PDF Solutions (PDFS) 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Document Information [Line Items]
Entity Central Index Key	0001120914
Entity Registrant Name	PDF SOLUTIONS INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	000-31311
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	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		36,629,905

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 118,386	$ 97,605
Short-term investments	49,983	0
Accounts receivable, net of allowance for doubtful accounts of $963 in 2020 and $213 in 2019	40,388	40,651
Prepaid expenses and other current assets	9,310	9,320
Total current assets	218,067	147,576
Property and equipment, net	39,487	40,798
Operating lease right-of-use assets, net	6,712	7,609
Goodwill	2,293	2,293
Intangible assets, net	5,269	6,221
Deferred tax assets, net	30,498	25,327
Other non-current assets	8,282	9,720
Total assets	310,608	239,544
Current liabilities:
Accounts payable	2,212	7,636
Accrued compensation and related benefits	5,396	5,072
Accrued and other current liabilities	3,001	1,665
Operating lease liabilities – current portion	1,763	1,867
Deferred revenues – current portion	19,074	10,639
Billings in excess of recognized revenues	1,430	1,117
Total current liabilities	32,876	27,996
Long-term income taxes payable	5,137	5,368
Non-current operating lease liabilities	6,764	7,677
Other non-current liabilities	(1,054)	(2,346)
Total liabilities	45,831	43,387
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized; shares issued 46,117 and 41,797, respectively; shares outstanding 36,626 and 32,503, respectively	5	5
Additional paid-in-capital	403,450	325,197
Treasury stock at cost, 9,491 and 9,294 shares, respectively	(94,992)	(91,695)
Accumulated deficit	(42,784)	(35,870)
Accumulated other comprehensive loss	(902)	(1,480)
Total stockholders’ equity	264,777	196,157
Total liabilities and stockholders’ equity	$ 310,608	$ 239,544

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts	$ 963	$ 213
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)	46,117	41,797
Common stock, shares outstanding (in shares)	36,626	32,503
Treasury stock, shares (in shares)	9,491	9,294

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues	$ 23,112	$ 21,914	$ 65,678	$ 63,023
Costs and Expenses:
Costs of revenues	9,493	8,715	26,926	24,415
Research and development	8,328	8,435	24,672	23,993
Selling, general and administrative	8,420	5,990	24,052	19,940
Amortization of other acquired intangible assets	174	174	521	436
Restructuring charges	0	0	0	92
Interest and other expense (income), net	361	(202)	530	(307)
Loss before income taxes	(3,664)	(1,198)	(11,023)	(5,546)
Income tax benefit	(930)	(511)	(4,109)	(1,458)
Net loss	(2,734)	(687)	(6,914)	(4,088)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	540	(461)	581	(477)
Change in unrealized losses related to available-for-sale debt securities, net of tax	(3)	0	(3)	0
Total other comprehensive income (loss)	537	(461)	578	(477)
Comprehensive loss	$ (2,197)	$ (1,148)	$ (6,336)	$ (4,565)
Net loss per share:
Basic (in dollars per share)	$ (0.08)	$ (0.02)	$ (0.21)	$ (0.13)
Diluted (in dollars per share)	$ (0.08)	$ (0.02)	$ (0.21)	$ (0.13)
Weighted average common shares:
Basic (in shares)	35,479	32,392	33,696	32,405
Diluted (in shares)	35,479	32,392	33,696	32,405
Analytics [Member]
Revenues:
Revenues	$ 14,346	$ 12,691	$ 42,766	$ 36,099
Integrated Yield Ramp [Member]
Revenues:
Revenues	$ 8,766	$ 9,223	$ 22,912	$ 26,924

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	$ 310,660	$ (79,142)	$ (30,452)	$ (1,276)	$ 199,795
Issuance of common stock in connection with employee stock purchase plan (in shares)	87		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	782	$ 0	0	0	782
Issuance of common stock in connection with exercise of options (in shares)	87		0
Issuance of common stock in connection with exercise of options	$ 0	518	$ 0	0	0	518
Vesting of restricted stock units (in shares)	104		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		54
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (557)	0	0	(557)
Stock-based compensation expense	0	3,469	0	0	0	3,469
Comprehensive income (loss)	$ 0	0	$ 0	(2,691)	(52)	(2,743)
Repurchases of common stock (in shares)	(314)		314
Repurchases of common stock	$ 0	0	$ (3,917)	0	0	(3,917)
Balances (in shares) at Mar. 31, 2019	32,346		8,663
Balances at Mar. 31, 2019	$ 5	315,429	$ (83,616)	(33,143)	(1,328)	197,347
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	310,660	$ (79,142)	(30,452)	(1,276)	199,795
Comprehensive income (loss)						(4,565)
Balances (in shares) at Sep. 30, 2019	32,350		9,246
Balances at Sep. 30, 2019	$ 5	322,183	$ (90,908)	(34,540)	(1,753)	194,987
Balances (in shares) at Mar. 31, 2019	32,346		8,663
Balances at Mar. 31, 2019	$ 5	315,429	$ (83,616)	(33,143)	(1,328)	197,347
Issuance of common stock in connection with exercise of options (in shares)	69		0
Issuance of common stock in connection with exercise of options	$ 0	326	$ 0	0	0	326
Vesting of restricted stock units (in shares)	176		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		72
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (918)	0	0	(918)
Stock-based compensation expense	0	2,601	0	0	0	2,601
Comprehensive income (loss)	$ 0	0	$ 0	(710)	36	(674)
Repurchases of common stock (in shares)	(300)		300
Repurchases of common stock	$ 0	0	$ (3,790)	0	0	(3,790)
Balances (in shares) at Jun. 30, 2019	32,291		9,035
Balances at Jun. 30, 2019	$ 5	318,356	$ (88,324)	(33,853)	(1,292)	194,892
Issuance of common stock in connection with employee stock purchase plan (in shares)	85		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	751	$ 0	0	0	751
Issuance of common stock in connection with exercise of options (in shares)	53		0
Issuance of common stock in connection with exercise of options	$ 0	267	$ 0	0	0	267
Vesting of restricted stock units (in shares)	92		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		40
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (524)	0	0	(524)
Stock-based compensation expense	0	2,809	0	0	0	2,809
Comprehensive income (loss)	$ 0	0	$ 0	(687)	(461)	(1,148)
Repurchases of common stock (in shares)	(171)		171
Repurchases of common stock	$ 0	0	$ (2,060)	0	0	(2,060)
Balances (in shares) at Sep. 30, 2019	32,350		9,246
Balances at Sep. 30, 2019	$ 5	322,183	$ (90,908)	(34,540)	(1,753)	194,987
Balances (in shares) at Dec. 31, 2019	32,503		9,294
Balances at Dec. 31, 2019	$ 5	325,197	$ (91,695)	(35,870)	(1,480)	196,157
Issuance of common stock in connection with employee stock purchase plan (in shares)	89		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	810	$ 0	0	0	810
Issuance of common stock in connection with exercise of options (in shares)	21		0
Issuance of common stock in connection with exercise of options	$ 0	161	$ 0	0	0	161
Vesting of restricted stock units (in shares)	182		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		93
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (1,478)	0	0	(1,478)
Stock-based compensation expense	0	3,513	0	0	0	3,513
Comprehensive income (loss)	$ 0	0	$ 0	(528)	(166)	(694)
Balances (in shares) at Mar. 31, 2020	32,795		9,387
Balances at Mar. 31, 2020	$ 5	329,681	$ (93,173)	(36,398)	(1,646)	198,469
Balances (in shares) at Dec. 31, 2019	32,503		9,294
Balances at Dec. 31, 2019	$ 5	325,197	$ (91,695)	(35,870)	(1,480)	$ 196,157
Issuance of common stock in connection with exercise of options (in shares)						177
Comprehensive income (loss)						$ (6,336)
Balances (in shares) at Sep. 30, 2020	36,626		9,491
Balances at Sep. 30, 2020	$ 5	403,450	$ (94,992)	(42,784)	(902)	264,777
Balances (in shares) at Mar. 31, 2020	32,795		9,387
Balances at Mar. 31, 2020	$ 5	329,681	$ (93,173)	(36,398)	(1,646)	198,469
Issuance of common stock in connection with exercise of options (in shares)	56		0
Issuance of common stock in connection with exercise of options	$ 0	463	$ 0	0	0	463
Vesting of restricted stock units (in shares)	131		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		52
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (795)	0	0	(795)
Stock-based compensation expense	0	3,013	0	0	0	3,013
Comprehensive income (loss)	$ 0	0	$ 0	(3,652)	207	(3,445)
Balances (in shares) at Jun. 30, 2020	32,982		9,439
Balances at Jun. 30, 2020	$ 5	333,157	$ (93,968)	(40,050)	(1,439)	197,705
Issuance of common stock in connection with employee stock purchase plan (in shares)	93		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	860	$ 0	0	0	860
Issuance of common stock in connection with exercise of options (in shares)	101		0
Issuance of common stock in connection with exercise of options	$ 0	1,210	$ 0	0	0	1,210
Vesting of restricted stock units (in shares)	143		0
Vesting of restricted stock units	$ 0	0	$ 0	0	0	0
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)	0		52
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	$ 0	0	$ (1,024)	0	0	(1,024)
Stock-based compensation expense	0	3,146	0	0	0	3,146
Comprehensive income (loss)	$ 0	0	$ 0	(2,734)	537	(2,197)
Issuance of common stock, net of issuance costs of $0.1 million (in shares)	3,307		0
Issuance of common stock, net of issuance costs of $0.1 million	$ 0	65,077	$ 0	0	0	65,077
Balances (in shares) at Sep. 30, 2020	36,626		9,491
Balances at Sep. 30, 2020	$ 5	$ 403,450	$ (94,992)	$ (42,784)	$ (902)	$ 264,777

