe any of these accounting pronouncements has had or will have a material impact on the condensed consolidated financial statements.

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Note 2 - REVENUE FROM CONTACTS WITH CUSTOMERS

9 Months Ended

Sep. 30, 2022

REVENUE FROM CONTRACTS WITH CUSTOMERS

2. REVENUE FROM CONTRACT WITH CUSTOMERS

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

The Company derives revenue from two sources: Analytics revenue and Integrated Yield Ramp revenue.

The Company recognizes revenue in accordance with FASB ASC Topic 606, Revenue from Contracts with Customers, and its related amendments (collectively known as “ASC 606”). ASC 606 outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers. Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services.

The Company determines revenue recognition through the following five steps:

● Identification of the contract, or contracts, with a customer

● Identification of the performance obligations in the contract

● Determination of the transaction price

● Allocation of the transaction price to the performance obligations in the contract

● Recognition of revenue when, or as, performance obligations are satisfied

The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance, and collectability of consideration is probable.

Contracts with multiple performance obligations

The Company enters into contracts that can include various combinations of licenses, products and services, some of which are distinct and are accounted for as separate performance obligations. For contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the standalone selling price (“SSP”).

Analytics Revenue

Analytics revenue is derived from the following primary offerings: licenses and services for standalone software (which is primarily Exensio^® and Cimetrix^® products), software-as-a-service (“SaaS”) (which is primarily Exensio^® products), and DFI™ systems and CV^® systems that do not include performance incentives based on customers’ yield achievement.

Revenue from standalone software is recognized depending on whether the license is perpetual or time-based. Perpetual (one-time charge) license software is recognized at the time of the inception of the arrangement when control transfers to the customers, if the software license is considered as a separate performance obligation from the services offered by the Company. Revenue from post-contract support is recognized over the contract term on a straight-line basis, because we are providing (i) support and (ii) unspecified software updates on a when-and-if available basis over the contract term. Revenue from time-based-licensed software is allocated to each performance obligation and is recognized either at a point in time or over time as follows. The license component is recognized at the time when control transfers to customers, with the post-contract support component recognized ratably over the committed term of the contract. For contracts with any combination of licenses, support, and other services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from SaaS arrangements, which allow for the use of a cloud-based software product or service over a contractually determined period of time without the customer having to take possession of software, is accounted for as a subscription and is recognized as revenue ratably, on a straight-line basis, over the subscription period beginning on the date the service is first made available to customers. For contracts with any combination of SaaS and related services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from DFI systems and CV systems that do not include performance incentives based on customers’ yield achievement is recognized primarily as services are performed. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs. For those contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation. Where there are not discrete performance obligations, historically, revenue is primarily recognized as services are performed using a percentage of completion method based on costs or labor-hours inputs, whichever is the most appropriate measure of the progress towards completion of the contract. The estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

Integrated Yield Ramp Revenue

Integrated Yield Ramp revenue is derived from the Company’s fixed-fee engagements that include performance incentives based on customers’ yield achievement (which consists primarily of Gainshare royalties) typically based on customer’s wafer shipments, pertaining to these fixed-price contracts, which royalties are variable.

Revenue under these project-based contracts, which are delivered over a specific period of time, typically for a fixed fee component paid on a set schedule, is recognized as services are performed using a percentage of completion method based on costs or labor-inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs and allocates the transaction price of the contract to each performance obligation on a relative basis using SSP. Similar to the services provided in connection with DFI systems and CV systems that are contributing to Analytics revenue, due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

The Gainshare royalty contained in Integrated Yield Ramp contracts is a variable fee related to continued usage of the Company’s intellectual property after the fixed-fee service period ends, based on a customer’s yield achievement. Revenue derived from Gainshare is contingent upon the Company’s customers reaching certain defined production yield levels. Gainshare royalty periods are generally subsequent to the delivery of all contractual services and performance obligations. The Company records Gainshare as a usage-based royalty derived from customers’ usage of intellectual property and records it in the same period in which the usage occurs.

Disaggregation of Revenue

The Company disaggregates revenue from contracts with customers into the timing of the transfer of goods and services and the geographical regions. The Company determined that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors.

The Company’s performance obligations are satisfied either over time or at a point-in-time. The following table represents a disaggregation of revenue percentage by timing of revenue:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Over time	68		72	%	70	%	60	%
Point-in-time	32		28	%	30	%	40	%
Total	100	%	100	%	100	%	100	%

International revenues accounted for approximately 54% and 51% of our total revenues during the three and nine months ended September 30, 2022, respectively, compared to 53% and 57% of our total revenues during the three and nine months ended September 30, 2021, respectively. See Note 10, Customer and Geographic Information.

Significant Judgments

Judgments and estimates are required under ASC 606. Due to the complexity of certain contracts, the actual revenue recognition treatment required under ASC 606 for the Company’s arrangements may be dependent on contract-specific terms and may vary in some instances.

For revenue under project-based contracts for fixed-price implementation services, revenue is recognized as services are performed using a percentage-of-completion method based on costs or labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. Due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may result in increases or decreases in estimated revenues or costs, and such revisions are reflected in revenue on a cumulative catch-up basis in the period in which the circumstances that gave rise to the revision become known.

The Company’s contracts with customers often include promises to transfer products, licenses software and provide services, including professional services, technical support services, and rights to unspecified updates to a customer. Determining whether licenses and services are distinct performance obligations that should be accounted for separately, or not distinct and thus accounted for together, requires significant judgment. The Company rarely licenses software on a standalone basis, so the Company is required to estimate the range of SSPs for each performance obligation. In instances where SSP is not directly observable because the Company does not license the software or sell the service separately, the Company determines the SSP using information that may include market conditions and other observable inputs.

The Company is required to record Gainshare royalty revenue in the same period in which the usage occurs. Because the Company generally does not receive the acknowledgment reports from its customers during a given quarter within the time frame necessary to adequately review the reports and include the actual amounts in quarterly results for such quarter, the Company accrues the related revenue based on estimates of customers underlying sales achievement. The Company’s estimation process can be based on historical data, trends, seasonality, changes in the contract rate, knowledge of the changes in the industry and changes in the customer’s manufacturing environment learned through discussions with customers and sales personnel. As a result of accruing revenue for the quarter based on such estimates, adjustments will be required in the following quarter to true-up revenue to the actual amounts reported.

Contract Balances

The Company performs its obligations under a contract with a customer by licensing software or providing services in exchange for consideration from the customer. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a receivable, a contract asset or a contract liability.

The Company classifies the right to consideration in exchange for software or services transferred to a customer as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional, as compared to a contract asset, which is a right to consideration that is conditional upon factors other than the passage of time. The majority of the Company’s contract assets represent unbilled amounts related to fixed-price service contracts when the revenue recognized exceeds the amount billed to the customer. The contract assets are generally classified as current and are recorded on a net basis with deferred revenue (i.e., contract liabilities) at the contract level. At September 30, 2022 and December 31, 2021, the total contract assets included in prepaid expenses and other current assets in the accompanying Condensed Consolidated Balance Sheets were $1.9 million and $0.4 million, respectively. The Company did not record any asset impairment charges related to contract assets for the periods presented.

Deferred revenues and billings in excess of recognized revenues consist substantially of amounts invoiced in advance of revenue recognition and are recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding twelve-month period are recorded as current deferred revenues and the remaining portion is recorded as non-current deferred revenues in the accompanying Condensed Consolidated Balance Sheets. Revenue recognized that was included in the deferred revenues and billings in excess of recognized revenues balances at the beginning of each reporting period was $10.6 million and $7.0 million during the three months ended September 30, 2022 and 2021, respectively, and $16.3 million and $13.8 million during the nine months ended September 30, 2022 and 2021, respectively.

At September 30, 2022, the aggregate amount of the transaction price allocated to the remaining performance obligations related to customer contracts that were unsatisfied or partially unsatisfied was approximately $185.4 million. Given the applicable contract terms with customers, the majority of this amount is expected to be recognized as revenue over the next two years, with the remainder in the following three years. This amount does not include insignificant contracts to which the customer is not committed, nor significant contracts for which we recognize revenue equal to the amount we have the right to invoice for services performed, or future sales-based or usage-based royalty payments in exchange for a license of intellectual property. This amount is subject to change due to future revaluations of variable consideration, terminations, other contract modifications, or currency adjustments. The estimated timing of the recognition of remaining unsatisfied performance obligations is subject to change and is affected by changes to the scope, change in timing of delivery of products and services, or contract modifications.

