PDF Solutions (PDFS) 10-K 11 Mar 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 03, 2021	Jun. 30, 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	FY
Document Fiscal Year Focus	2020
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 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, Postal Zip Code	95050
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 406,000,000
Entity Common Stock, Shares Outstanding		37,145,127

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 30,315	$ 97,605
Short-term investments	114,981	0
Accounts receivable, net of reserves of $963 in 2020 and $213 in 2019	34,140	40,651
Prepaid expenses and other current assets	13,944	9,320
Total current assets	193,380	147,576
Property and equipment, net	39,242	40,798
Operating lease right-of-use assets, net	6,672	7,609
Goodwill	15,774	2,293
Intangible assets, net	24,573	6,221
Deferred tax assets	249	25,327
Other non-current assets	7,690	9,720
Total assets	287,580	239,544
Current liabilities:
Accounts payable	4,399	7,636
Accrued compensation and related benefits	8,339	5,072
Accrued and other current liabilities	6,309	1,665
Operating lease liabilities – current portion	1,926	1,867
Deferred revenues – current portion	19,895	10,639
Billings in excess of recognized revenues	1,337	1,117
Total current liabilities	42,205	27,996
Long-term income taxes payable	2,956	5,368
Non-current operating lease liabilities	6,516	7,677
Other non-current liabilities	(1,397)	(2,346)
Total liabilities	53,074	43,387
Commitments and contingencies (Note 8)
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 46,400 and 41,797, respectively; shares outstanding 36,850 and 32,503, respectively	6	5
Additional paid-in-capital	407,173	325,197
Treasury stock at cost, 9,550 and 9,294 shares, respectively	(96,215)	(91,695)
Accumulated deficit	(76,233)	(35,870)
Accumulated other comprehensive loss	(225)	(1,480)
Total stockholders’ equity	234,506	196,157
Total liabilities and stockholders’ equity	$ 287,580	$ 239,544

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 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)	46,400	41,797
Common stock, shares outstanding (in shares)	36,850	32,503
Treasury stock, shares (in shares)	9,550	9,294

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 88,046	$ 85,585
Costs and Expenses:
Costs of revenues	36,765	33,474
Research and development	34,654	32,747
Selling, general and administrative	32,677	26,299
Amortization of other acquired intangible assets	741	609
Restructuring charges	0	92
Interest and other expense (income), net	1,269	(276)
Loss before income taxes	(18,060)	(7,360)
Income tax provision (benefit)	22,303	(1,942)
Net loss	(40,363)	(5,418)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	1,253	(204)
Change in unrealized losses related to available-for-sale debt securities, net of tax	2	0
Total other comprehensive income (loss)	1,255	(204)
Comprehensive loss	$ (39,108)	$ (5,622)
Net loss per share:
Basic (in dollars per share)	$ (1.17)	$ (0.17)
Diluted (in dollars per share)	$ (1.17)	$ (0.17)
Weighted average common shares:
Basic (in shares)	34,458	32,411
Diluted (in shares)	34,458	32,411
Analytics [Member]
Revenues:
Revenues	$ 57,232	$ 49,627
Integrated Yield Ramp [Member]
Revenues:
Revenues	$ 30,814	$ 35,958

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - 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)	172		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	1,534	$ 0	0	0	$ 1,534
Issuance of common stock in connection with exercise of options (in shares)	230		0			238
Issuance of common stock in connection with exercise of options	$ 0	1,289	$ 0	0	0	$ 1,289
Vesting of restricted stock units (in shares)	504		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 and exercise of options (in shares)	0		214
Purchases of treasury stock in connection with tax withholdings on restricted stock grants and exercise of options	$ 0	0	$ (2,786)	0	0	(2,786)
Repurchases of common stock (in shares)	(785)		785
Repurchases of common stock	$ 0	0	$ (9,767)	0	0	(9,767)
Stock-based compensation expense	0	11,714	0	0	0	11,714
Comprehensive income (loss)	$ 0	0	$ 0	(5,418)	(204)	(5,622)
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)	183		0
Issuance of common stock in connection with employee stock purchase plan	$ 0	1,670	$ 0	0	0	$ 1,670
Issuance of common stock in connection with exercise of options (in shares)	246		0			246
Issuance of common stock in connection with exercise of options	$ 0	2,570	$ 0	0	0	$ 2,570
Vesting of restricted stock units (in shares)	611		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 and exercise of options (in shares)	0		256
Purchases of treasury stock in connection with tax withholdings on restricted stock grants and exercise of options	$ 0	0	$ (4,520)	0	0	(4,520)
Stock-based compensation expense	0	12,659	0	0	0	12,659
Comprehensive income (loss)	$ 0	0	$ 0	(40,363)	1,255	(39,108)
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	$ 1	65,077	$ 0	0	0	65,078
Balances (in shares) at Dec. 31, 2020	36,850		9,550
Balances at Dec. 31, 2020	$ 6	$ 407,173	$ (96,215)	$ (76,233)	$ (225)	$ 234,506

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Additional Paid-in Capital [Member]
Issuance costs	$ 0.1