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) $ in Millions	3 Months Ended
	Sep. 30, 2020USD ($)
Additional Paid-in Capital [Member]
Issuance costs	$ 0.1

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (2,734)	$ (687)	$ (6,914)	$ (4,088)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			5,030	4,306
Stock-based compensation expense			9,476	8,642
Amortization of acquired intangible assets			(952)	(867)
Amortization of costs capitalized to obtain revenue contracts	(100)	(100)	(367)	(344)
Adjustment to contingent consideration related to acquisition			0	36
Provision (reversal of allowance) for doubtful accounts and write-off of accounts receivable			(50)	67
Loss on disposal and write-down in carrying value of property and equipment			321	130
Accretion of discount on short-term investments			(3)	0
Deferred taxes			5,309	3,998
Changes in operating assets and liabilities:
Accounts receivable			313	16,946
Prepaid expenses and other current assets			235	(236)
Operating lease right-of-use assets			1,048	1,089
Other non-current assets			1,442	(2,937)
Accounts payable			(3,900)	(191)
Accrued compensation and related benefits			227	(431)
Accrued and other liabilities			1,568	1,393
Deferred revenues			6,928	1,482
Billings in excess of recognized revenues			313	584
Operating lease liabilities			(1,168)	(994)
Net cash provided by operating activities			10,876	23,011
Cash flows from investing activities:
Purchases of short-term investments			(49,983)	0
Purchases of property and equipment			(4,786)	(6,841)
Prepayment for the purchase of property and equipment			(579)	0
Payment for business acquisition			0	(2,660)
Cash used in investing activities			(55,348)	(9,501)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs paid			64,995	0
Proceeds from exercise of stock options			1,834	983
Proceeds from employee stock purchase plan			1,670	1,534
Payments for taxes related to net share settlement of equity awards			(3,297)	(1,898)
Repurchases of common stock			0	(9,639)
Repurchases of contingent consideration related to acquisition			0	(206)
Net cash provided by (used in) financing activities			65,202	(9,226)
Effect of exchange rate changes on cash and cash equivalents			51	(114)
Net change in cash and cash equivalents			20,781	4,170
Cash and cash equivalents, beginning of period			97,605	96,089	$ 96,089
Cash and cash equivalents, end of period	$ 118,386	$ 100,259	118,386	100,259	97,605
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes			2,188	2,454
Cash paid for amounts included in the measurement of operating lease liabilities			1,598	1,268
Supplemental disclosure of noncash information:
Stock-based compensation capitalized as software development costs			190	244
Property and equipment received and accrued in accounts payable and accrued and other liabilities			161	1,340
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment			0	1,416
Operating lease liabilities arising from obtaining right-of-use assets			151	0	$ 333
Issuance costs for common stock included in accounts payable and accrued and other liabilities			82	0
Common shares repurchased from a cashless exercise of stock options			$ 0	$ 128

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. 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 10 X. not may 10 December 31, 2019. 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 condensed consolidated balance sheet at December 31, 2019, not Reclassification of Prior Period Amounts Certain prior period amounts have been reclassified to conform to the current year presentation of reporting operating lease right-of-use assets, and operating lease liabilities on the Condensed Consolidated Statements of Cash Flows. This reclassification had no Change in Presentation In the fourth 2019, two not The change in presentation of revenue does not Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Change in Change in Previously Presentation Current Previously Presentation Current Reported Reclassification Presentation Reported Reclassification Presentation Revenues: Solutions $ 16,208 $ (16,208 ) N/A $ 46,298 $ (46,298 ) N/A Gainshare performance incentives 5,706 (5,706 ) N/A 16,725 (16,725 ) N/A Analytics N/A 12,691 $ 12,691 N/A 36,099 $ 36,099 Integrated Yield Ramp N/A 9,223 9,223 N/A 26,924 26,924 Total revenues $ 21,914 $ — $ 21,914 $ 63,023 $ — $ 63,023 Since certain costs of revenues are attributed to both Analytics and Integrated Yield Ramp revenue categories, the Company believes it is more appropriate and meaningful to present the Condensed Consolidated Statements of Comprehensive Loss under a one fourth 2019, two one not Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) 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, assumptions made in analysis of allowance for doubtful accounts, impairment of goodwill and long-lived assets, realization of deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income taxes. Actual results could differ from those estimates. The global COVID- 19 may 19 may 19 not may may Cash and Cash Equivalents and Short-term Investments The Company considers all highly liquid investments with an original maturity of 90 90 90 one The Company periodically reviews short-term investments for impairment. In the event a decline in value is determined to be other-than-temporary, an impairment loss is recognized. When determining if a decline in value is other-than-temporary, the Company takes into consideration the current market conditions, the duration and severity of and the reason for the decline, and the likelihood that it would need to sell the security prior to a recovery of par value. As of September 30, 2020, September 30, 2020. December 31, 2019, no three nine September 30, 2020. 12 Recently Adopted Accounting Standards Intangibles – Goodwill and Other In January 2017, No. 2017 04, 350 2 first 2020. January 1, 2020, not Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 No. 2018 15 January 1, 2020 no No. 2018 15. September 30, 2020, nine September 30, 2020. three nine September 30, 2020 Management has reviewed other recently issued accounting pronouncements and has determined there are not Accounting Standards Not In June 2016, No. 2016 13, 326 2016 13 No. 2016 13 No. 2016 13, No. 2018 19, 326, No. 2019 04, 326, 815, 825, No. 2019 05, 326 No. 2016 13, No. 2019 10 326 815 842 No. 2019 11 326, not No. 2016 13. No. 2016 13. Additionally, ASU No. 2019 10 December 15, 2022, 2023 February 2020, 2020 02, No. 2016 13. 326 326, not In December 2019, No. 2019 12, 740 first 2021 not In January 2020, No. 2020 01 321 323 815 321, 323, 815. 321 323 815 December 15, 2020. not In August 2020, No. 2020 16, 470 20 8150 20 December 15, 2023 not