The adjustment to revenue recognized from performance obligations satisfied (or partially satisfied) in previous periods was an increase of $1.9 million and a decrease of $0.2 million during the three months ended September 30, 2022 and 2021, respectively, and an increase of $0.4 million and $34,000 during the nine months ended September 30, 2022 and 2021, respectively. These amounts primarily represent changes in estimated percentage-of-completion based contracts and changes in actual versus estimated Gainshare royalty.

Costs to obtain or fulfill a contract

The Company capitalizes the incremental costs to obtain or fulfill a contract with a customer, including direct sales commissions and related fees, when it expects to recover those costs. Amortization expense related to these capitalized costs is recognized over the period associated with the revenue from which the cost was incurred. Total capitalized direct sales commission costs included in prepaid expenses and other current assets in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2022, and December 31, 2021, were $1.4 million and $0.6 million, respectively. Total capitalized direct sales commission costs included in other non-current assets in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2022, and December 31, 2021, were $1.7 million and $2.1 million, respectively. Amortization of these assets were $0.4 million and $0.2 million during the three months ended September 30, 2022 and 2021, respectively, and $1.1 million and $0.5 million during the nine months ended September 30, 2022 and 2021, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Practical expedient

The Company does not adjust the transaction price for the effects of a significant financing component when the period between the transfers of the promised good or service to the customer and payment for that good or service by the customer is expected to be one year or less. The Company assessed each of its revenue generating arrangements in order to determine whether a significant financing component exists, and determined its contracts did not include a significant financing component during the three and nine months ended September 30, 2022 and 2021.

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Note 3 - STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS

9 Months Ended

Sep. 30, 2022

STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS

3. STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS

3. STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS

On July 29, 2020, the Company entered into a long-term strategic partnership with Advantest Corporation through its wholly-owned subsidiary, Advantest America, Inc. (collectively referred to herein as “Advantest”) that included the following agreements.

● A Securities Purchase Agreement for the purchase by Advantest of an aggregate of 3,306,924 shares of the Company’s common stock for aggregate gross proceeds of $65.2 million and a related Stockholder Agreement.

● An Amendment #1 to that certain Software License and Related Services Agreement, dated as of March 25, 2020, for an exclusive commercial arrangement in which the Company and Advantest collaborate on, and the Company initially hosts, develops and maintains, an Advantest-specific cloud layer on the Exensio platform. On June 5, 2022, the parties amended Amendment #1 to provide another approved DEX Site (as defined therein).  

● An Amended and Restated Master Development Agreement with Advantest, pursuant to which the Company and Advantest agreed to collaborate on extensions to or combinations of both of their existing technology and new technology to address mutual customers’ needs through one or more development phases subject to certain conditions as set forth therein. Costs and expenses incurred related to this agreement have not been significant for the three and nine months ended September 30, 2022 and 2021.

● A Master Commercial Terms and Support Services Agreement for the commercialization and support of integrated products of the Company and Advantest that are the outcome of the above development agreement. No material costs and expenses were incurred related to the Commercial Agreement with Advantest during the three and nine months ended September 30, 2022 and 2021.

Analytics revenue recognized from Advantest was $2.8 million and $8.1 million during the three and nine months ended September 30, 2022, respectively, compared to $2.7 million and $7.9 million during the three and nine months ended September 30, 2021, respectively. Accounts receivable from Advantest amounted to $10.4 million as of September 30, 2022, and nil as of December 31, 2021, and deferred revenue amounted to $9.1 million and $6.8 million as of September 30, 2022 and December 31, 2021, respectively. There was no occurrence of any termination events under these agreements as of the issuance of these condensed consolidated financial statements.

The Company carries out transactions with Advantest on arm’s length commercial customary terms.

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Note 4 - BALANCE SHEET COMPONENTS

9 Months Ended

Sep. 30, 2022

BALANCE SHEET COMPONENTS

4. BALANCE SHEET COMPONENTS

4. BALANCE SHEET COMPONENTS

Accounts receivable

Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within a 12-month period. Unbilled accounts receivable, included in accounts receivable, totaled $9.8 million and $11.8 million as of September 30, 2022, and December 31, 2021, respectively. Unbilled accounts receivable that are not expected to be billed and collected during the succeeding 12-month period is recorded in other non-current assets and totaled $1.0 million and $1.3 million as of September 30, 2022, and December 31, 2021, respectively.

The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.

Property and equipment

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

	September 30,		December 31,
	2022		2021
Computer equipment	$	11,711	$	11,924
Software		5,359		5,419
Furniture, fixtures and equipment		2,467		2,506
Leasehold improvements		6,277		6,272
Laboratory and other equipment		4,340		3,981
Test equipment		28,311		24,452
Construction-in-progress		24,965		22,158
		83,430		76,712
Less: Accumulated depreciation and amortization		(44,690)		(41,417)
Total	$	38,740	$	35,295

Test equipment mainly includes DFI™ systems and CV^® systems assets at customer sites that are contributing to revenue. Among assets under construction, the construction-in-progress balance related to construction of DFI™ systems assets amounted to $20.1 million and $20.0 million as of September 30, 2022, and December 31, 2021, respectively. Depreciation and amortization expense was $1.4 million and $1.5 million during the three months ended September 30, 2022 and 2021, respectively, and $4.2 million and $4.8 million during the nine months ended September 30, 2022 and 2021, respectively.

In the fourth quarter of 2021, the Company wrote down the value of its property and equipment by $3.2 million related to its first-generation of e-beam tools for DFI™ systems wherein carrying values may not be fully recoverable due to lack of market demand and future needs of our customers for these tools.

Goodwill and Intangible Assets, Net

As of September 30, 2022, and December 31, 2021, the carrying amount of goodwill was $14.1 million.

Intangible assets, net, consisted of the following (in thousands):

		September 30, 2022						December 31, 2021
	Amortization	Gross				Net		Gross				Net
	Period	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
	(Years)	Amount		Amortization		Amount		Amount		Amortization		Amount
Acquired identifiable intangibles:
Customer relationships	1-10	$	9,407	$	(6,524)	$	2,883	$	9,407	$	(6,041)	$	3,366
Developed technology	4-9		33,635		(19,046)		14,589		33,635		(17,250)		16,385
Tradename and trademarks	2-10		1,598		(892)		706		1,598		(812)		786
Patent	7-10		2,100		(1,674)		426		1,800		(1,640)		160
Noncompetition agreements	3		848		(518)		330		848		(306)		542
Total		$	47,588	$	(28,654)	$	18,934	$	47,288	$	(26,049)	$	21,239

The weighted average amortization period for acquired identifiable intangible assets was 6.1 years as of September 30, 2022. The following table summarizes intangible assets amortization expense in the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss) (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Amortization of acquired technology included under Costs of Revenues	$	553	$	456	$	1,659	$	1,525
Amortization of acquired intangible assets presented separately under Costs and Expenses		318		314		946		942
Total amortization of acquired intangible assets	$	871	$	770	$	2,605	$	2,467

The Company expects annual amortization of acquired identifiable intangible assets to be as follows (in thousands):

Year Ending December 31,	Amount
2022 (remaining three months)	$	879
2023		3,491
2024		3,093
2025		2,928
2026		2,759
2027 and thereafter		5,784
Total future amortization expense	$	18,934

There were no impairment charges for goodwill and intangible assets during the three and nine months ended September 30, 2022 and 2021.

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Note 5 - LEASES

9 Months Ended

Sep. 30, 2022

LEASES

5. LEASES

5. LEASES

The Company leases administrative and sales offices and certain equipment under non-cancellable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various dates through 2028. The Company had no leases that were classified as a financing lease as of September 30, 2022, and December 31, 2021.

In the first quarter of 2022, the Company early terminated an office lease contract. The termination of this lease reduced the Company’s operating lease right-of-use assets and lease liabilities by approximately $0.5 million and $0.6 million, respectively. The gain from the lease termination of approximately $0.1 million was recorded under selling, general and administrative expense in the accompanying Condensed Consolidated Statement of Comprehensive Income (Loss) for the nine months ended September 30, 2022.

Lease expense was comprised of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Operating lease expense (1)	$	375	$	448	$	1,073	$	1,417
Short-term lease and variable lease expense (2)		244		196		801		602
Total lease expense	$	619	$	644	$	1,874	$	2,019

(1) Net of gain recognized upon lease termination of $0.1 million in the nine months ended September 30, 2022.