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (40,363)	$ (5,418)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	6,725	6,029
Stock-based compensation expense	12,463	11,423
Amortization of acquired intangible assets	(1,446)	(1,183)
Amortization of costs capitalized to obtain revenue contracts	(549)	(448)
Adjustment to contingent consideration related to acquisition	0	36
Loss on disposal and write-down in carrying value of property and equipment	500	130
Accretion of discount on short-term investments	(25)	0
Deferred taxes	(21,007)	4,532
Changes in operating assets and liabilities:
Accounts receivable, net of reserves	8,101	10,919
Prepaid expenses and other current assets	(433)	(810)
Operating lease right-of-use assets	1,193	1,394
Other non-current assets	2,069	758
Accounts payable	(918)	807
Accrued compensation and related benefits	1,926	261
Accrued and other liabilities	928	(597)
Deferred revenues	7,755	3,410
Billings in excess of recognized revenues	220	482
Operating lease liabilities	(1,360)	(1,333)
Net cash provided by operating activities	21,783	24,590
Cash flows from investing activities:
Purchases of short-term investments	(131,454)	0
Proceeds from maturities of short-term investments	16,500	0
Purchases of property and equipment	(6,005)	(10,552)
Prepayment for the purchase of property and equipment	(963)	0
Payment for business acquisition, net of cash acquired	(28,580)	(2,660)
Net cash used in investing activities	(150,502)	(13,212)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs paid	65,078	0
Proceeds from exercise of stock options	2,570	1,161
Proceeds from employee stock purchase plan	1,670	1,534
Payments for taxes related to net share settlement of equity awards	(4,520)	(2,685)
Repurchases of common stock	0	(9,639)
Payment of contingent consideration related to acquisition	0	(206)
Net cash provided by (used in) financing activities	64,798	(9,835)
Effect of exchange rate changes on cash and cash equivalents	131	(27)
Net change in cash, cash equivalents, and restricted cash	(63,790)	1,516
Cash and cash equivalents, beginning of year	97,605	96,089
Cash, cash equivalents, and restricted cash, end of year	33,815	97,605
Reconciliation of cash, cash equivalents and restricted cash, end of year
Reconciliation of cash and cash equivalents	30,315	97,605
Reconciliation of restricted cash included in prepaid expense and other current assets	3,500	0
Cash, cash equivalents, and restricted cash, end of year	33,815	97,605
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes	2,707	2,693
Cash paid for amounts included in the measurement of operating lease liabilities	2,022	1,775
Supplemental disclosure of noncash information:
Stock-based compensation capitalized as software development costs	190	309
Property and equipment received and accrued in accounts payable and accrued and other liabilities	133	1,107
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	286	333
Common shares repurchased from a cashless exercise of stock options	$ 0	$ 128