Note 2 - Revenue From Contracts

Note 2 - Revenue From Contracts With Customers	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. The Company derives revenue from two The Company recognizes revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standard Codification (“ASC”) Topic 606, Revenue from Contracts with Customers 606” 606 The Company determines revenue recognition through the following five ● 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 standalone selling price. Analytics Revenue Analytics revenue is derived from the following primary offerings: licenses and services for Exensio Software, Exensio SaaS, DFI™ and CV® systems that do not Revenue from standalone Exensio Software is recognized depending on whether the license is perpetual or time-based. Perpetual ( one Revenue from Exensio 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 Revenue from DFI™ and CV® systems that do not not Integrated Yield Ramp Revenue The Integrated Yield Ramp revenue is derived from the Company’s fixed-fee engagements that include performance incentives based on customers’ yield achievement and Gainshare royalties, typically based on customer’s wafer shipments, pertaining to these fixed-price contracts. 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™ 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 judgement. Please refer to “Significant Judgments” section of this Note for further discussion. The Gainshare royalty contained in IYR contracts is a variable fee related to continued usage of the Company’s intellectual property after the fixed-fee service period ends, based on the customers’ 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 by timing of revenue: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Over time 55 % 70 % 56 % 67 % Point-in-time 45 % 30 % 44 % 33 % Total 100 % 100 % 100 % 100 % International revenues accounted for approximately 67% and 60% of our total revenues for the three nine September 30, 2020, three nine September 30, 2019, 11. Significant Judgments Judgments and estimates are required under ASC 606. 606 may may 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 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 not not may one may The Company is required to record Gainshare royalty revenue in the same period in which the usage occurs. Because the Company generally does not 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, 2020 December 31, 2019, not Deferred 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 September 30, 2020 December 31, 2019, three September 30, 2020 2019, nine September 30, 2020, 2019, At September 30, 2020, three two not not The adjustment to revenue recognized in the three September 30, 2020 2019 nine September 30, 2020 2019 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, 2020 December 31, 2019 September 30, 2020 December 31, 2019 three September 30, 2020 2019 nine September 30, 2020 2019 no Certain eligible initial project costs are capitalized when the costs relate directly to the contract, the costs generate or enhance resources of the Company that will be used in satisfying the performance obligation in the future, and the costs are expected to be recovered. These costs primarily consist of transition and set-up costs related to the installation of systems and processes and other deferred fulfillment costs eligible for capitalization. Capitalized costs are amortized consistent with the transfer to the customer of the services to which the asset relates and recorded as a component of cost of revenues. The Company also incurs certain direct costs to provide services in relation to the specific anticipated contracts. The Company recognizes such costs as a component of costs of revenues, the timing of which is dependent upon identification of a contract arrangement. The Company also defers costs from arrangements that required it to defer the revenues, typically due to the pattern of transfer of the performance obligations in the contract. These costs are recognized in proportion to the related revenue. At the end of the reporting period, the Company evaluates its deferred costs for their probable recoverability. The Company recognizes impairment of deferred costs when it is determined that the costs no no no September 30, 2020 December 31, 2019. September 30, 2020 December 31, 2019. Practical Expedients The Company does not one not three nine September 30, 2020 2019.

Note 3 - Strategic Partnership

Note 3 - Strategic Partnership Agreement With Advantest and Related Party Transactions	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	3. On July 29, 2020, i. Securities Purchase Agreement and Stockholder Agreement Pursuant to the Securities Purchase Agreement (“SPA”), the Company issued an aggregate of 3,306,924 shares of its common stock, par value $0.00015 per share (the “SPA Shares”), at a purchase price equal to $19.7085 per share to Advantest for aggregate gross proceeds of $65.2 million. In connection with the SPA, the Company entered into a Stockholder Agreement (the “Stockholder Agreement”) with Advantest on July 30, 2020. five five 9.9% 2.0% Pursuant to the Stockholder Agreement, for so long as a Termination Event has not 5635 There was no ii. Amendment #1 The Company entered into Amendment #1 March 25, 2020 ( #1 #1 #1 five five Revenue recognized from this agreement during the three nine September 30, 2020 $1.0 September 30, 2020. iii. Development Agreement The Company also entered into a multi-year Amended and Restated Master Development Agreement (the “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 (the “Integrated Products”) through one may may thirty 30 Costs and expenses incurred related to the Development Agreement have not three nine September 30, 2020. iv. Commercial Agreement The Company also entered into a multi-year Master Commercial Terms and Support Services Agreement (the “Commercial Agreement”) with Advantest. Pursuant to the Commercial Agreement, the Company and Advantest agreed to (i) commercialize and sell Integrated Products that are generated from the Development Agreement according to revenue sharing for each Integrated Product (as defined in the Commercial Agreement) as generally set forth in the Commercial Agreement and Integrated-Product specific revenue sharing and other terms agreed by the parties from time to time in addenda entered into thereunder; and (ii) provide technical services to support end customers’ use of the Integrated Products according to agreed-upon technical support sharing principles as set forth in the Commercial Agreement. Either party may ninety 90 No three nine September 30, 2020. The Company carries out transactions with Advantest on customary terms.

Note 4 - Balance Sheet Componen

Note 4 - Balance Sheet Components	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	4. 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 September 30, 2020, December 31, 2019, not 12 September 30, 2020, December 31, 2019, Property and equipment Property and equipment, net consist of the following (in thousands): September 30, December 31, 2020 2019 Computer equipment $ 11,385 $ 10,880 Software 5,035 4,690 Furniture, fixtures and equipment 2,433 2,395 Leasehold improvements 6,149 6,095 Laboratory and other equipment 5,013 4,933 Test equipment 24,118 22,980 Construction-in-progress 19,874 18,245 74,007 70,218 Less: accumulated depreciation and amortization (34,520 ) (29,420 ) Total $ 39,487 $ 40,798 Test equipment includes DFI™ assets at customer sites that are contributing to DFI™ revenues. The construction-in-progress balance related to construction of DFI™ assets totaled $18.5 million and $16.6 million as of September 30, 2020 December 31, 2019, three September 30, 2020 2019. nine September 30, 2020 2019 Goodwill and Intangible Assets As of September 30, 2020, December 31, 2019, Intangible assets balance was $5.3 million and $6.2 million as of September 30, 2020 December 31, 2019, September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 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 ‒ 9 $ 7,440 $ (5,270 ) $ 2,170 $ 7,440 $ (4,935 ) $ 2,505 Developed technology 4 ‒ 9 17,460 (14,669 ) 2,791 17,460 (14,101 ) 3,359 Tradename 2 ‒ 7 790 (692 ) 98 790 (673 ) 117 Patent 7 ‒ 10 1,800 (1,590 ) 210 1,800 (1,560 ) 240 Total $ 27,490 $ (22,221 ) $ 5,269 $ 27,490 $ (21,269 ) $ 6,221 The weighted average amortization period for acquired identifiable intangible assets was 5.7 years as of September 30, 2020. $0.3 three September 30, 2020 2019. nine September 30, 2020 2019 Year Ending December 31, Amount 2020 (remaining three months) $ 317 2021 1,093 2022 886 2023 886 2024 747 2025 and thereafter 1,340 Total future amortization expense $ 5,269 Intangible assets are amortized over their useful lives unless these lives are determined to be indefinite. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not three nine September 30, 2020,

Note 5 - Leases

Note 5 - Leases	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	5 . LEASES The Company leases administrative and sales offices and certain equipment under noncancellable 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 times through 2028. no September 30, 2020 December 31, 2019. Leases with an initial term of 12 not ROU assets represent the Company’s right to use an underlying asset for the lease term and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized based on the present value of remaining lease payments over the lease term. In determining the present value of lease payments, implicit rate must be used when readily determinable. As the Company’s leases do not may on a straight-line basis over the lease term. Variable lease payment amounts that cannot be determined at the commencement of the lease such as increases in lease payments based on changes in index rates or usage, and common area maintenance costs are not Lease expense was comprised of the following (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Operating lease expense $ 455 $ 463 $ 1,362 $ 1,402 Short-term lease and variable lease expense 127 130 401 333 Total lease expense $ 582 $ 593 $ 1,763 $ 1,735 Supplemental balance sheets information related to leases was as follows: September 30, December 31, 2020 2019 Weighted average remaining lease term under operating ROU leases (in years) 6.7 7.2 Weighted average discount rate for operating lease liabilities 5.24 % 5.25 % Operating lease ROU assets obtained (in thousands) $ 151 $ 333 Maturity of operating lease liabilities as of September 30, 2020, Year Ending December 31, Amount(a) 2020 (remaining three months) $ 392 2021 1,876 2022 1,626 2023 1,368 2024 1,073 2025 and thereafter 3,791 Total future minimum lease payments $ 10,126 Less: Interest(b) (1,599 ) Present value of future minimum lease payments operating lease liabilities(c) $ 8,527 (a) As of September 30, 2020, (b) Calculated using incremental borrowing interest rate for each lease. (c) Includes the current portion of operating lease liabilities of $1.8 million as of September 30, 2020.