(2) Leases with an initial term of 12 months or less are not recorded on the accompanying Condensed Consolidated Balance Sheets, and the Company recognizes lease expense for these leases on a straight-line basis over the lease term. Variable lease expense for the periods presented primarily included common area maintenance charges.

Supplemental condensed consolidated balance sheets information related to operating leases was as follows:

	September 30,			December 31,
	2022			2021
Weighted average remaining lease term under operating ROU leases (in years)		5.6			5.7
Weighted average discount rate for operating lease liabilities		4.82	%		5.25	%

Maturities of operating lease liabilities as of September 30, 2022, were as follows (in thousands):

Year Ending December 31,	Amount (1)
2022 (remaining three months)	$	400
2023		1,600
2024		1,538
2025		1,454
2026		1,355
2027 and thereafter		2,286
Total future minimum lease payments	$	8,633
Less: Interest (2)		(1,111)
Present value of future minimum lease payments under operating lease liabilities (3)	$	7,522

(1) As of September 30, 2022, the total operating lease liability includes approximately $0.9 million related to an option to extend a lease term that is reasonably certain to be exercised.

(2) Calculated using incremental borrowing interest rate for each lease.

(3) Includes the current portion of operating lease liabilities of $1.4 million as of September 30, 2022.

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Note 6 - STOCKHOLDERS EQUITY

9 Months Ended

Sep. 30, 2022

STOCKHOLDERS EQUITY

6. STOCKHOLDERS' EQUITY

6. STOCKHOLDERS’ EQUITY

Stock Repurchase Program

On June 4, 2020, the Company’s Board of Directors adopted a stock repurchase program (the “2020 Program”) to repurchase up to $25.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, including through Rule 10b5-1 plans, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 218,858 shares under the 2020 Program at an average price of $26.40 per share for an aggregate total price of $5.8 million. During the nine months ended September 30, 2021, the Company repurchased 251,212 shares under the 2020 Program at an average price of $18.01 per share for an aggregate total price of $4.5 million. Through April 10, 2022, 470,070 shares had been repurchased under the 2020 Program at an average price of $21.91 per share, for an aggregate total price of $10.3 million.

On April 11, 2022, the Board of Directors terminated the 2020 Program, and adopted a new program (the “2022 Program”) to repurchase up to $35.0 million of the Company’s common stock both on the open market and in privately negotiated transactions, from time to time, over the next two years. During the nine months ended September 30, 2022, the Company repurchased 714,600 shares under the 2022 Program at an average price of $23.36 per share for an aggregate total price of $16.7 million.

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Note 7 - EMPLOYEE BENEFIT PLANS

9 Months Ended

Sep. 30, 2022

EMPLOYEE BENEFIT PLANS

7. EMPLOYEE BENEFIT PLANS

7. EMPLOYEE BENEFIT PLANS

On September 30, 2022, the Company had the following stock-based compensation plans:

Employee Stock Purchase Plan

In July 2001, the Company’s stockholders initially approved the 2001 Employee Stock Purchase Plan, which was subsequently amended and restated in 2010 (as amended, the “2010 Purchase Plan”) to extend the term of the plan through May 17, 2020. Under the 2010 Purchase Plan, eligible employees could contribute up to 10% of their compensation, as defined in the 2010 Purchase Plan, towards the purchase of shares of PDF common stock at a price of 85% of the lower of the fair market value at the beginning of the offering period or the end of the purchase period. The 2010 Purchase Plan provided for twenty-four-month offering periods with four six-month purchase periods in each offering period. The 2010 Purchase Plan expired on May 17, 2020. Existing offering periods under the 2010 Plan continued through the applicable expiration date and the final offering period expired on January 31, 2022. On June 15, 2021, the Company’s stockholders approved the 2021 Employee Stock Purchase Plan, which has a ten-year term (the “2021 Purchase Plan” and, together with the 2010 Purchase Plan, the “Employee Purchase Plans”). The terms of 2021 Purchase Plan are substantially similar to those of the 2010 Purchase Plan. A twenty-four-month offering period under the 2021 Purchase Plan commenced on August 1, 2021.

The Company estimated the fair value of purchase rights granted under the 2021 Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values:

	Nine Months Ended September 30,
	2022			2021
Expected life (in years)		1.25			1.25
Volatility		48.73	%		48.00	%
Risk-free interest rate		2.75	%		0.11	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted during the period	$	10.00		$	6.71

During the three months ended September 30, 2022, a total of 92,043 shares were issued under the 2021 Purchase Plan, at a weighted-average purchase price of $16.40 per share. During the nine months ended September 30, 2022, a total of 182,083 shares were issued under the 2021 Purchase Plan, at a weighted-average purchase price of $16.15 per share. During the nine months ended September 30, 2022 and 2021, a total of 5,203 and 108,623 shares, respectively, were issued under the 2010 Purchase Plan, at a weighted-average purchase price of $13.40 per share and $9.53 per share, respectively. As of September 30, 2022, unrecognized compensation cost related to the 2021 Purchase Plan was $1.6 million. This estimated unrecognized cost is expected to be recognized over a weighted average period of 1.2 years. There was no unrecognized compensation cost related to the 2010 Purchase Plan as of September 30, 2022.

As of September 30, 2022, 817,917 shares were available for future issuance under the 2021 Purchase Plan.

Stock Incentive Plans

On November 16, 2011, the Company’s stockholders initially approved the 2011 Stock Incentive Plan, which has been amended and restated and approved by the Company’s stockholders a number of times since then (as amended, the “2011 Plan”). Under the 2011 Plan, the Company may award stock options, stock appreciation rights (“SARs”), stock grants or stock units covering shares of the Company’s common stock to employees, directors, non-employee directors and contractors. The aggregate number of shares reserved for awards under the 2011 Plan is 12,800,000 shares, plus up to 3,500,000 shares previously issued under the 2001 Stock Plan adopted by the Company in 2001, which expired in 2011 (the “2001 Plan”) that are either (i) forfeited or (ii) repurchased by the Company or are shares subject to awards previously issued under the 2001 Plan that expire or that terminate without having been exercised or settled in full on or after November 16, 2011. In case of awards other than options or SARs, the aggregate number of shares reserved under the 2011 Plan will be decreased at a rate of 1.33 shares issued pursuant to such awards. The exercise price for stock options must generally be at prices no less than the fair market value at the date of grant. Stock options generally expire ten years from the date of grant and become vested and exercisable over a four-year period.

As of September 30, 2022, 13.3 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 3.5 million shares were available for future grant. The number of shares reserved and available under the 2011 Plan includes 0.5 million shares that were subject to awards previously made under the 2001 Plan and were forfeited, expired or repurchased by the Company after the adoption of the 2011 Plan through September 30, 2022. As of September 30, 2022, there were no outstanding awards that had been granted outside of the 2011 or 2001 Plans (collectively, the “Stock Plans”).

The Company estimated the fair value of share-based awards granted under the 2011 Stock Plan during the period using the Black-Scholes-Merton option-pricing model. There were no stock options granted during the three and nine months ended September 30, 2022 and 2021.

Stock-Based Compensation

Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expense before taxes related to the Company’s stock plans and employee stock purchase plans was allocated as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Costs of revenues	$	854	$	670	$	2,237	$	1,860
Research and development		2,180		1,299		7,158		4,013
Selling, general and administrative		2,102		1,394		5,166		3,601
Stock-based compensation expenses	$	5,136	$	3,363	$	14,561	$	9,474

Additional information with respect to options under the Stock Plans during the nine months ended September 30, 2022, is as follows:

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
	(in thousands)	per Share		(Years)	(in thousands)
Outstanding, January 1, 2022	226	$	12.78
Granted	—		—
Exercised	(109)		9.79
Canceled	(6)		13.35
Expired	(2)		8.79
Outstanding, September 30, 2022	109	$	15.77	3.93	$	960
Vested and expected to vest, September 30, 2022	109	$	15.77	3.91	$	955
Exercisable, September 30, 2022	94	$	15.75	3.42	$	825

The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $24.53 per share as of September 30, 2022. The total intrinsic value of options exercised was $1.8 million during the nine months ended September 30, 2022.

As of September 30, 2022, there was $0.1 million of total unrecognized compensation cost, net of forfeiture, related to unvested stock options, which is expected to be recognized over a weighted average period of 1.2 years. The total fair value of shares vested was immaterial during the nine months ended September 30, 2022.