Note 1 - Description of Busines

Note 1 - Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Description of Business PDF Solutions, Inc. (the “Company” or “PDF”), provides products and services designed to empower engineers and data scientists across the semiconductor ecosystem to connect, collect, manage, and analyze data about design, equipment, manufacturing, and test to improve the yield and quality of their products and operational efficiency. The Company’s products, services, and solutions include proprietary software, physical intellectual property (or IP) for integrated circuit (or IC) designs, electrical measurement hardware tools, proven methodologies, and professional services. Basis of Presentation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions. 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, the estimated useful lives of property and equipment and intangible assets, assumptions made in analysis of allowance for doubtful accounts, fair values of assets acquired and liabilities assumed in business combinations, impairment of goodwill and long-lived assets, valuation for deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income tax uncertainties and contingencies. Actual results could differ from those estimates and may The global COVID- 19 may 2020 may 2020. may 19 may 19 not may may Concentration of Credit Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short -term investments, and accounts receivable. The Company maintains its cash and cash equivalents and short-term investments with what it considers high credit quality financial institutions. The Company primarily sells its products and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2020 two one 2020 December 31, 2019 three one 2019 14 not The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements. Cash and Cash Equivalents, Short-term Investments, and Restricted Cash 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 December 31, 2020, December 31, 2020. December 31, 2020. December 31, 2019, 15 Restricted cash of $3.5 million included in the “Prepaid expenses and other current assets” in the Company’s Consolidated Balance Sheet as of December 31, 2020 2021. 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 12 December 31, 2020 2019 not 12 December 31, 2020 2019 Accounts receivable reserves are summarized below (in thousands): Balance at Beginning of Period Charged to Expense (1) Charged Against Revenue (1) Deductions/ Write-offs of Accounts Balance at End of Period 2020 $ 213 $ — $ 800 $ (50 ) $ 963 2019 $ 332 $ — $ — $ (119 ) $ 213 ________________________ ( 1 Additions to the accounts receivable reserve for doubtful accounts are charged to bad debt expense. Additions to the receivable reserve for billing adjustments are charged against revenue. Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives (in years) of the related asset as follows: Computer equipment 3 Software 3 Furniture, fixtures, and equipment 3 - 10 Laboratory and test equipment 3 - 10 Leasehold improvements Shorter of estimated useful life or term of lease Intangible Assets Intangible assets consist of acquired technology, certain contract rights, customer relationships, trademarks and trade names, and in-process research and development (IP R&D). These intangible assets may one ten may not not Goodwill The Company records goodwill when the purchase consideration of an acquisition exceeds the fair value of the net tangible and identified intangible assets as of the date of acquisition. The Company has one one fourth not not not no Leases The Company has operating leases for administrative and sales offices, research and development laboratory and clean room. The Company recognizes long-term operating lease rights and commitments as operating lease right-of-use assets (ROU), operating lease liabilities and operating lease liabilities, non-current, respectively, in the Consolidated Balance Sheets. The Company also elected the transition package of three not not The Company determines if an arrangement is, or contains, a lease at inception. Operating lease right-of-use assets, and operating lease liabilities are initially recorded based on the present value of lease payments over the lease term. Lease terms include the minimum unconditional term of the lease, and may may may not Software Development Costs Internally developed software is software developed to meet our internal needs to provide certain services to the customers. The Company’s capitalized software development costs consist of internal compensation related costs and external direct costs incurred during the application development stage and are amortized over their useful lives, generally five six not Cost of Revenues Costs of revenues consist primarily of costs incurred to provide and support our services, costs recognized in connection with licensing our software, and amortization of acquired technology. Services costs include material, employee compensation and related benefits, overhead costs, travel, and allocated facilities-related costs. Software license costs consist of costs associated with cloud-delivery related expenses and licensing third Research and Development Expenses Research and development expenses consist primarily of personnel-related costs to support product development activities, including compensation and benefits, outside development services, travel, facilities cost allocations, and stock-based compensation charges. Research and development expenses are charged to operations as incurred. Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of compensation and benefits for sales, marketing and general and administrative personnel, legal and accounting services, marketing communications, travel and facilities cost allocations, and stock-based compensation charges. Stock-Based Compensation The Company accounts for stock-based compensation using the fair value method, which requires the Company to measure stock-based compensation based on the grant-date fair value of the awards and recognize the compensation expense over the requisite service period. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The fair value of the Company’s restricted stock units (“RSUs”) is equal to the market value of the Company’s common stock on the date of the grant. These awards are subject to time-based vesting which generally occurs over a period of four The fair value of the Company’s stock options is estimated using the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life is based on historical experience and on the terms and conditions of the stock options granted. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options. Income Taxes The Company’s provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not not No estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than- not not 50% Net Income (Loss) Per Share Basic net income (loss) per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of RSUs, contingently issuable shares for all periods and assumed issuance of shares under the Company’s employee stock purchase plan. No Foreign Currency Translation The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of comprehensive loss are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive loss. Gains and losses resulting from foreign currency transactions are included in the Consolidated Statements of Comprehensive Loss. Derivative Financial Instruments The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. 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. The Company does not not not three Business Combinations The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values at the date of the business combination. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not may not not one Litigation From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with Financial Accounting Standards Board (FASB) requirements. See Note 8, 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. December 31, 2020, December 31, 2020. December 31, 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

Note 2 - Revenue	12 Months Ended
	Dec. 31, 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 FASB 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 for software, SaaS, Data Connectivity and Equipment Control Software, DFI™ and CV® systems that do not Revenue from standalone 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 the customer having to take possession of software, is accounted for as a subscription and is recognized as revenue ratably, on a straight-line basis, over the subscription period beginning on the date the service is first Revenue from DFI™ and CV® systems that do not not Integrated Yield Ramp Revenue Integrated Yield Ramp revenue is derived from the Company’s fixed-fee engagements that include performance incentives based on customers’ yield achievement and Gainshare royalties, typically based on customer’s wafer shipments, pertaining to these fixed-price contracts, which royalties are variable. Revenue under these project–based contracts, which are delivered over a specific period of time, typically for a fixed fee component paid on a set schedule, is recognized as services are performed using a percentage of completion method based on costs or labor-inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Where there are distinct performance obligations, the Company allocates revenue to all deliverables based on their SSPs and allocates the transaction price of the contract to each performance obligation on a relative basis using SSP. Similar to the services provided in connection with DFI™ 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 a customer’s yield achievement. Revenue derived from Gainshare is contingent upon the Company’s customers reaching certain defined production yield levels. Gainshare royalty periods are generally subsequent to the delivery of all contractual services and performance obligations. The Company records Gainshare as a usage-based royalty derived from customers’ usage of intellectual property and records it in the same period in which the usage occurs. Disaggregation of Revenue The Company disaggregates revenue from contracts with customers into the timing of the transfer of goods and services and the geographical regions. The Company determined that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The Company’s performance obligations are satisfied either over time or at a point-in-time. The following table represents a disaggregation of revenue by timing of revenue: Year Ended December 31, 2020 2019 Over time 63 % 66 % Point-in-time 37 % 34 % Total 100 % 100 % International revenues accounted for approximately 58% of total revenues for the year ended December 31, 2020 2019 14, 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 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. See Note 1 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 December 31, 2020 2019 not 2020 2019. 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 December 31, 2020 2019 December 31, 2020 2019, At December 31, 2020, two three not not The adjustment to revenue recognized in the years ended December 31, 2020 2019 of $0.1 million an 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 Consolidated Balance Sheets as of December 31, 2020 2019 December 31, 2020 2019 December 31, 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 cost of revenues, the timing of which is dependent upon identification of a contract arrangement. At the end of the reporting period, the Company evaluates its deferred costs for their probable recoverability. Deferred costs balance included in prepaid expenses and other current assets in the accompanying Consolidated Balance Sheets was immaterial as of December 31, 2020 December 31, 2019. December 31, 2020 December 31, 2019. no no no Practical Expedients The Company does not one not December 31, 2020 2019.