Note 6 - Stockholders' Equity

Note 6 - Stockholders' Equity	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	6. Issuance of Common Stok On July 30, 2020, July 29, 2020. 3, Stock Repurchase Program On May 28, 2020, 2018 “2018 May 29, 2018, June 4, 2020, “2020 10b5 1 two three nine September 30, 2020, 2020 2018 three nine September 30, 2019, 2018 May 28, 2020, 2018

Note 7 - Employee Benefit Plans

Note 7 - Employee Benefit Plans	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	7. On September 30, 2020, Employee Stock Purchase Plan In July 2001, ten twenty-four four six January 1 2002, 1 2 3 May 18, 2010, May 17, 2020. June 22, 2030 not May 17, 2020. no January 31, 2022. Nine Months Ended September 30, 2020 2019 Expected life (in years) 1.25 1.25 Volatility 34.25 % 42.45 % Risk-free interest rate 1.43 % 2.24 % Expected dividend — — Weighted average fair value of purchase rights granted during the period $ 4.83 $ 4.08 During the three September 30, 2020 2019, nine September 30, 2020 2019, September 30, 2020, September 30, 2020, Stock Incentive Plans On November 16, 2011, 2011 “2011 2011 may 2001 2001, 2011 “2001 2001 November 16, 2011. 2011 no ten four Stock options granted under the 2001 ten four no may 2001 2001 As of September 30, 2020, 2011 2011 2001 2011 September 30, 2020. September 30, 2020, no 2011 2001 The Company estimated the fair value of share-based awards granted under the 2011 Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Expected life (in years) 4.45 4.46 4.45 4.46 Volatility 43.92 % 39.93 % 40.90 % 42.61 % Risk-free interest rate 0.23 % 1.40 % 0.60 % 1.99 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 6.92 $ 4.70 $ 5.75 $ 4.61 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 . Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Costs of revenues $ 790 $ 745 $ 2,582 $ 2,404 Research and development 1,148 1,062 3,613 3,681 Selling, general and administrative 1,192 925 3,281 2,557 Stock-based compensation expenses $ 3,130 $ 2,732 $ 9,476 $ 8,642 The stock-based compensation expense in the table above includes immaterial expense or credit adjustments related to cash-settled SARs granted to certain employees. The Company accounted for these awards as liability awards and the amount was included in accrued compensation and related benefits. SARs were fully exercised as of September 30, 2020. three September 30, 2020. nine September 30, 2020. $0.2 three nine September 30, 2019. Additional information with respect to options under the Stock Plans during the nine September 30, 2020, Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price per Term Value (in thousands) Share (years) (in thousands) Outstanding, January 1, 2020 745 $ 10.64 Granted (weighted average fair value of $5.75 per share) 24 $ 16.72 Exercised (177 ) $ 10.33 Canceled (43 ) $ 10.69 Expired (10 ) $ 10.06 Outstanding, September 30, 2020 539 $ 11.02 3.56 $ 4,188 Vested and expected to vest, September 30, 2020 531 $ 10.96 3.48 $ 4,158 Exercisable, September 30, 2020 433 $ 10.08 2.32 $ 3,779 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $18.71 per share as of September 30, 2020. nine September 30, 2020, As of September 30, 2020, nine September 30, 2020, Nonvested restricted stock units activity during the nine September 30, 2020, Weighted Average Grant Shares Date Fair Value (in thousands) Per Share Nonvested, January 1, 2020 1,887 $ 12.30 Granted 864 $ 21.28 Vested (652 ) $ 13.33 Forfeited (101 ) $ 12.61 Nonvested, September 30, 2020 1,998 $ 15.83 As of September 30, 2020, not

Note 8 - Restructuring Charges

Note 8 - Restructuring Charges	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	8. On September 27, 2018, October 24, 2018. From inception of the restructuring plan to September 30, 2020, September 30, 2020, not The following table summarizes the activities of restructuring liabilities under this plan (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Beginning balance $ — $ — $ — $ 244 Restructuring charges — — — 92 Cash payments — — — (336 ) Ending balance $ — $ — $ — $ —

Note 9 - Income Taxes

Note 9 - Income Taxes	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	9. Income tax benefit increased $2.6 million for the nine September 30, 2020, nine September 30, 2019. nine September 30, 2020 2019, nine September 30, 2020, 2019, March 27, 2020, December 31, 2017 January 1, 2021 five The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of September 30, 2020, December 31, 2019, September 30, 2020, The valuation allowance was approximately $11.2 million and $10.5 million as of September 30, 2020, December 31, 2019, not not 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. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open for audit, the federal and California statute of limitations remains open for all tax years since 2000 2002, not

Note 10 - Net Loss Per Share

Note 10 - Net Loss Per Share	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Earnings Per Share [Text Block]	10 . NET LOSS PER SHARE Basic net loss per share is computed by dividing net loss by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net 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 loss per share (in thousands except per share amount): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Numerator: Net loss $ (2,734 ) $ (687 ) $ (6,914 ) $ (4,088 ) Denominator: Basic weighted-average shares outstanding 35,479 32,392 33,696 32,405 Effect of dilutive options and restricted stock units — — — — Diluted weighted average shares outstanding 35,479 32,392 33,696 32,405 Net loss per share ‒ Basic $ (0.08 ) $ (0.02 ) $ (0.21 ) $ (0.13 ) Net loss per share ‒ Diluted $ (0.08 ) $ (0.02 ) $ (0.21 ) $ (0.13 ) For the three nine September 30, 2020 2019, The following table sets forth potential shares of common stock that are not Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Outstanding options 310 525 362 584 Nonvested restricted stock units 1,084 1,394 820 985 Employee Stock Purchase Plan 190 53 146 150 Total 1,584 1,972 1,328 1,719

Note 11 - Customer and Geograph

Note 11 - Customer and Geographic Information	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	11 . 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 The Company had revenues from individual customers in excess of 10% Three Months Ended September 30, Nine Months Ended September 30, Customer 2020 2019 2020 2019 A 18 % 22 % 23 % 30 % B * % 16 % * % * % E 15 % * % * % * % __________________________ * represents less than 10% The Company had gross accounts receivable from individual customers in excess of 10% September 30, December 31, Customer 2020 2019 A 11 % 27 % B * % 14 % C 10 % 12 % D 21 % * % __________________________ * 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, 2020 2019 Percentage Percentage Revenues of Revenues Revenues of Revenues United States $ 7,710 33 % $ 7,341 34 % China 6,747 29 5,118 23 Japan 1,113 5 2,423 11 Rest of the world 7,542 33 7,032 32 Total revenue $ 23,112 100 % $ 21,914 100 % Nine Months Ended September 30, 2020 2019 Percentage Percentage Revenues of Revenues Revenues of Revenues United States $ 26,242 40 % $ 25,203 40 % China 10,200 16 11,369 18 Taiwan 8,038 12 6,041 10 Rest of the world 21,198 32 20,410 32 Total revenue $ 65,678 100 % $ 63,023 100 % Long-lived assets, net by geographic area are as follows (in thousands): September 30, December 31, 2020 2019 United States $ 44,140 $ 46,000 Rest of the world 2,059 2,407 Total long-lived assets, net $ 46,199 $ 48,407