Nonvested restricted stock unit activity during the nine months ended September 30, 2022, was as follows:

		Weighted
		Average Grant
	Shares	Date Fair Value
	(in thousands)	Per Share
Nonvested, January 1, 2022	1,872	$	18.24
Granted	1,144	$	22.74
Vested	(738)	$	18.13
Forfeited	(75)	$	19.41
Nonvested, September 30, 2022	2,203	$	20.57

As of September 30, 2022, there was $35.0 million of total unrecognized compensation cost related to restricted stock units. That cost is expected to be recognized over a weighted average period of 2.7 years. Restricted stock units do not have rights to dividends prior to vesting.

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Note 8 - INCOME TAXES

9 Months Ended

Sep. 30, 2022

INCOME TAXES

8. INCOME TAXES

8. INCOME TAXES

Income tax expense increased by $1.8 million for the nine months ended September 30, 2022, to a $3.3 million income tax expense as compared to $1.5 million for the nine months ended September 30, 2021. The Company’s effective tax rate expense was (547.7%) and (12.0%) for the nine months ended September 30, 2022 and 2021, respectively. The Company’s effective tax rate expense increased in the nine months ended September 30, 2022, as compared to the same period in 2021, primarily due to increases in foreign withholding taxes and changes in the geographic mix of worldwide income, which is subject to taxation at different statutory tax rates.

The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of September 30, 2022, was $15.2 million, of which $1.8 million, if recognized, would affect the Company’s effective tax rate. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2021, was $14.7 million, of which $2.0 million, if recognized, would affect the Company’s effective tax rate. As of September 30, 2022, the Company has recorded unrecognized tax benefits of $2.3 million, including interest and penalties of $0.6 million, as long-term taxes payable in the accompanying Condensed Consolidated Balance Sheet. The remaining $13.5 million has been recorded net of the Company’s deferred tax assets (“DTAs”), which is subject to a full valuation allowance.

The valuation allowance was approximately $51.6 million as of September 30, 2022, and December 31, 2021, which was related to U.S. net federal and state DTAs. The worldwide net deferred tax assets balance as of September 30, 2022, and December 31, 2021 were not significant.

The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. For U.S. federal and California income tax purposes, the statute of limitations currently remains open for the tax years ending 2018 to present and 2017 to present, respectively. In addition, due to net operating loss carryback claims, the tax years 2013 through 2015 may be subject to federal examination and all of the net operating loss and research and development credit carryforwards that may be utilized in future years may be subject to federal and state examination. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

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Note 9 - NET LOSS PER SHARE

9 Months Ended

Sep. 30, 2022

NET LOSS PER SHARE

9. NET INCOME (LOSS) PER SHARE

9. NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income (loss) per share (in thousands except per share amount):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	1,385	$	(2,407)	$	(3,912)	$	(14,488)
Denominator:
Basic weighted-average shares outstanding		37,226		37,221		37,285		37,067
Effect of dilutive options and restricted stock units		828		—		—		—
Diluted weighted-average shares outstanding		38,054		37,221		37,285		37,067
Net income (loss) per share – Basic	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)
Net income (loss) per share – Diluted	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)

For the nine months ended September 30, 2022 and for the three and nine months ended 2021, because the Company was in a loss position, basic net loss per share is the same as diluted net loss per share as the inclusion of the potential common shares would have been anti-dilutive.

The following table sets forth potential shares of common stock that were not included in the diluted net income (loss) per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):

	Three Months Ended September 30,		Nine Months Ended September 30,
	2022	2021	2022	2021
Outstanding options	—	128	63	182
Nonvested restricted stock units	62	915	784	997
Employee Stock Purchase Plan	—	30	75	14
Total	62	1,073	922	1,193

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION

9 Months Ended

Sep. 30, 2022

CUSTOMER AND GEOGRAPHIC INFORMATION

10. CUSTOMER AND GEOGRAPHIC INFORMATION

10. CUSTOMER AND GEOGRAPHIC INFORMATION

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.

The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions, allocation of resources, and assessing financial performance. Accordingly, the Company considers itself to be in one operating and reporting segment, specifically the provision of services for differentiated data and analytics solutions to the semiconductor and electronics industries.

The Company had revenues from individual customers that are approximately 10% or more of the Company’s consolidated total revenues as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
Customer	2022		2021		2022		2021
A	28	%	25	%	30	%	12	%
B	16	%	*	%	11	%	*	%
C	*	%	*	%	*	%	10	%

* represents less than 10%

Gross accounts receivable balances (including amounts that are unbilled) from individual customers that are approximately 10% or more of the Company’s gross accounts receivable balance as follows:

	September 30,		December 31,
Customer	2022		2021
A	27	%	29	%
B	14	%	15	%
C	18	%	*	%

* represents less than 10%

Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (amounts in thousands):

	Three Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	18,292	46	%	$	13,983	47	%
China		9,555	24			4,038	14
Japan		2,818	7			2,515	9
Rest of the world		9,195	23			9,019	30
Total revenue	$	39,860	100	%	$	29,555	100	%

	Nine Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	52,869	49	%	$	34,634	43	%
China		18,214	17			10,065	12
Japan		8,219	8			8,543	10
Rest of the world		28,724	26			27,932	35
Total revenue	$	108,026	100	%	$	81,174	100	%

Long-lived assets, net by geographic area are as follows (in thousands):

	September 30,		December 31,
	2022		2021
United States (1)	$	43,469	$	39,158
Rest of the world		1,293		1,545
Total long-lived assets, net	$	44,762	$	40,703

(1) Includes assets deployed at customer sites which could be outside the U.S.

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Note 11 - FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2022

FAIR VALUE MEASUREMENTS

11. FAIR VALUE MEASUREMENTS

11. FAIR VALUE MEASUREMENTS

Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its

own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.

Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following table represents the Company’s assets measured at fair value on a recurring basis as of September 30, 2022, and December 31, 2021, and the basis for those measurements (in thousands):

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other
			Identical		Observable		Significant
	September 30,		Assets		Inputs		Unobservable
Assets	2022		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents
Money market mutual funds	$	70,934	$	70,934	$	—	$	—
U.S. Government securities (1)		2,994		2,994		—		—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		22,357		22,357		—		—
Total	$	96,285	$	96,285	$	—	$	—

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents
Money market mutual funds	$	12,474	$	12,474	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		112,542		112,542		—		—
Total	$	125,016	$	125,016	$	—	$	—

(1) As of September 30, 2022, and December 31, 2021, the amortized cost of the Company’s investments in U.S Government securities approximated their fair value due to their short-term maturities, and there have been no events or changes in circumstances that would have had a significant effect on the fair value of these securities in the periods presented. There was no material realized or unrealized gains or losses, either individually or in the aggregate.

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Note 12 - COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2022

COMMITMENTS AND CONTINGENCIES

12. COMMITMENTS AND CONTINGENCIES

12. COMMITMENTS AND CONTINGENCIES

Strategic Partnership with Advantest — See Note 3, Strategic Partnership Agreement with Advantest And Related Party Transactions, for the discussion about the Company’s commitments under the strategic partnership with Advantest.

Operating Leases — Refer to Note 5, Leases, for the discussion about the Company’s lease commitments.

Indemnifications — The Company generally provides a warranty to its customers that its software will perform substantially in accordance with documented specifications typically for a period of 90 days following initial delivery of its products. The Company also indemnifies certain customers from third-party claims of intellectual property infringement relating to the use of its products. Historically, costs related to these guarantees have not been significant. The Company is unable to estimate the maximum potential impact of these guarantees on its future results of operations.

Purchase Obligations — The Company has purchase obligations with certain suppliers for the purchase of goods and services entered in the ordinary course of business. As of September 30, 2022, total outstanding purchase obligations were $13.7 million, the majority of which is due within the next 12 months.

Indemnification of Officers and Directors — As permitted by the Delaware general corporation law, the Company has included a provision in its certificate of incorporation to eliminate the personal liability of its officers and directors for monetary damages for breach or alleged breach of their fiduciary duties as officers or directors, other than in cases of fraud or other willful misconduct.