Note 3 - Strategic Partnership

Note 3 - Strategic Partnership Agreement With Advantest and Related Party Transactions	12 Months Ended
	Dec. 31, 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 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 software analytics platform for both Advantest’s internal use as well as use by Advantest’s customers. Except as may may thirty 30 iv. Commercial Agreement Costs and expenses incurred related to the Development Agreement have not December 31, 2020. 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 Costs and expenses incurred related to the Commercial Agreement with Advantest have not December 31, 2020. Analytics revenue recognized from Advantest during the year ended December 31, 2020 December 31, 2020. The Company carries out transactions with Advantest on arm’s length commercial customary terms.

Note 4 - Business Combination

Note 4 - Business Combination	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Business Combination Disclosure [Text Block]	4. On December 1, 2020 ( 4.0 150 not The Company accounted for this acquisition as a business combination in accordance with FASB ASC Topic 805, not December 31, 2020, twelve 2020 The allocation of the purchase price for this acquisition, as of the date of the acquisition, is as follows (in thousands, except amortization period): Amount Amortization Period (Years) Allocation of Purchase Price: Assets Fair value of tangible assets (including cash of $ 5,900 $ 8,403 Fair value of intangible assets: Developed technology 12,541 8 In-process R&D 3,635 N/A Customer relationships 1,967 10 Noncompetition agreements 848 3 Tradenames and trademarks 808 10 Goodwill 13,481 N/A Total assets acquired $ 41,683 Liabilities Accounts payable and accrued expenses $ 1,437 Deferred revenue 391 Operating lease liabilities 132 Deferred tax liabilities 1,743 Total liabilities assumed $ 3,703 Total consideration, net $ 37,980 The estimated fair value of accounts receivable acquired approximates the contractual value of $1.6 million. Pursuant to the merger agreement, the Company will also make payments to certain employees, subject to their continued employment with Cimetrix, through the second 2024. December 31, 2020, Acquisition-Related Transaction Costs - December 31, 2020. The amount of revenues related to Cimetrix that was included in the Company’s consolidated statement of comprehensive loss for the year ended December 31, 2020 not not not

Note 5 - Property and Equipment

Note 5 - Property and Equipment	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	5. Property and equipment consist of (in thousands): December 31, 2020 2019 Computer equipment $ 11,585 $ 10,880 Software 5,451 4,690 Furniture, fixtures, and equipment 2,507 2,395 Leasehold improvements 6,255 6,095 Laboratory and other equipment 3,451 4,933 Test equipment 26,010 22,980 Construction-in-progress 20,278 18,245 75,537 70,218 Less: accumulated depreciation and amortization (36,295 ) (29,420 ) Total $ 39,242 $ 40,798 Test equipment includes DFI™ assets at customer sites that are contributing to Analytics revenue from DFI systems. The construction-in-progress balance related to construction of DFI™ assets totaled $18.9 million and $16.6 million as of December 31, 2020 2019 December 31, 2020 2019

Note 6 - Goodwill and Intangibl

Note 6 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	6 . GOODWILL AND INTANGIBLE ASSETS The Company completed the acquisition of Cimetrix in the year ended December 31, 2020. 4 As of December 31, 2020 2019 December 31, 2020 2019: December 31, (Dollars in thousands) 2020 2019 Balance at beginning of year $ 2,293 $ 2,293 Addition 13,481 — Balance at end of year $ 15,774 $ 2,293 Intangible assets balance was $24.6 million and $6.2 million as of December 31, 2020 2019 December 31, 2020 2019 December 31, 2020 December 31, 2019 Amortization Gross Net Gross Net Period Carrying Accumulated Carrying Carrying Accumulated Carrying (Dollars in thousands) (Years) Amount Amortization Amount Amount Amortization Amount Customer relationships 1 - 10 $ 9,407 $ (5,398 ) $ 4,009 $ 7,440 $ (4,935 ) $ 2,505 Developed technology 4 - 9 30,000 (14,987 ) 15,013 17,460 (14,101 ) 3,359 Tradenames and trademarks 2 - 10 1,598 (706 ) 892 790 (673 ) 117 Patent 7 - 10 1,800 (1,600 ) 200 1,800 (1,560 ) 240 Noncompetition agreements 3 848 (24 ) 824 — — — In-process R&D * 3,635 — 3,635 — — — Total $ 47,288 $ (22,715 ) $ 24,573 $ 27,490 $ (21,269 ) $ 6,221 _________________________________ * Non-amortizing intangible asset The weighted average amortization period for acquired identifiable intangible assets was 7.4 years as of December 31, 2020 December 31, 2020 2019 Year Ending December 31, 2021 $ 3,221 2022 3,013 2023 2,990 2024 2,592 2025 2,427 2026 and thereafter 6,695 Total future amortization expense $ 20,938 There were no impairment charges for goodwill and intangible assets for the year ended December 31, 2020 2019.