Note 12 - Fair Value Measuremen

Note 12 - Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	12 . 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 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 Level 3 Inputs are derived from valuation techniques in which one The following table represents the Company’s assets measured at fair value on a recurring basis as of September 30, 2020, Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs Assets Total (Level 1) (Level 2) (Level 3) Cash equivalents Money market mutual funds $ 102,977 $ 102,977 $ — $ — Short-term investments (available-for-sale debt securities) U.S. Treasury bills (1) 49,983 49,983 — — Total $ 152,960 $ 152,960 $ — $ — __________________________ ( 1 The carrying amount of the Company’s investments in U.S. Treasury bills approximate fair value due to their short-term maturities, and there have been no September 30, 2020. The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2019, Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs Assets Total (Level 1) (Level 2) (Level 3) Cash equivalents Money market mutual funds $ 27,644 $ 27,644 $ — $ — From time to time, the Company enters into foreign currency forward contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities, primarily on third not not Therefore, the change in fair value of these contracts is recorded into earnings as a component of other expense (income), net, and offsets the change in fair value of the foreign currency denominated assets and liabilities, which is also recorded in other expense (income), net in the Company’s Condensed Consolidated Statements of Operations and Comprehensive Loss. For the three September 30, 2020, no three September 30, 2019, nine September 30, 2020 2019, The Company carries these derivatives financial instruments on its Condensed Consolidated Balance Sheets at their fair values. The Company’s foreign currency forward contracts are classified as Level 2 not September 30, 2020 December 31, 2019, no

Note 13 - Commitments and Conti

Note 13 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	13 . COMMITMENTS AND CONTINGENCIES Strategic Partnership with Advantest 3 Operating Leases 5, Indemnifications 90 third not Purchase obligations September 30, 2020, 15 Indemnification of Officers and Directors 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 may not Legal Proceedings September 30, 2020, not no no On May 6, 2020,

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	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 10 X. not may 10 December 31, 2019. 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 condensed consolidated balance sheet at December 31, 2019, not
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassification of Prior Period Amounts Certain prior period amounts have been reclassified to conform to the current year presentation of reporting operating lease right-of-use assets, and operating lease liabilities on the Condensed Consolidated Statements of Cash Flows. This reclassification had no
Change in Presentation [Policy Text Block]	Change in Presentation In the fourth 2019, two not The change in presentation of revenue does not Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Change in Change in Previously Presentation Current Previously Presentation Current Reported Reclassification Presentation Reported Reclassification Presentation Revenues: Solutions $ 16,208 $ (16,208 ) N/A $ 46,298 $ (46,298 ) N/A Gainshare performance incentives 5,706 (5,706 ) N/A 16,725 (16,725 ) N/A Analytics N/A 12,691 $ 12,691 N/A 36,099 $ 36,099 Integrated Yield Ramp N/A 9,223 9,223 N/A 26,924 26,924 Total revenues $ 21,914 $ — $ 21,914 $ 63,023 $ — $ 63,023 Since certain costs of revenues are attributed to both Analytics and Integrated Yield Ramp revenue categories, the Company believes it is more appropriate and meaningful to present the Condensed Consolidated Statements of Comprehensive Loss under a one fourth 2019, two one not
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) 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, assumptions made in analysis of allowance for doubtful accounts, impairment of goodwill and long-lived assets, realization of deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income taxes. Actual results could differ from those estimates. The global COVID- 19 may 19 may 19 not may may
Cash, Cash Equivalents, and Short-term Investments, Policy [Policy Text Block]	Cash and Cash Equivalents and Short-term Investments The Company considers all highly liquid investments with an original maturity of 90 90 90 one The Company periodically reviews short-term investments for impairment. In the event a decline in value is determined to be other-than-temporary, an impairment loss is recognized. When determining if a decline in value is other-than-temporary, the Company takes into consideration the current market conditions, the duration and severity of and the reason for the decline, and the likelihood that it would need to sell the security prior to a recovery of par value. As of September 30, 2020, September 30, 2020. December 31, 2019, no three nine September 30, 2020. 12
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards Intangibles – Goodwill and Other In January 2017, No. 2017 04, 350 2 first 2020. January 1, 2020, not Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 No. 2018 15 January 1, 2020 no No. 2018 15. September 30, 2020, nine September 30, 2020. three nine September 30, 2020 Management has reviewed other recently issued accounting pronouncements and has determined there are not Accounting Standards Not In June 2016, No. 2016 13, 326 2016 13 No. 2016 13 No. 2016 13, No. 2018 19, 326, No. 2019 04, 326, 815, 825, No. 2019 05, 326 No. 2016 13, No. 2019 10 326 815 842 No. 2019 11 326, not No. 2016 13. No. 2016 13. Additionally, ASU No. 2019 10 December 15, 2022, 2023 February 2020, 2020 02, No. 2016 13. 326 326, not In December 2019, No. 2019 12, 740 first 2021 not In January 2020, No. 2020 01 321 323 815 321, 323, 815. 321 323 815 December 15, 2020. not In August 2020, No. 2020 16, 470 20 8150 20 December 15, 2023 not

Note 1 - Basis of Presentatio_2

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]	Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Change in Change in Previously Presentation Current Previously Presentation Current Reported Reclassification Presentation Reported Reclassification Presentation Revenues: Solutions $ 16,208 $ (16,208 ) N/A $ 46,298 $ (46,298 ) N/A Gainshare performance incentives 5,706 (5,706 ) N/A 16,725 (16,725 ) N/A Analytics N/A 12,691 $ 12,691 N/A 36,099 $ 36,099 Integrated Yield Ramp N/A 9,223 9,223 N/A 26,924 26,924 Total revenues $ 21,914 $ — $ 21,914 $ 63,023 $ — $ 63,023

Note 2 - Revenue From Contrac_2

Note 2 - Revenue From Contracts With Customers (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Over time 55 % 70 % 56 % 67 % Point-in-time 45 % 30 % 44 % 33 % Total 100 % 100 % 100 % 100 %

Note 4 - Balance Sheet Compon_2

Note 4 - Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Property, Plant and Equipment [Table Text Block]	September 30, December 31, 2020 2019 Computer equipment $ 11,385 $ 10,880 Software 5,035 4,690 Furniture, fixtures and equipment 2,433 2,395 Leasehold improvements 6,149 6,095 Laboratory and other equipment 5,013 4,933 Test equipment 24,118 22,980 Construction-in-progress 19,874 18,245 74,007 70,218 Less: accumulated depreciation and amortization (34,520 ) (29,420 ) Total $ 39,487 $ 40,798
Schedule of Finite-Lived Intangible Assets [Table Text Block]	September 30, 2020 December 31, 2019 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 ‒ 9 $ 7,440 $ (5,270 ) $ 2,170 $ 7,440 $ (4,935 ) $ 2,505 Developed technology 4 ‒ 9 17,460 (14,669 ) 2,791 17,460 (14,101 ) 3,359 Tradename 2 ‒ 7 790 (692 ) 98 790 (673 ) 117 Patent 7 ‒ 10 1,800 (1,590 ) 210 1,800 (1,560 ) 240 Total $ 27,490 $ (22,221 ) $ 5,269 $ 27,490 $ (21,269 ) $ 6,221
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year Ending December 31, Amount 2020 (remaining three months) $ 317 2021 1,093 2022 886 2023 886 2024 747 2025 and thereafter 1,340 Total future amortization expense $ 5,269

Note 5 - Leases (Tables)

Note 5 - Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Lease, Cost [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Operating lease expense $ 455 $ 463 $ 1,362 $ 1,402 Short-term lease and variable lease expense 127 130 401 333 Total lease expense $ 582 $ 593 $ 1,763 $ 1,735 September 30, December 31, 2020 2019 Weighted average remaining lease term under operating ROU leases (in years) 6.7 7.2 Weighted average discount rate for operating lease liabilities 5.24 % 5.25 % Operating lease ROU assets obtained (in thousands) $ 151 $ 333
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year Ending December 31, Amount(a) 2020 (remaining three months) $ 392 2021 1,876 2022 1,626 2023 1,368 2024 1,073 2025 and thereafter 3,791 Total future minimum lease payments $ 10,126 Less: Interest(b) (1,599 ) Present value of future minimum lease payments operating lease liabilities(c) $ 8,527