In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may be indemnified. The Company has entered into indemnification agreements with its officers and directors containing provisions that are in some respects broader than the specific indemnification provisions contained in the Delaware general corporation law. The indemnification agreements require the Company to indemnify its officers and directors against liabilities that may arise by reason of their status or service as officers and directors other than for liabilities arising from willful misconduct of a culpable nature, to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified, and to obtain directors’ and officers’ insurance if available on reasonable terms. The Company has obtained directors’ and officers’ liability insurance in amounts comparable to other companies of the Company’s size and in the Company’s industry. Since a maximum obligation of the Company is not explicitly stated in the Company’s Bylaws or in its indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated.

Legal Proceedings — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable, and the loss can be reasonably estimated in accordance with FASB requirements. As of September 30, 2022, except as disclosed below, the Company was not party to any material legal proceedings for which a loss was probable or an amount was accrued.

On May 6, 2020, the Company initiated an arbitration proceeding with the Hong Kong International Arbitration Center against SMIC New Technology Research & Development (Shanghai) Corporation (“SMIC”) due to SMIC’s failure to pay fees due to PDF under a series of contracts. The Company seeks to recover the unpaid fees, a declaration requiring SMIC to pay fees under the contracts in the future, and costs associated with bringing the arbitration proceeding. SMIC denies liability and the arbitration is on-going.

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Note 1 - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2022

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation, Policy

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments) to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, filed with the Securities and Exchange Commission on March 1, 2022.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions.

The accompanying Condensed Consolidated Balance Sheet at December 31, 2021, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates, Policy

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include revenue recognition, the estimated useful lives of property and equipment and intangible assets, assumptions made in analysis of allowance for doubtful accounts, impairment of goodwill and long-lived assets, valuation for deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income tax uncertainties and contingencies. Actual results could differ from those estimates and may result in material effects on the Company’s operating results and financial position.

The global COVID-19 pandemic (“COVID-19”) has impacted the operations and purchasing decisions of companies worldwide. As of the date of issuance of the condensed consolidated financial statements, the Company is not aware of any specific event or circumstance relating to COVID-19 that would require updates to the Company’s estimates and judgments or revisions to the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the financial statements.

Revenue from Contracts with Customers, Policy

The Company recognizes revenue in accordance with FASB ASC Topic 606, Revenue from Contracts with Customers, and its related amendments (collectively known as “ASC 606”). ASC 606 outlines a single comprehensive model to use in accounting for revenue arising from contracts with customers. Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services.

The Company determines revenue recognition through the following five steps:

● Identification of the contract, or contracts, with a customer

● Identification of the performance obligations in the contract

● Determination of the transaction price

● Allocation of the transaction price to the performance obligations in the contract

● Recognition of revenue when, or as, performance obligations are satisfied

The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance, and collectability of consideration is probable.

Contracts with multiple performance obligations

The Company enters into contracts that can include various combinations of licenses, products and services, some of which are distinct and are accounted for as separate performance obligations. For contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the standalone selling price (“SSP”).

Analytics Revenue

Analytics revenue is derived from the following primary offerings: licenses and services for standalone software (which is primarily Exensio^® and Cimetrix^® products), software-as-a-service (“SaaS”) (which is primarily Exensio^® products), and DFI™ systems and CV^® systems that do not include performance incentives based on customers’ yield achievement.

Revenue from standalone software is recognized depending on whether the license is perpetual or time-based. Perpetual (one-time charge) license software is recognized at the time of the inception of the arrangement when control transfers to the customers, if the software license is considered as a separate performance obligation from the services offered by the Company. Revenue from post-contract support is recognized over the contract term on a straight-line basis, because we are providing (i) support and (ii) unspecified software updates on a when-and-if available basis over the contract term. Revenue from time-based-licensed software is allocated to each performance obligation and is recognized either at a point in time or over time as follows. The license component is recognized at the time when control transfers to customers, with the post-contract support component recognized ratably over the committed term of the contract. For contracts with any combination of licenses, support, and other services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from SaaS arrangements, which allow for the use of a cloud-based software product or service over a contractually determined period of time without the customer having to take possession of software, is accounted for as a subscription and is recognized as revenue ratably, on a straight-line basis, over the subscription period beginning on the date the service is first made available to customers. For contracts with any combination of SaaS and related services, distinct performance obligations are accounted for separately. For contracts with multiple performance obligations, we allocate the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation.

Revenue from DFI systems and CV systems that do not include performance incentives based on customers’ yield achievement is recognized primarily as services are performed. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs. For those contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation on a relative basis using the SSP attributed to each performance obligation. Where there are not discrete performance obligations, historically, revenue is primarily recognized as services are performed using a percentage of completion method based on costs or labor-hours inputs, whichever is the most appropriate measure of the progress towards completion of the contract. The estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

Integrated Yield Ramp Revenue

Integrated Yield Ramp revenue is derived from the Company’s fixed-fee engagements that include performance incentives based on customers’ yield achievement (which consists primarily of Gainshare royalties) typically based on customer’s wafer shipments, pertaining to these fixed-price contracts, which royalties are variable.

Revenue under these project-based contracts, which are delivered over a specific period of time, typically for a fixed fee component paid on a set schedule, is recognized as services are performed using a percentage of completion method based on costs or labor-inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs and allocates the transaction price of the contract to each performance obligation on a relative basis using SSP. Similar to the services provided in connection with DFI systems and CV systems that are contributing to Analytics revenue, due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex and subject to many variables that require significant judgment. Please refer to the “Significant Judgments” section of this Note for further discussion.

The Gainshare royalty contained in Integrated Yield Ramp contracts is a variable fee related to continued usage of the Company’s intellectual property after the fixed-fee service period ends, based on a customer’s yield achievement. Revenue derived from Gainshare is contingent upon the Company’s customers reaching certain defined production yield levels. Gainshare royalty periods are generally subsequent to the delivery of all contractual services and performance obligations. The Company records Gainshare as a usage-based royalty derived from customers’ usage of intellectual property and records it in the same period in which the usage occurs.

Employee Stock Purchase Plan, Policy

In July 2001, the Company’s stockholders initially approved the 2001 Employee Stock Purchase Plan, which was subsequently amended and restated in 2010 (as amended, the “2010 Purchase Plan”) to extend the term of the plan through May 17, 2020. Under the 2010 Purchase Plan, eligible employees could contribute up to 10% of their compensation, as defined in the 2010 Purchase Plan, towards the purchase of shares of PDF common stock at a price of 85% of the lower of the fair market value at the beginning of the offering period or the end of the purchase period. The 2010 Purchase Plan provided for twenty-four-month offering periods with four six-month purchase periods in each offering period. The 2010 Purchase Plan expired on May 17, 2020. Existing offering periods under the 2010 Plan continued through the applicable expiration date and the final offering period expired on January 31, 2022. On June 15, 2021, the Company’s stockholders approved the 2021 Employee Stock Purchase Plan, which has a ten-year term (the “2021 Purchase Plan” and, together with the 2010 Purchase Plan, the “Employee Purchase Plans”). The terms of 2021 Purchase Plan are substantially similar to those of the 2010 Purchase Plan. A twenty-four-month offering period under the 2021 Purchase Plan commenced on August 1, 2021.

The Company estimated the fair value of purchase rights granted under the 2021 Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values:

Earnings Per Share, Policy

Basic net income (loss) per share is computed by dividing net income (loss) by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive.

Segment Reporting, Policy

The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions, allocation of resources, and assessing financial performance. Accordingly, the Company considers itself to be in one operating and reporting segment, specifically the provision of services for differentiated data and analytics solutions to the semiconductor and electronics industries.

Fair Value Measurement, Policy

Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its

own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.

Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

Recent Accounting Standards, Policy

Recent Accounting Standards

Accounting Standards Not Yet Adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires measurement and recognition of expected credit losses for financial assets held at the reporting date based on internal information, external information, or a combination of both relating to past events, current conditions, and reasonable and supportable forecasts. ASU No. 2016-13 replaces the existing incurred loss impairment model with a forward-looking expected credit loss model, which will result in earlier recognition of credit losses. Subsequent to the issuance of ASU No. 2016-13, the FASB issued ASU No. 2018-19, Codification

Improvements to Topic 326, Financial Instruments – Credit Losses, ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instrument, ASU No. 2019-05, Financial Instruments – Credit Losses (Topic 326) Targeted Transition Relief, ASU No. 2016-13, ASU No. 2019-10 Financial Instruments-Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and ASU No. 2019-11 Codification Improvements to Topic 326, Financial Instruments-Credit Losses. The subsequent ASUs do not change the core principle of the guidance in ASU No. 2016-13. Instead, these amendments are intended to clarify and improve operability of certain topics included within ASU No. 2016-13.