Note 7 - Leases

Note 7 - Leases	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	7 . LEASES Lease expense was comprised of the following (in thousands): Year Ended December 31, 2020 2019 Operating lease expense $ 1,828 $ 1,840 Short-term lease and variable lease expense 545 492 Total lease expense $ 2,373 $ 2,332 Supplemental balance sheets information related to leases was as follows: December 31, 2020 2019 Weighted average remaining lease term under operating ROU leases (in years) 6.4 7.2 Weighted average discount rate for operating lease liabilities 5.24 % 5.25 % Operating lease ROU assets obtained (in thousands) $ 286 $ 333 Maturity of operating lease liabilities as of December 31, 2020 Year ending December 31, Amount(1) 2021 $ 1,967 2022 1,704 2023 1,387 2024 1,074 2025 1,091 2026 and thereafter 2,703 Total future minimum lease payments $ 9,926 Less: Interest(2) (1,484 ) Present value of operating lease liabilities(3) $ 8,442 ( 1 As of December 31, 2020 ( 2 Calculated using incremental borrowing interest rate for each lease. ( 3 Includes the current portion of operating lease liabilities of $1.9 million as of December 31, 2020

Note 8 - Commitments and Contin

Note 8 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	8. Strategic Partnership with Advantest See Note 3 Operating Leases Refer to Note 7, Indemnifications The Company generally provides a warranty to its customers that its software will perform substantially in accordance with documented specifications typically for a period of 90 third not Purchase obligations The Company has purchase obligations with certain suppliers for the purchase of goods and services entered in the ordinary course of business. As of December 31, 2020 12 Indemnification of Officers and Directors As permitted by the Delaware general corporation law, the Company has included a provision in its certificate of incorporation to eliminate the personal liability of its officers and directors for monetary damages for breach or alleged breach of their fiduciary duties as officers or directors, other than in cases of fraud or other willful misconduct. In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may may not Litigation From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable, and the loss can be reasonably estimated in accordance with FASB requirements. As of December 31, 2020 not no no On May 6, 2020 ,

Note 9 - Stockholders' Equity

Note 9 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	9 . STOCKHOLDERS’ EQUITY Issuance of Common Stock 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 December 31, 2020, 2020 2018 December 31, 2019, 2018 May 28, 2020, 2018

Note 10 - Employee Benefit Plan

Note 10 - Employee Benefit Plans	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	10 . EMPLOYEE BENEFIT PLANS On December 31, 2020, Employee Stock Purchase Plan In July 2001, ten “2001 twenty-four four six January 1 2002, 1 2 3 May 18, 2010, May 17, 2020 ( “2010 2020 2010 June 22, 2030 not 2010 May 17, 2020. 2010 no 2010 January 31, 2022. The Company estimated the fair value of purchase rights granted under the 2010 2010 Purchase Plan 2020 2019 Expected life (in years) 1.25 1.25 Volatility 34.25 % 44.85 % Risk-free interest rate 1.43 % 2.49 % Expected dividend — — Weighted average fair value of purchase rights granted during the period $ 4.83 $ 4.08 During the year ended December 31, 2020 2019, December 31, 2020, December 31, 2020, Stock Incentive Plans On November 16, 2011, 2011 “2011 2011 may 2001 adopted by the Company in 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 December 31, 2020, 2011 2011 2001 2011 December 31, 2020. December 31, 2020, no 2011 2001 The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life, interest rate and expected dividend. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options. Stock Plans 2020 2019 Expected life (in years) 4.45 4.46 Volatility 40.90 % 41.56 % Risk-free interest rate 0.60 % 1.86 % Expected dividend — — Weighted average fair value of options granted during the period $ 5.75 $ 5.00 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 Stock-based compensation expenses related to the Company’s stock plans and employee stock purchase plan were allocated as follows (in thousands): Year Ended December 31, 2020 2019 Costs of revenues $ 3,454 $ 3,185 Research and development 4,800 4,764 Selling, general and administrative 4,209 3,474 Stock-based compensation expenses $ 12,463 $ 11,423 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 in the third 2020. December 31, 2020 2019, Additional information with respect to options under the Plans is as follows: Outstanding Options Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2019 1,027 $ 9.75 Granted (weighted average fair value of $ 5.00 102 $ 13.79 Exercised (238 ) $ 5.41 Canceled (87 ) $ 14.57 Expired (59 ) $ 15.83 Outstanding, December 31, 2019 745 $ 10.64 Granted (weighted average fair value of $ 5.75 24 $ 16.72 Exercised (246 ) $ 10.46 Canceled (57 ) $ 11.65 Expired (10 ) $ 10.06 Outstanding, December 31, 2020 456 $ 10.95 3.17 $ 4,864 Vested and expected to vest, December 31, 2020 449 $ 10.88 3.08 $ 4,818 Exercisable, December 31, 2020 379 $ 10.15 2.05 $ 4,342 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $21.60 as of December 31, 2020 December 31, 2020 2019 As of December 31, 2020 December 31, 2020 Nonvested shares (restricted stock units) were as follows: Shares (in thousands) Fair Value Nonvested, January 1, 2019 1,835 $ 11.93 Granted 952 $ 13.52 Vested (710 ) $ 13.05 Forfeited (190 ) $ 12.18 Nonvested, December 31, 2019 1,887 $ 12.30 Granted 890 $ 21.31 Vested (867 ) $ 13.25 Forfeited (163 ) $ 13.23 Nonvested, December 31, 2020 1,747 $ 16.33 As of December 31, 2020 not 401 In 1999, 401 may not 401 401 50 100% not 401