Note 7 - Employee Benefit Pla_2

Note 7 - Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Nine Months Ended September 30, 2020 2019 Expected life (in years) 1.25 1.25 Volatility 34.25 % 42.45 % Risk-free interest rate 1.43 % 2.24 % Expected dividend — — Weighted average fair value of purchase rights granted during the period $ 4.83 $ 4.08 Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Expected life (in years) 4.45 4.46 4.45 4.46 Volatility 43.92 % 39.93 % 40.90 % 42.61 % Risk-free interest rate 0.23 % 1.40 % 0.60 % 1.99 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 6.92 $ 4.70 $ 5.75 $ 4.61
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Costs of revenues $ 790 $ 745 $ 2,582 $ 2,404 Research and development 1,148 1,062 3,613 3,681 Selling, general and administrative 1,192 925 3,281 2,557 Stock-based compensation expenses $ 3,130 $ 2,732 $ 9,476 $ 8,642
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price per Term Value (in thousands) Share (years) (in thousands) Outstanding, January 1, 2020 745 $ 10.64 Granted (weighted average fair value of $5.75 per share) 24 $ 16.72 Exercised (177 ) $ 10.33 Canceled (43 ) $ 10.69 Expired (10 ) $ 10.06 Outstanding, September 30, 2020 539 $ 11.02 3.56 $ 4,188 Vested and expected to vest, September 30, 2020 531 $ 10.96 3.48 $ 4,158 Exercisable, September 30, 2020 433 $ 10.08 2.32 $ 3,779
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Weighted Average Grant Shares Date Fair Value (in thousands) Per Share Nonvested, January 1, 2020 1,887 $ 12.30 Granted 864 $ 21.28 Vested (652 ) $ 13.33 Forfeited (101 ) $ 12.61 Nonvested, September 30, 2020 1,998 $ 15.83

Note 8 - Restructuring Charges

Note 8 - Restructuring Charges (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Beginning balance $ — $ — $ — $ 244 Restructuring charges — — — 92 Cash payments — — — (336 ) Ending balance $ — $ — $ — $ —

Note 10 - Net Loss Per Share (T

Note 10 - Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Numerator: Net loss $ (2,734 ) $ (687 ) $ (6,914 ) $ (4,088 ) Denominator: Basic weighted-average shares outstanding 35,479 32,392 33,696 32,405 Effect of dilutive options and restricted stock units — — — — Diluted weighted average shares outstanding 35,479 32,392 33,696 32,405 Net loss per share ‒ Basic $ (0.08 ) $ (0.02 ) $ (0.21 ) $ (0.13 ) Net loss per share ‒ Diluted $ (0.08 ) $ (0.02 ) $ (0.21 ) $ (0.13 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Outstanding options 310 525 362 584 Nonvested restricted stock units 1,084 1,394 820 985 Employee Stock Purchase Plan 190 53 146 150 Total 1,584 1,972 1,328 1,719

Note 11 - Customer and Geogra_2

Note 11 - Customer and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, Customer 2020 2019 2020 2019 A 18 % 22 % 23 % 30 % B * % 16 % * % * % E 15 % * % * % * % September 30, December 31, Customer 2020 2019 A 11 % 27 % B * % 14 % C 10 % 12 % D 21 % * %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Three Months Ended September 30, 2020 2019 Percentage Percentage Revenues of Revenues Revenues of Revenues United States $ 7,710 33 % $ 7,341 34 % China 6,747 29 5,118 23 Japan 1,113 5 2,423 11 Rest of the world 7,542 33 7,032 32 Total revenue $ 23,112 100 % $ 21,914 100 % Nine Months Ended September 30, 2020 2019 Percentage Percentage Revenues of Revenues Revenues of Revenues United States $ 26,242 40 % $ 25,203 40 % China 10,200 16 11,369 18 Taiwan 8,038 12 6,041 10 Rest of the world 21,198 32 20,410 32 Total revenue $ 65,678 100 % $ 63,023 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	September 30, December 31, 2020 2019 United States $ 44,140 $ 46,000 Rest of the world 2,059 2,407 Total long-lived assets, net $ 46,199 $ 48,407

Note 12 - Fair Value Measurem_2

Note 12 - Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs Assets Total (Level 1) (Level 2) (Level 3) Cash equivalents Money market mutual funds $ 102,977 $ 102,977 $ — $ — Short-term investments (available-for-sale debt securities) U.S. Treasury bills (1) 49,983 49,983 — — Total $ 152,960 $ 152,960 $ — $ — Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs Assets Total (Level 1) (Level 2) (Level 3) Cash equivalents Money market mutual funds $ 27,644 $ 27,644 $ — $ —

Note 1 - Basis of Presentatio_3

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Short-term Investments, Total	$ 49,983	$ 49,983	$ 0
Gain (Loss) on Investments, Total	0	0
Other than Temporary Impairment Losses, Investments, Total	0	0
Other Noncurrent Assets [Member]
Capitalized Computer Software, Net, Ending Balance	$ 200	$ 200

Note 1 - Basis of Presentatio_4

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies - Reclassification of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 23,112	$ 21,914	$ 65,678	$ 63,023
Previously Reported [Member]
Revenues		21,914		63,023
Revision of Prior Period, Adjustment [Member]
Revenues		0		0
Design-For-Inspection Solutions [Member] | Previously Reported [Member]
Revenues		16,208		46,298
Design-For-Inspection Solutions [Member] | Revision of Prior Period, Adjustment [Member]
Revenues		(16,208)		(46,298)
Gainshare Performance Incentives [Member] | Previously Reported [Member]
Revenues		5,706		16,725
Gainshare Performance Incentives [Member] | Revision of Prior Period, Adjustment [Member]
Revenues		(5,706)		(16,725)
Analytics [Member]
Revenues	14,346	12,691	42,766	36,099
Analytics [Member] | Revision of Prior Period, Adjustment [Member]
Revenues		12,691		36,099
Integrated Yield Ramp [Member]
Revenues	$ 8,766	9,223	$ 22,912	26,924
Integrated Yield Ramp [Member] | Revision of Prior Period, Adjustment [Member]
Revenues		$ 9,223		$ 26,924

Note 2 - Revenue From Contrac_3

Note 2 - Revenue From Contracts With Customers 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Oct. 02, 20
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0	$ 0	$ 0
Contract with Customer, Liability, Noncurrent					$ 2,300	$ 800
Contract with Customer, Liability, Revenue Recognized	4,700	4,400	9,500	13,000
Revenue, Remaining Performance Obligation, Amount	113,200		113,200
Contract with Customer, Performance Obligation Satisfied in Previous Period	(1,200)	300	400	100
Capitalized Contract Cost, Amortization	100	$ 100	367	$ 344
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	3,800		3,800		3,600
Capitalized Contract Cost, Net, Total					400
Deferred Costs, Total					300
Other Noncurrent Assets [Member]
Capitalized Contract Cost, Net, Total	$ 1,200		$ 1,200		400
Deferred Costs, Total					$ 200
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Countries other than the United States [Member]
Concentration Risk, Percentage	67.00%	66.00%	60.00%	60.00%

Note 2 - Revenue From Contrac_4

Note 2 - Revenue From Contracts With Customers 2 (Details Textual)	Sep. 30, 2020
Minimum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	2 years

Note 2 - Revenue From Contrac_5

Note 2 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Percent of revenues	100.00%	100.00%	100.00%	100.00%
Transferred over Time [Member]
Percent of revenues	55.00%	70.00%	56.00%	67.00%
Transferred at Point in Time [Member]
Percent of revenues	45.00%	30.00%	44.00%	33.00%