Additionally, ASU No. 2019-10 defers the effective date for the adoption of the new standard on credit losses for public filers that are considered small reporting companies (“SRC”) as defined by the SEC to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, which will be fiscal 2023 for the Company. In February 2020, the FASB issued ASU 2020-02, which provides guidance regarding methodologies, documentation, and internal controls related to expected credit losses. The subsequent amendments will have the same effective date and transition requirements as ASU No. 2016-13. Topic 326 requires a modified retrospective approach by recording a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. While the Company is currently evaluating the impact of Topic 326, the Company does not expect the adoption of this ASU to have a material impact on its condensed consolidated financial statements or the related disclosure.

Management has reviewed other recently issued accounting pronouncements issued or proposed by the FASB, and does not believe any of these accounting pronouncements has had or will have a material impact on the condensed consolidated financial statements.

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Note 2 - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Disaggregation of Revenue

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Over time	68		72	%	70	%	60	%
Point-in-time	32		28	%	30	%	40	%
Total	100	%	100	%	100	%	100	%

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Note 4 - BALANCE SHEET COMPONENTS (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Property, Plant and Equipment

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

	September 30,		December 31,
	2022		2021
Computer equipment	$	11,711	$	11,924
Software		5,359		5,419
Furniture, fixtures and equipment		2,467		2,506
Leasehold improvements		6,277		6,272
Laboratory and other equipment		4,340		3,981
Test equipment		28,311		24,452
Construction-in-progress		24,965		22,158
		83,430		76,712
Less: Accumulated depreciation and amortization		(44,690)		(41,417)
Total	$	38,740	$	35,295

Schedule of Finite-Lived Intangible Assets, Net

		September 30, 2022						December 31, 2021
	Amortization	Gross				Net		Gross				Net
	Period	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
	(Years)	Amount		Amortization		Amount		Amount		Amortization		Amount
Acquired identifiable intangibles:
Customer relationships	1-10	$	9,407	$	(6,524)	$	2,883	$	9,407	$	(6,041)	$	3,366
Developed technology	4-9		33,635		(19,046)		14,589		33,635		(17,250)		16,385
Tradename and trademarks	2-10		1,598		(892)		706		1,598		(812)		786
Patent	7-10		2,100		(1,674)		426		1,800		(1,640)		160
Noncompetition agreements	3		848		(518)		330		848		(306)		542
Total		$	47,588	$	(28,654)	$	18,934	$	47,288	$	(26,049)	$	21,239

Schedule of Finite-lived Intangible Assets Amortization Expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Amortization of acquired technology included under Costs of Revenues	$	553	$	456	$	1,659	$	1,525
Amortization of acquired intangible assets presented separately under Costs and Expenses		318		314		946		942
Total amortization of acquired intangible assets	$	871	$	770	$	2,605	$	2,467

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Year Ending December 31,	Amount
2022 (remaining three months)	$	879
2023		3,491
2024		3,093
2025		2,928
2026		2,759
2027 and thereafter		5,784
Total future amortization expense	$	18,934

There were no impairment charges for goodwill and intangible assets during the three and nine months ended September 30, 2022 and 2021.

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Note 5 - LEASES (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Lease Expenses

Lease expense was comprised of the following (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Operating lease expense (1)	$	375	$	448	$	1,073	$	1,417
Short-term lease and variable lease expense (2)		244		196		801		602
Total lease expense	$	619	$	644	$	1,874	$	2,019

(1) Net of gain recognized upon lease termination of $0.1 million in the nine months ended September 30, 2022.

(2) Leases with an initial term of 12 months or less are not recorded on the accompanying Condensed Consolidated Balance Sheets, and the Company recognizes lease expense for these leases on a straight-line basis over the lease term. Variable lease expense for the periods presented primarily included common area maintenance charges.

Supplemental condensed consolidated balance sheets information related to operating leases was as follows:

	September 30,			December 31,
	2022			2021
Weighted average remaining lease term under operating ROU leases (in years)		5.6			5.7
Weighted average discount rate for operating lease liabilities		4.82	%		5.25	%

Schedule of Operating Lease Liabilities and Maturities

	September 30,			December 31,
	2022			2021
Weighted average remaining lease term under operating ROU leases (in years)		5.6			5.7
Weighted average discount rate for operating lease liabilities		4.82	%		5.25	%

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Note 7 - EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Share-based Payment Awards, Stock Options, Valuation Assumptions

	Nine Months Ended September 30,
	2022			2021
Expected life (in years)		1.25			1.25
Volatility		48.73	%		48.00	%
Risk-free interest rate		2.75	%		0.11	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted during the period	$	10.00		$	6.71

Schedule of Share-based Payment Arrangement, Expensed and Capitalized Amounts

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Costs of revenues	$	854	$	670	$	2,237	$	1,860
Research and development		2,180		1,299		7,158		4,013
Selling, general and administrative		2,102		1,394		5,166		3,601
Stock-based compensation expenses	$	5,136	$	3,363	$	14,561	$	9,474

Schedule of Share-based Payment Arrangement, Options Activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
	(in thousands)	per Share		(Years)	(in thousands)
Outstanding, January 1, 2022	226	$	12.78
Granted	—		—
Exercised	(109)		9.79
Canceled	(6)		13.35
Expired	(2)		8.79
Outstanding, September 30, 2022	109	$	15.77	3.93	$	960
Vested and expected to vest, September 30, 2022	109	$	15.77	3.91	$	955
Exercisable, September 30, 2022	94	$	15.75	3.42	$	825

Schedule of Share-based Payment Arrangement, Restricted Stock Unit Activity

		Weighted
		Average Grant
	Shares	Date Fair Value
	(in thousands)	Per Share
Nonvested, January 1, 2022	1,872	$	18.24
Granted	1,144	$	22.74
Vested	(738)	$	18.13
Forfeited	(75)	$	19.41
Nonvested, September 30, 2022	2,203	$	20.57

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Note 9 - NET LOSS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	1,385	$	(2,407)	$	(3,912)	$	(14,488)
Denominator:
Basic weighted-average shares outstanding		37,226		37,221		37,285		37,067
Effect of dilutive options and restricted stock units		828		—		—		—
Diluted weighted-average shares outstanding		38,054		37,221		37,285		37,067
Net income (loss) per share – Basic	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)
Net income (loss) per share – Diluted	$	0.04	$	(0.06)	$	(0.10)	$	(0.39)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	Three Months Ended September 30,		Nine Months Ended September 30,
	2022	2021	2022	2021
Outstanding options	—	128	63	182
Nonvested restricted stock units	62	915	784	997
Employee Stock Purchase Plan	—	30	75	14
Total	62	1,073	922	1,193

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Revenue by Major Customers by Reporting Segments

The Company had revenues from individual customers that are approximately 10% or more of the Company’s consolidated total revenues as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
Customer	2022		2021		2022		2021
A	28	%	25	%	30	%	12	%
B	16	%	*	%	11	%	*	%
C	*	%	*	%	*	%	10	%

* represents less than 10%

Gross accounts receivable balances (including amounts that are unbilled) from individual customers that are approximately 10% or more of the Company’s gross accounts receivable balance as follows:

	September 30,		December 31,
Customer	2022		2021
A	27	%	29	%
B	14	%	15	%
C	18	%	*	%

* represents less than 10%

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (amounts in thousands):

	Three Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	18,292	46	%	$	13,983	47	%
China		9,555	24			4,038	14
Japan		2,818	7			2,515	9
Rest of the world		9,195	23			9,019	30
Total revenue	$	39,860	100	%	$	29,555	100	%

	Nine Months Ended September 30,
	2022				2021
			Percentage				Percentage
	Revenues		of Revenues		Revenues		of Revenues
United States	$	52,869	49	%	$	34,634	43	%
China		18,214	17			10,065	12
Japan		8,219	8			8,543	10
Rest of the world		28,724	26			27,932	35
Total revenue	$	108,026	100	%	$	81,174	100	%

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

	September 30,		December 31,
	2022		2021
United States (1)	$	43,469	$	39,158
Rest of the world		1,293		1,545
Total long-lived assets, net	$	44,762	$	40,703

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Note 11 - FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Fair Value, Assets Measured on Recurring Basis