Note 11 - Restructuring Charges

Note 11 - Restructuring Charges	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	11 . RESTRUCTURING CHARGES On September 27, 2018, October 24, 2018. From inception of the restructuring plan to December 31, 2020 December 31, 2020, not The following table summarizes the activities of restructuring liabilities under this plan (in thousands): Year Ended December 31, 2020 2019 Beginning balance $ — $ 244 Restructuring charges — 92 Cash payments — (336 ) Ending balance $ — $ —

Note 12 - Income Taxes

Note 12 - Income Taxes	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12 . INCOME TAXES During the years ended December 31, 2020 2019 Year Ended December 31, 2020 2019 (In thousands) U.S. Current $ (1,325 ) $ (107 ) Deferred 21,056 (4,534 ) Foreign Current 238 312 Withholding 2,392 2,385 Deferred (58 ) 2 Total income tax provision (benefit) $ 22,303 $ (1,942 ) The income tax benefit differs from the amount estimated by applying the statutory federal income tax rate (21% for 2020 2019 Year Ended December 31, 2020 2019 Federal statutory tax provision $ (3,793 ) $ (1,546 ) State tax provision 703 (85 ) Stock compensation expense (602 ) 234 Tax credits (3,488 ) (2,974 ) Foreign tax, net 2,443 2,430 Tax law changes (2,237 ) — Business combination costs 356 — Change in valuation allowance 29,034 — Other (113 ) (1 ) Total income tax provision (benefit) $ 22,303 $ (1,942 ) As of December 31, 2020 2021 2028 As of December 31, 2020 2022, no may three 1986 1987. The Company assesses its deferred tax assets for recoverability on a regular basis, and where applicable, a valuation allowance is recorded to reduce the total deferred tax asset to an amount that will, more likely than not, fourth 2020, 12 December 31, 2020 not 2022. December 31, 2020 2019 December 31, 2019, not not” may 12 not December 31, 2020 2019 The components of the net deferred tax assets are comprised of (in thousands): December 31, 2020 2019 Deferred tax assets Net operating loss carry forward $ 8,085 $ 4,596 Research and development and other credit carry forward 24,723 18,944 Foreign tax credit carry forward 9,435 6,443 Accruals deductible in different periods 3,471 1,968 Leases 1,669 1,850 Intangible assets — 741 Stock-based compensation 1,220 1,271 Total deferred tax assets 48,603 35,813 Less: valuation allowance (41,859 ) (10,486 ) Deferred tax assets, net of valuation allowance $ 6,744 $ 25,327 Deferred tax liabilities Property and equipment, net (629 ) (611 ) Operating lease right-of-use assets (1,669 ) (1,850 ) Intangible assets (4,218 ) — Deferred tax liabilities $ (6,516 ) $ (2,461 ) Net deferred tax assets $ 228 $ 22,866 In accordance with the accounting standard relating to accounting for uncertain tax positions, the Company classifies its liabilities for income tax exposures as long-term. The Company includes interest and penalties related to unrecognized tax benefits within the Company’s income tax provision. As of December 31, 2020 2019 December 31, 2020 2019 The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2020 December 31, 2020 not twelve A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): Amount Gross unrecognized tax benefits, January 1, 2018 $ 12,889 Increases in tax positions for current year 664 Increases in tax positions for prior years — Lapse in statute of limitations (261 ) Gross unrecognized tax benefits, December 31, 2018 13,292 Increases in tax positions for current year 667 Increases in tax positions for prior years 1 Lapse in statute of limitations (345 ) Gross unrecognized tax benefits, December 31, 2019 13,615 Increases in tax positions for current year 1,024 Increases in tax positions for prior years 71 Lapse in statute of limitations (410 ) Gross unrecognized tax benefits, December 31, 2020 $ 14,300 The Company does 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. For U.S. federal and California income tax purposes, the statute of limitations currently remains open for the years ending 2017 2016 2013 2015 may may may not Valuation allowance for deferred tax assets is summarized (in thousands): Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 2020 $ 10,486 $ 31,373 $ — $ 41,859 2019 $ 9,808 $ 678 $ — $ 10,486