Note 3 - Strategic Partnershi_2

Note 3 - Strategic Partnership Agreement With Advantest and Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jul. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.00015		$ 0.00015		$ 0.00015
Proceeds from Issuance of Common Stock				$ 64,995	$ 0
Revenue from Contract with Customer, Including Assessed Tax		$ 23,112	$ 21,914	65,678	$ 63,023
Strategic Partnership for Joint Development and Sales Technology Solutions [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,306,924
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.00015
Shares Issued, Price Per Share (in dollars per share)	$ 19.7085
Proceeds from Issuance of Common Stock	$ 65,200
Stock Issuance, Lock-up Period (Year)	5 years
Stock Issuance, Standstill Period (Year)	5 years
Software Platform Subscription, Term (Year)	5 years
Amendment #1 to Software License & Related Services Agreement [Member]
Software License Agreement, Aggregate Subscription Price		50,000		50,000
Revenue from Contract with Customer, Including Assessed Tax		1,000		1,000
Related Party Transaction, Due from (to) Related Party, Total		9,000		9,000
Contract with Customer, Liability, Total		8,000		8,000
Commercial Agreement With Advantest [Member]
Costs and Expenses, Related Party		$ 0		$ 0

Note 4 - Balance Sheet Compon_3

Note 4 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Unbilled Receivables, Current	$ 6,600		$ 6,600		$ 7,400
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	2,300		2,300		4,100
Construction in Progress, Gross	18,500		18,500		16,600
Depreciation, Depletion and Amortization, Nonproduction, Total	1,700		5,000	$ 4,300
Goodwill, Ending Balance	2,293		2,293		2,293
Finite-Lived Intangible Assets, Net, Ending Balance	5,269		$ 5,269		$ 6,221
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)			5 years 8 months 12 days
Amortization of Intangible Assets, Total	300	$ 300	$ 1,000	$ 900
Impairment of Intangible Assets, Finite-lived	$ 0		$ 0

Note 4 - Balance Sheet Compon_4

Note 4 - Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property and equipment, gross	$ 74,007	$ 70,218
Less: accumulated depreciation and amortization	(34,520)	(29,420)
Total	39,487	40,798
Computer Equipment [Member]
Property and equipment, gross	11,385	10,880
Software and Software Development Costs [Member]
Property and equipment, gross	5,035	4,690
Furniture and Fixtures [Member]
Property and equipment, gross	2,433	2,395
Leasehold Improvements [Member]
Property and equipment, gross	6,149	6,095
Laboratory and Test Equipment [Member]
Property and equipment, gross	5,013	4,933
Test Equipment [Member]
Property and equipment, gross	24,118	22,980
Construction in Progress [Member]
Property and equipment, gross	$ 19,874	$ 18,245

Note 4 - Balance Sheet Compon_5

Note 4 - Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Gross Carrying Amount	$ 27,490	$ 27,490
Accumulated Amortization	(22,221)	(21,269)
Finite-Lived Intangible Assets, Net, Ending Balance	5,269	6,221
Customer Relationships [Member]
Gross Carrying Amount	7,440	7,440
Accumulated Amortization	(5,270)	(4,935)
Finite-Lived Intangible Assets, Net, Ending Balance	$ 2,170	2,505
Customer Relationships [Member] | Minimum [Member]
Amortization period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization period (Year)	9 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 17,460	17,460
Accumulated Amortization	(14,669)	(14,101)
Finite-Lived Intangible Assets, Net, Ending Balance	$ 2,791	3,359
Developed Technology Rights [Member] | Minimum [Member]
Amortization period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization period (Year)	9 years
Trade Names [Member]
Gross Carrying Amount	$ 790	790
Accumulated Amortization	(692)	(673)
Finite-Lived Intangible Assets, Net, Ending Balance	$ 98	117
Trade Names [Member] | Minimum [Member]
Amortization period (Year)	2 years
Trade Names [Member] | Maximum [Member]
Amortization period (Year)	7 years
Patents [Member]
Gross Carrying Amount	$ 1,800	1,800
Accumulated Amortization	(1,590)	(1,560)
Finite-Lived Intangible Assets, Net, Ending Balance	$ 210	$ 240
Patents [Member] | Minimum [Member]
Amortization period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization period (Year)	10 years

Note 4 - Balance Sheet Compon_6

Note 4 - Balance Sheet Components - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
2020 (remaining three months)	$ 317
2021	1,093
2022	886
2023	886
2024	747
2025 and thereafter	1,340
Total future amortization expense	$ 5,269	$ 6,221

Note 5 - Leases (Details Textua

Note 5 - Leases (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Lease, Liability, Total	$ 1,000
Operating Lease, Liability, Current	$ 1,763	$ 1,867

Note 5 - Leases - Lease Cost (D

Note 5 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating lease expense	$ 455	$ 463	$ 1,362	$ 1,402
Short-term lease and variable lease expense	127	130	401	333
Total lease expense	$ 582	$ 593	$ 1,763	1,735
Weighted average remaining lease term under operating ROU leases (in years) (Year)	6 years 8 months 12 days		6 years 8 months 12 days		7 years 2 months 12 days
Weighted average discount rate for operating lease liabilities	5.24%		5.24%		5.25%
Operating lease liabilities arising from obtaining right-of-use assets			$ 151	$ 0	$ 333

Note 5 - Leases - Maturity of O

Note 5 - Leases - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2020USD ($)
2020 (remaining three months)	$ 392	[1]
2021	1,876	[1]
2022	1,626	[1]
2023	1,368	[1]
2024	1,073
2025 and thereafter	3,791	[1]
Total future minimum lease payments	10,126	[1]
Less: Interest(b)	(1,599)	[1],[2]
Present value of future minimum lease payments operating lease liabilities(c)	$ 8,527	[1],[3]
[1]	As of September 30, 2020, the total operating lease liability includes approximately $1.0 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 $1.8 million as of September 30, 2020.

Note 6 - Stockholders' Equity (

Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jul. 30, 2020	May 29, 2018	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	May 28, 2020
Proceeds from Issuance of Common Stock							$ 64,995	$ 0
Treasury Stock, Value, Acquired, Cost Method				$ 2,060	$ 3,790	$ 3,917
The 2018 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount		$ 25,000
Treasury Stock, Shares, Acquired (in shares)			0	171,000			0	785,000	786,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)									$ 12.43
Treasury Stock, Value, Acquired, Cost Method									$ 9,800
The 2020 Stock Repurchase Program [Member]
Stock Repurchase Program, Period in Force (Year)		2 years
Treasury Stock, Shares, Acquired (in shares)			0				0
Strategic Partnership for Joint Development and Sales Technology Solutions [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,306,924
Shares Issued, Price Per Share (in dollars per share)	$ 19.7085
Proceeds from Issuance of Common Stock	$ 65,200
Payments of Stock Issuance Costs	$ 100
Software Platform Subscription, Term (Year)	3 years

Note 7 - Employee Benefit Pla_3

Note 7 - Employee Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Nov. 16, 2011	Jul. 31, 2001	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2001	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)					43,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			539,000		539,000			745,000
Share-based Payment Arrangement, Amount Capitalized					$ 190	$ 244
Share Price (in dollars per share)			$ 18.71		$ 18.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 1,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					200
Software Development [Member]
Share-based Payment Arrangement, Amount Capitalized			$ 0	$ 200	200	$ 200
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			500		$ 500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 25,100		$ 25,100
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, Expiration Period (Year)		10 years
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%
ESPP Maximum Annual Share Replenishment (in shares)		675,000
ESPP Maximum Annual Share Replenishment Percentage of Prior Year Outstanding Company Common Stock		2.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)			93,000	85,000	183,000	172,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased (in dollars per share)					$ 9.12	$ 8.92
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 300		$ 300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					7 months 6 days
Number Of ESPP Shares Available For Future Issuance (in shares)			5,700,000		5,700,000
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	11,550,000
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)			12,100,000		12,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			4,100,000		4,100,000
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
IDS 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
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)					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