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other
			Identical		Observable		Significant
	September 30,		Assets		Inputs		Unobservable
Assets	2022		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents
Money market mutual funds	$	70,934	$	70,934	$	—	$	—
U.S. Government securities (1)		2,994		2,994		—		—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		22,357		22,357		—		—
Total	$	96,285	$	96,285	$	—	$	—

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
Assets	2021		(Level 1)		(Level 2)		(Level 3)
Cash equivalents
Money market mutual funds	$	12,474	$	12,474	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Government securities (1)		112,542		112,542		—		—
Total	$	125,016	$	125,016	$	—	$	—

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Note 2 - REVENUE FROM CONTRACTS WITH CUSTOMERS - 1 (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Number of revenue sources | item			2
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	$ 1,900,000		$ 1,900,000		$ 400,000
Capitalized Contract Cost, Impairment Loss	0	$ 0	0	$ 0	0
Contract with Customer, Liability, Revenue Recognized	10,600,000	7,000,000.0	16,300,000	13,800,000
Revenue, Remaining Performance Obligation, Amount	185,400,000		185,400,000
Contract with Customer, Performance Obligation Satisfied in Previous Period	1,900,000	200,000	400,000	34,000
Capitalized Contract Cost, Amortization	400,000	$ 200,000	1,127,000	$ 499,000
Prepaid Expenses and Other Current Assets [Member]
Capitalized Contract Cost, Net, Total	1,400,000		1,400,000		600,000
Other Noncurrent Assets [Member]
Capitalized Contract Cost, Net, Total	$ 1,700,000		$ 1,700,000		$ 2,100,000
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]
Concentration Risk, Percentage	54.00%	53.00%	51.00%	57.00%

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Note 2 - REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative 2 (Details) - Software License and Related Services Agreement [Member] - Advantest America, Inc. [Member]	Sep. 30, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	3 years

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Note 2 - REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Percent of revenues	100.00%	100.00%	100.00%	100.00%
Transferred over Time [Member]
Percent of revenues	68.00%	72.00%	70.00%	60.00%
Transferred at Point in Time [Member]
Percent of revenues	32.00%	28.00%	30.00%	40.00%

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Note 3 - STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS (Details)		3 Months Ended		9 Months Ended
	Jul. 29, 2020 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Contract revenues		$ 39,860,000	$ 29,555,000	$ 108,026,000	$ 81,174,000
Strategic Partnership for Joint Development and Sales Technology Solutions
Stock Issued During Period, Shares, New Issues (in shares) | shares	3,306,924
Proceeds from Issuance of Common Stock	$ 65,200,000
Commercial Agreement With Advantest
Contract revenues		2,800,000	$ 2,700,000	8,100,000	$ 7,900,000
Related party receivables		10,400,000		10,400,000		$ 0
Deferred contract revenues		$ 9,100,000		$ 9,100,000		$ 6,800,000
Number contract termination events		0		0

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Note 4 - BALANCE SHEET COMPONENTS - Other (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Unbilled Receivables, Current	$ 9,800,000	$ 11,800,000		$ 9,800,000
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	1,000,000.0	1,300,000		1,000,000.0
Depreciation, Depletion and Amortization, Nonproduction, Total	1,400,000		$ 1,500,000	4,200,000	$ 4,800,000
Impairment of Intangible Assets, Finite-lived	0		0	0	0
Goodwill	14,123,000	14,123,000		14,123,000
Impairment of goodwill	0		0	0	0
Amortization of Intangible Assets, Total	871,000		770,000	$ 2,605,000	2,467,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)				6 years 7 months 6 days
Write-down in value of property and equipment		3,200,000
Cost of Sales [Member]
Amortization of Intangible Assets, Total	553,000		456,000	$ 1,659,000	1,525,000
Costs and Expenses [Member]
Amortization of Intangible Assets, Total	318,000		$ 314,000	946,000	$ 942,000
DFI Test Equipment [Member]
Construction in Progress, Gross	$ 20,100,000	$ 20,000,000.0		$ 20,100,000

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Note 4 - BALANCE SHEET COMPONENTS - Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property and equipment, gross	$ 83,430	$ 76,712
Less: accumulated depreciation and amortization	(44,690)	(41,417)
Total	38,740	35,295
Computer Equipment [Member]
Property and equipment, gross	11,711	11,924
Software and Software Development Costs [Member]
Property and equipment, gross	5,359	5,419
Furniture and Fixtures [Member]
Property and equipment, gross	2,467	2,506
Leasehold Improvements [Member]
Property and equipment, gross	6,277	6,272
Laboratory and Test Equipment [Member]
Property and equipment, gross	4,340	3,981
Test Equipment [Member]
Property and equipment, gross	28,311	24,452
Construction in Progress [Member]
Property and equipment, gross	$ 24,965	$ 22,158

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Note 4 - BALANCE SHEET COMPONENTS - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Amortization Period (Year)	6 years 7 months 6 days
Gross Carrying Amount	$ 47,588	$ 47,288
Accumulated Amortization	(28,654)	(26,049)
Net Carrying Amount	18,934
Net Carrying Amount, Total	18,934	21,239
Customer Relationships [Member]
Gross Carrying Amount	9,407	9,407
Accumulated Amortization	(6,524)	(6,041)
Net Carrying Amount	$ 2,883	3,366
Customer Relationships [Member] | Minimum [Member]
Amortization Period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 33,635	33,635
Accumulated Amortization	(19,046)	(17,250)
Net Carrying Amount	$ 14,589	16,385
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Trademarks and Trade Names [Member]
Gross Carrying Amount	$ 1,598	1,598
Accumulated Amortization	(892)	(812)
Net Carrying Amount	$ 706	786
Trademarks and Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trademarks and Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Patents [Member]
Gross Carrying Amount	$ 2,100	1,800
Accumulated Amortization	(1,674)	(1,640)
Net Carrying Amount	$ 426	160
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Noncompete Agreements [Member]
Amortization Period (Year)	3 years
Gross Carrying Amount	$ 848	848
Accumulated Amortization	(518)	(306)
Net Carrying Amount	$ 330	$ 542

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Note 4 - BALANCE SHEET COMPONENTS - Annual Amortization of Identifiable Intangible Assets (Details) $ in Thousands	Sep. 30, 2022 USD ($)
BALANCE SHEET COMPONENTS
2022 (remaining three months)	$ 879
2023	3,491
2024	3,093
2025	2,928
2026	2,759
2027 and thereafter	5,784
Net Carrying Amount	$ 18,934

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Note 5 - LEASES - Other (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) lease	Dec. 31, 2021 USD ($) lease
LEASES
Number of finance leases | lease		0	0
Operating Lease, Liability, Amount Related to Extension of Lease Term		$ 900
Operating Lease, Liability, Current		1,448	$ 1,758
Operating lease right of use assets decrease from early lease termination	$ 500
Operating lease liability decrease from early lease termination	$ 600
Lease termination gain		$ 100

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Note 5 - LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
LEASES
Operating lease expense	$ 375	$ 448	$ 1,073	$ 1,417
Short-term lease and variable lease expense	244	196	801	602
Total lease expense	$ 619	$ 644	1,874	$ 2,019
Lease termination gain			$ 100
Weighted average remaining lease term under operating ROU leases (in years) (Year)	5 years 7 months 6 days		5 years 7 months 6 days		5 years 8 months 12 days
Weighted average discount rate for operating lease liabilities	4.82%		4.82%		5.25%
Operating lease ROU assets obtained (in thousands)			$ 2,268

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Note 5 - LEASES - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2022 USD ($)
LEASES
2022 (remaining three months)	$ 400
2023	1,600
2024	1,538
2025	1,454
2026	1,355
2027 and thereafter	2,286
Total future minimum lease payments	8,633
Less: Interest (2)	(1,111)
Present value of future minimum lease payments under operating lease liabilities (3)	$ 7,522

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Note 6 - STOCKHOLDERS EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			9 Months Ended		22 Months Ended
	Apr. 11, 2022	Jun. 04, 2020	Jun. 30, 2022	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Apr. 10, 2022
Treasury Stock, Value, Acquired, Cost Method			$ 16,693	$ 5,778	$ 4,523
The 2020 Stock Repurchase Program [Member]
Treasury Stock, Shares, Acquired (in shares)						218,858	251,212	470,070
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)						$ 26.40	$ 18.01	$ 21.91
Treasury Stock, Value, Acquired, Cost Method						$ 5,800	$ 4,500	$ 10,300
Stock Repurchase Program, Authorized Amount		$ 25,000
Stock Repurchase Program, Period in Force (Year)		2 years
Stock Repurchase Program 2022 [Member]
Treasury Stock, Shares, Acquired (in shares)						714,600
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)						$ 23.36
Treasury Stock, Value, Acquired, Cost Method						$ 16,700
Stock Repurchase Program, Authorized Amount	$ 35,000
Stock Repurchase Program, Period in Force (Year)	2 years