Note 13 - Net Loss Per Share

Note 13 - Net Loss Per Share	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Earnings Per Share [Text Block]	13 . 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): Year Ended December 31, 2020 2019 Numerator: Net loss $ (40,363 ) $ (5,418 ) Denominator: Basic weighted-average shares outstanding 34,458 32,411 Effect of dilutive options and restricted stock units — — Diluted weighted-average shares outstanding 34,458 32,411 Net loss per share – Basic $ (1.17 ) $ (0.17 ) Net loss per share – Diluted $ (1.17 ) $ (0.17 ) For the years ended December 31, 2020 2019 The following table sets forth potential shares of common stock that are not Year Ended December 31, 2020 2019 Outstanding options 332 538 Nonvested shares of restricted stock units 921 915 Employee Stock Purchase Plan 160 141 Total 1,413 1,594

Note 14 - Customer and Geograph

Note 14 - Customer and Geographic Information	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	14 . 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% Year Ended December 31, Customer 2020 2019 A 23 % 31 % The Company had gross accounts receivable balances (including amounts that are unbilled) from individual customers in excess of 10% December 31, Customer 2020 2019 A 16 % 27 % B * % 14 % C 11 % 12 % __________________________ * represents less than 10% Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands): Year Ended December 31, 2020 2019 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 36,723 42 % $ 36,169 42 % China 13,776 16 13,960 16 Taiwan 8,038 9 8,574 10 Rest of the world 29,509 33 26,882 32 Total revenue $ 88,046 100 % $ 85,585 100 % Long-lived assets, net by geographic area is as follows (in thousands): December 31, 2020 2019 United States $ 43,663 $ 46,000 Rest of the world 2,251 2,407 Total long-lived assets, net $ 45,914 $ 48,407

Note 15 - Financial Instruments

Note 15 - Financial Instruments	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	1 5 . FINANCIAL INSTRUMENTS 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 December 31, 2020 Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash equivalents Money market mutual funds $ 18,012 $ 18,012 $ — $ — Short-term investments (available-for-sale debt securities) U.S. Treasury bills (1) 114,981 114,981 — — Total $ 132,993 $ 132,993 $ — $ — __________________________ ( 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 December 31, 2020. The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2019 Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (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 December 31, 2020 2019, The Company’s foreign currency forward contracts were classified as Level 2 not December 31, 2020 2019, no

Note 16 - Selected Quarterly Fi

Note 16 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2020
Notes to Financial Statements
Quarterly Financial Information [Text Block]	16 . SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) The following is a summary of the Company’s quarterly consolidated results of operations (unaudited) for the fiscal years ended December 31, 2020 2019 Year Ended December 31, 2020 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 21,158 $ 21,409 $ 23,112 $ 22,367 Costs of revenues $ 8,487 $ 8,946 $ 9,493 $ 9,839 Net loss $ (528 ) $ (3,652 ) $ (2,734 ) $ (33,449 ) Net loss per share: Basic $ (0.02 ) $ (0.11 ) $ (0.08 ) $ (0.91 ) Diluted $ (0.02 ) $ (0.11 ) $ (0.08 ) $ (0.91 ) Year Ended December 31, 2019 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 20,541 $ 20,568 $ 21,914 $ 22,562 Costs of revenues $ 7,867 $ 7,832 $ 8,715 $ 9,059 Net loss $ (2,691 ) $ (710 ) $ (687 ) $ (1,330 ) Net loss per share: Basic $ (0.08 ) $ (0.02 ) $ (0.02 ) $ (0.04 ) Diluted $ (0.08 ) $ (0.02 ) $ (0.02 ) $ (0.04 )