Note 7 - Employee Benefit Pla_4

Note 7 - Employee Benefit Plans - Stock Options, Valuation Assumptions (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Employee Stock Purchase Plan [Member]
Expected life (Year)			1 year 3 months	1 year 3 months
Volatility			34.25%	42.45%
Risk-free interest rate			1.43%	2.24%
Expected dividend			0.00%	0.00%
Weighted average fair value of purchase rights granted during the period (in dollars per share)			$ 4.83	$ 4.08
Twenty Eleven Stock Incentive Plan [Member]
Expected life (in years) (Year)	4 years 5 months 12 days	4 years 5 months 15 days	4 years 5 months 12 days	4 years 5 months 15 days
Volatility	43.92%	39.93%	40.90%	42.61%
Risk-free interest rate	0.23%	1.40%	0.60%	1.99%
Expected dividend	0.00%	0.00%	0.00%	0.00%
Weighted average fair value per share of options granted during the period (in dollars per share)	$ 6.92	$ 4.70	$ 5.75	$ 4.61

Note 7 - Employee Benefit Pla_5

Note 7 - Employee Benefit Plans - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-based compensation expenses	$ 3,130	$ 2,732	$ 9,476	$ 8,642
Cost of Sales [Member]
Stock-based compensation expenses	790	745	2,582	2,404
Research and Development Expense [Member]
Stock-based compensation expenses	1,148	1,062	3,613	3,681
Selling, General and Administrative Expenses [Member]
Stock-based compensation expenses	$ 1,192	$ 925	$ 3,281	$ 2,557

Note 7 - Employee Benefit Pla_6

Note 7 - Employee Benefit Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	9 Months Ended
	Sep. 30, 2020
Outstanding (in shares)	745
Outstanding, weighted average exercise price (in dollars per share)	$ 10.64
Granted (weighted average fair value of $5.75 per share) (in shares)	24
Granted (weighted average fair value of $5.75 per share) (in dollars per share)	$ 16.72
Exercised (in shares)	(177)
Exercised, weighted average exercise price (in dollars per share)	$ 10.33
Canceled (in shares)	(43)
Canceled, weighted average exercise price (in dollars per share)	$ 10.69
Expired (in shares)	(10)
Expired, weighted average exercise price (in dollars per share)	$ 10.06
Outstanding, weighted average exercise price (in dollars per share)	$ 11.02
Outstanding, weighted average remaining contractual (Year)	3 years 6 months 21 days
Outstanding, aggregate intrinsic value	$ 4,188
Vested and expected to vest (in shares)	531
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.96
Vested and expected to vest, weighted average remaining contractual term (Year)	3 years 5 months 23 days
Vested and expected to vest, aggregate intrinsic value	$ 4,158,000
Exercisable (in shares)	433
Exercisable, weighted average exercise price (in dollars per share)	$ 10.08
Exercisable, weighted average remaining contractual term (Year)	2 years 3 months 25 days
Exercisable, aggregate intrinsic value	$ 3,779,000

Note 7 - Employee Benefit Pla_7

Note 7 - Employee Benefit Plans - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2020$ / sharesshares
Nonvested, Balance (in shares) | shares	1,887
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.30
Granted (in shares) | shares	864
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 21.28
Vested (in shares) | shares	(652)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.33
Forfeited (in shares) | shares	(101)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.61
Nonvested, Balance (in shares) | shares	1,998
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 15.83

Note 8 - Restructuring Charge_2

Note 8 - Restructuring Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		24 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Restructuring Charges, Total	$ 0	$ 0	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Restructuring Charges, Total	$ 0	$ 0	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member] | Employee Severance [Member]
Restructuring Charges, Total					$ 700

Note 8 - Restructuring Charge_3

Note 8 - Restructuring Charges - Restructuring Liability Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring charges	$ 0	$ 0	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Beginning balance	0	0	0	244
Restructuring charges	0	0	0	92
Cash payments	0	0	0	(336)
Ending balance	$ 0	$ 0	$ 0	$ 0

Note 9 - Income Taxes (Details

Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Increase (Decrease) in Income Taxes			$ 2,600
Income Tax Expense (Benefit), Total	$ (930)	$ (511)	$ (4,109)	$ (1,458)
Effective Income Tax Rate Reconciliation, Percent, Total			37.00%	26.00%
Unrecognized Tax Benefits, Ending Balance	14,100		$ 14,100		$ 13,600
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8,000		8,000		7,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	2,800		2,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued in Long Term Liabilities	800		800
Unrecognized Tax Benefits In Deferred Tax Assets	12,000		12,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	6,100		6,100
Deferred Tax Assets, Valuation Allowance, Total	$ 11,200		$ 11,200		$ 10,500

Note 10 - Net Loss Per Share -

Note 10 - 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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net loss	$ (2,734)	$ (687)	$ (6,914)	$ (4,088)
Basic weighted-average shares outstanding (in shares)	35,479	32,392	33,696	32,405
Effect of dilutive options and restricted stock units (in shares)	0	0	0	0
Diluted weighted average shares outstanding (in shares)	35,479	32,392	33,696	32,405
Basic (in dollars per share)	$ (0.08)	$ (0.02)	$ (0.21)	$ (0.13)
Diluted (in dollars per share)	$ (0.08)	$ (0.02)	$ (0.21)	$ (0.13)

Note 10 - Net Loss Per Share _2

Note 10 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Anti-dilutive securities (in shares)	1,584	1,972	1,328	1,719
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	310	525	362	584
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	1,084	1,394	820	985
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)	190	53	146	150

Note 11 - Customer and Geogra_3

Note 11 - Customer and Geographic Information (Details Textual)	9 Months Ended
	Sep. 30, 2020
Number of Operating Segments	1
Number of Reportable Segments	1

Note 11 - Customer and Geogra_4

Note 11 - 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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]
Concentration risk	18.00%	22.00%	23.00%	30.00%
Revenue Benchmark [Member] | Customer B [Member]
Concentration risk		16.00%
Revenue Benchmark [Member] | Customer E [Member]
Concentration risk	15.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration risk			11.00%		27.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk					14.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration risk			10.00%		12.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration risk			21.00%

Note 11 - Customer and Geogra_5

Note 11 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 23,112	$ 21,914	$ 65,678	$ 63,023
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues	$ 23,112	$ 21,914	$ 65,678
Concentration risk	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Revenues	$ 7,710	$ 7,341	$ 26,242	$ 25,203
Concentration risk	33.00%	34.00%	40.00%	40.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | CHINA
Revenues	$ 6,747	$ 5,118	$ 10,200	$ 11,369
Concentration risk	29.00%	23.00%	16.00%	18.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | TAIWAN, PROVINCE OF CHINA
Revenues	$ 1,113	$ 2,423	$ 8,038	$ 6,041
Concentration risk	5.00%	11.00%	12.00%	10.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Rest of the World [Member]
Revenues	$ 7,542	$ 7,032	$ 21,198	$ 20,410
Concentration risk	33.00%	32.00%	32.00%	32.00%

Note 11 - Customer and Geogra_6

Note 11 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long-lived assets, net	$ 46,199	$ 48,407
UNITED STATES
Long-lived assets, net	44,140	46,000
Rest of the World [Member]
Long-lived assets, net	$ 2,059	$ 2,407

Note 12 - Fair Value Measurem_3

Note 12 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ 0	$ 400	$ 200	$ 700

Note 12 - Fair Value Measurem_4

Note 12 - Fair Value Measurements - Fair Value, Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Total		$ 152,960
Fair Value, Inputs, Level 1 [Member]
Total		152,960
Fair Value, Inputs, Level 2 [Member]
Total		0
Fair Value, Inputs, Level 3 [Member]
Total		0
Money Market Funds [Member]
Money market mutual funds		102,977	$ 27,644
Money market mutual funds		102,977	27,644
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market mutual funds		102,977	27,644
Money market mutual funds		102,977	27,644
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Money market mutual funds		0	0
Money market mutual funds		0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Money market mutual funds		0	0
Money market mutual funds		0	$ 0
US Treasury Securities [Member]
U.S. Treasury bills	[1]	49,983
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
U.S. Treasury bills	[1]	49,983
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
U.S. Treasury bills	[1]	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
U.S. Treasury bills	[1]	$ 0
[1]	The carrying amount of the Company's investments in U.S. Treasury bills approximate 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 at September 30, 2020.

Note 13 - Commitments and Con_2

Note 13 - Commitments and Contingencies (Details Textual) $ in Millions	Sep. 30, 2020USD ($)
Purchase Obligation, Total	$ 15.1