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Note 7 - EMPLOYEE BENEFIT PLANS - Other (Details) - USD ($)			3 Months Ended		9 Months Ended		131 Months Ended	227 Months Ended
	Jun. 15, 2021	Nov. 16, 2011	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	May 16, 2020	Dec. 31, 2021	Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares)					6,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			109,000		109,000		109,000		226,000
Share Price (in dollars per share)			$ 24.53		$ 24.53		$ 24.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 1,800,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 100,000		$ 100,000		$ 100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			35,000,000.0		$ 35,000,000.0		35,000,000.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 8 months 12 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					4 years
The 2010 Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate								10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent								85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period								24 months
Number of 6-month Offering Periods								4
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period								6 months
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)					5,203	108,623
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share)						$ 9.53
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 0		$ 0		0
The 2021 Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period	24 months
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)			92,043		182,083
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share)			$ 16.40		$ 16.15
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 1,600,000		$ 1,600,000		$ 1,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			817,917		817,917		817,917
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		12,800,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in shares)		1.33
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			13,300,000		13,300,000		13,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			3,500,000		3,500,000		3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cumulative Forfeitures of Plan (in shares)							500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			0	0	0	0
Twenty Eleven Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)										3,500,000
Outside of the 2011, 2001 or IDS Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			0		0		0

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Note 7 - EMPLOYEE BENEFIT PLANS - Stock Options, Valuation Assumptions (Details) - Employee Stock Purchase Plan [Member] - $ / shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Expected life (in years) (Year)	1 year 3 months	1 year 3 months
Volatility	48.73%	48.00%
Risk-free interest rate	2.75%	0.11%
Expected dividend	0.00%
Weighted average fair value of purchase rights granted during the period (in dollars per share)	$ 10.00	$ 6.71

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Note 7 - EMPLOYEE BENEFIT PLANS - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stock-based compensation expenses	$ 5,136	$ 3,363	$ 14,561	$ 9,474
Cost of Sales [Member]
Stock-based compensation expenses	854	670	2,237	1,860
Research and Development Expense [Member]
Stock-based compensation expenses	2,180	1,299	7,158	4,013
Selling, General and Administrative Expenses [Member]
Stock-based compensation expenses	$ 2,102	$ 1,394	$ 5,166	$ 3,601

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Note 7 - EMPLOYEE BENEFIT PLANS - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2022
EMPLOYEE BENEFIT PLANS
Outstanding, beginning balance (in shares)	226
Exercised (in shares)	(109)
Canceled (in shares)	(6)
Expired (in shares)	(2)
Outstanding, ending balance (in shares)	109
Vested and expected to vest (in shares)	109
Exercisable (in shares)	94
Outstanding, weighted average exercise price, beginning balance (in dollars per share)	$ 12.78
Exercised, weighted average exercise price (in dollars per share)	9.79
Canceled, weighted average exercise price (in dollars per share)	13.35
Expired, weighted average exercise price (in dollars per share)	8.79
Outstanding, weighted average exercise price, ending balance (in dollars per share)	15.77
Vested and expected to vest, weighted average exercise price (in dollars per share)	15.77
Exercisable, weighted average exercise price (in dollars per share)	$ 15.75
Outstanding, weighted average remaining contractual (Year)	3 years 11 months 4 days
Vested and expected to vest, weighted average remaining contractual term (Year)	3 years 10 months 28 days
Exercisable, weighted average remaining contractual term (Year)	3 years 5 months 1 day
Outstanding, aggregate intrinsic value	$ 960
Vested and expected to vest, aggregate intrinsic value	955
Exercisable, aggregate intrinsic value	$ 825

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Note 7 - EMPLOYEE BENEFIT PLANS - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Nonvested, Opening Balance (in shares) | shares	1,872
Granted (in shares) | shares	1,144
Vested (in shares) | shares	(738)
Forfeited (in shares) | shares	(75)
Nonvested, Ending Balance (in shares) | shares	2,203
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.24
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	22.74
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	18.13
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	19.41
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 20.57

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Note 8 - INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
INCOME TAXES
Increase (Decrease) in Income Taxes			$ 1,800
Income Tax Expense (Benefit), Total	$ 815	$ 506	$ 3,308	$ 1,549
Effective Income Tax Rate Reconciliation, Percent, Total			547.70%	12.00%
Unrecognized Tax Benefits, Ending Balance	15,200		$ 15,200		$ 14,700
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,800		1,800		2,000
Unrecognized tax benefits including income tax penalties and interest accrued in long term liabilities	2,300		2,300
Unrecognized tax benefits related to income tax penalties and interest accrued in long-term liabilities	600		600
Unrecognized Tax Benefits In Deferred Tax Assets	13,500		13,500
Deferred Tax Assets, Valuation Allowance, Total	51,600		51,600		51,600
Net deferred tax assets	$ 16		$ 16		$ 75

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Note 9 - NET LOSS PER SHARE - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
NET LOSS PER SHARE
Net loss	$ 1,385	$ (2,407)	$ (3,912)	$ (14,488)
Basic weighted-average shares outstanding (in shares)	37,226	37,221	37,285	37,067
Effect of dilutive options and restricted stock units (in shares)	828
Diluted weighted-average shares outstanding (in shares)	38,054	37,221	37,285	37,067
Basic (in dollars per share)	$ 0.04	$ (0.06)	$ (0.10)	$ (0.39)
Diluted (in dollars per share)	$ 0.04	$ (0.06)	$ (0.10)	$ (0.39)

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Note 9 - NET LOSS PER SHARE - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Anti-dilutive securities (in shares)	62	1,073	922	1,193
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)		128	63	182
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	62	915	784	997
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)		30	75	14

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION - Other (Details)	9 Months Ended
	Sep. 30, 2022
CUSTOMER AND GEOGRAPHIC INFORMATION
Number of Operating Segments	1
Number of Reportable Segments	1

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue Benchmark [Member] | Customer A [Member]
Concentration risk	28.00%	25.00%	30.00%	12.00%
Revenue Benchmark [Member] | Customer B [Member]
Concentration risk	16.00%		11.00%
Revenue Benchmark [Member] | Customer C [Member]
Concentration risk				10.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration risk			27.00%		29.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk			14.00%		15.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration risk			18.00%

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 39,860	$ 29,555	$ 108,026	$ 81,174
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues	$ 39,860	$ 29,555	$ 108,026	$ 81,174
Concentration risk	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Revenues	$ 18,292	$ 13,983	$ 52,869	$ 34,634
Concentration risk	46.00%	47.00%	49.00%	43.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | CHINA
Revenues	$ 9,555	$ 4,038	$ 18,214	$ 10,065
Concentration risk	24.00%	14.00%	17.00%	12.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | JAPAN
Revenues	$ 2,818	$ 2,515	$ 8,219	$ 8,543
Concentration risk	7.00%	9.00%	8.00%	10.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Rest of the World [Member]
Revenues	$ 9,195	$ 9,019	$ 28,724	$ 27,932
Concentration risk	23.00%	30.00%	26.00%	35.00%

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Note 10 - CUSTOMER AND GEOGRAPHIC INFORMATION - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Long-lived assets, net	$ 44,762	$ 40,703
UNITED STATES
Long-lived assets, net	43,469	39,158
Rest of the World [Member]
Long-lived assets, net	$ 1,293	$ 1,545

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Note 11 - FAIR VALUE MEASUREMENTS - Fair Value, Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Total	$ 96,285	$ 125,016
Fair Value, Inputs, Level 1 [Member]
Total	96,285	125,016
Money Market Funds [Member]
Money market mutual funds	70,934	12,474
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	70,934	12,474
US Government Corporations and Agencies Securities [Member]
Money market mutual funds	2,994
Short-term investments	22,357	112,542
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	2,994
Short-term investments	$ 22,357	$ 112,542

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Note 12 - COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
COMMITMENTS AND CONTINGENCIES
Future Lease payments	$ 8,633
Term of Product Warranty	90 days
Purchase Obligation, Total	$ 13,700
Threshold payment period	12 months