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
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, the estimated useful lives of property and equipment and intangible assets, assumptions made in analysis of allowance for doubtful accounts, fair values of assets acquired and liabilities assumed in business combinations, impairment of goodwill and long-lived assets, valuation for deferred tax assets, and accounting for lease obligations, stock-based compensation expense, and income tax uncertainties and contingencies. Actual results could differ from those estimates and may The global COVID- 19 may 2020 may 2020. may 19 may 19 not may may
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents, short -term investments, and accounts receivable. The Company maintains its cash and cash equivalents and short-term investments with what it considers high credit quality financial institutions. The Company primarily sells its products and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2020 two one 2020 December 31, 2019 three one 2019 14 not The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements.
Cash, Cash Equivalents, and Short-term Investments, Policy [Policy Text Block]	Cash and Cash Equivalents, Short-term Investments, and Restricted Cash 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 December 31, 2020, December 31, 2020. December 31, 2020. December 31, 2019, 15 Restricted cash of $3.5 million included in the “Prepaid expenses and other current assets” in the Company’s Consolidated Balance Sheet as of December 31, 2020 2021. 4,
Accounts Receivable [Policy Text Block]	Accounts Receivable Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within 12 December 31, 2020 2019 not 12 December 31, 2020 2019 Accounts receivable reserves are summarized below (in thousands): Balance at Beginning of Period Charged to Expense (1) Charged Against Revenue (1) Deductions/ Write-offs of Accounts Balance at End of Period 2020 $ 213 $ — $ 800 $ (50 ) $ 963 2019 $ 332 $ — $ — $ (119 ) $ 213 ________________________ ( 1 Additions to the accounts receivable reserve for doubtful accounts are charged to bad debt expense. Additions to the receivable reserve for billing adjustments are charged against revenue.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives (in years) of the related asset as follows: Computer equipment 3 Software 3 Furniture, fixtures, and equipment 3 - 10 Laboratory and test equipment 3 - 10 Leasehold improvements Shorter of estimated useful life or term of lease
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Intangible Assets Intangible assets consist of acquired technology, certain contract rights, customer relationships, trademarks and trade names, and in-process research and development (IP R&D). These intangible assets may one ten may not not
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill The Company records goodwill when the purchase consideration of an acquisition exceeds the fair value of the net tangible and identified intangible assets as of the date of acquisition. The Company has one one fourth not not not no
Lessee, Leases [Policy Text Block]	Leases The Company has operating leases for administrative and sales offices, research and development laboratory and clean room. The Company recognizes long-term operating lease rights and commitments as operating lease right-of-use assets (ROU), operating lease liabilities and operating lease liabilities, non-current, respectively, in the Consolidated Balance Sheets. The Company also elected the transition package of three not not The Company determines if an arrangement is, or contains, a lease at inception. Operating lease right-of-use assets, and operating lease liabilities are initially recorded based on the present value of lease payments over the lease term. Lease terms include the minimum unconditional term of the lease, and may may may not
Research, Development, and Computer Software, Policy [Policy Text Block]	Software Development Costs Internally developed software is software developed to meet our internal needs to provide certain services to the customers. The Company’s capitalized software development costs consist of internal compensation related costs and external direct costs incurred during the application development stage and are amortized over their useful lives, generally five six not
Cost of Goods and Service [Policy Text Block]	Cost of Revenues Costs of revenues consist primarily of costs incurred to provide and support our services, costs recognized in connection with licensing our software, and amortization of acquired technology. Services costs include material, employee compensation and related benefits, overhead costs, travel, and allocated facilities-related costs. Software license costs consist of costs associated with cloud-delivery related expenses and licensing third
Research and Development Expense, Policy [Policy Text Block]	Research and Development Expenses Research and development expenses consist primarily of personnel-related costs to support product development activities, including compensation and benefits, outside development services, travel, facilities cost allocations, and stock-based compensation charges. Research and development expenses are charged to operations as incurred.
Selling, General and Administrative Expenses, Policy [Policy Text Block]	Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of compensation and benefits for sales, marketing and general and administrative personnel, legal and accounting services, marketing communications, travel and facilities cost allocations, and stock-based compensation charges.
Share-based Payment Arrangement [Policy Text Block]	Stock-Based Compensation The Company accounts for stock-based compensation using the fair value method, which requires the Company to measure stock-based compensation based on the grant-date fair value of the awards and recognize the compensation expense over the requisite service period. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The fair value of the Company’s restricted stock units (“RSUs”) is equal to the market value of the Company’s common stock on the date of the grant. These awards are subject to time-based vesting which generally occurs over a period of four The fair value of the Company’s stock options is estimated using the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life is based on historical experience and on the terms and conditions of the stock options granted. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
Income Tax, Policy [Policy Text Block]	Income Taxes The Company’s provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not not No estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than- not not 50%
Earnings Per Share, Policy [Policy Text Block]	Net Income (Loss) Per Share Basic net income (loss) per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of RSUs, contingently issuable shares for all periods and assumed issuance of shares under the Company’s employee stock purchase plan. No
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of comprehensive loss are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive loss. Gains and losses resulting from foreign currency transactions are included in the Consolidated Statements of Comprehensive Loss.
Derivatives, Policy [Policy Text Block]	Derivative Financial Instruments The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. 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. The Company does not not not three
Business Combinations Policy [Policy Text Block]	Business Combinations The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values at the date of the business combination. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Significant estimates in valuing certain intangible assets include, but are not may not not one
Legal Costs, Policy [Policy Text Block]	Litigation From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with Financial Accounting Standards Board (FASB) requirements. See Note 8,
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. December 31, 2020, December 31, 2020. December 31, 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 - Description of Busin_2

Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Allowance for Doubtful Accounts [Table Text Block]	Balance at Beginning of Period Charged to Expense (1) Charged Against Revenue (1) Deductions/ Write-offs of Accounts Balance at End of Period 2020 $ 213 $ — $ 800 $ (50 ) $ 963 2019 $ 332 $ — $ — $ (119 ) $ 213
Property Plant and Equipment Estimated Useful Lives [Table Text Block]	Computer equipment 3 Software 3 Furniture, fixtures, and equipment 3 - 10 Laboratory and test equipment 3 - 10 Leasehold improvements Shorter of estimated useful life or term of lease

Note 2 - Revenue (Tables)

Note 2 - Revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2020 2019 Over time 63 % 66 % Point-in-time 37 % 34 % Total 100 % 100 %

Note 4 - Business Combination (

Note 4 - Business Combination (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	Amount Amortization Period (Years) Allocation of Purchase Price: Assets Fair value of tangible assets (including cash of $ 5,900 $ 8,403 Fair value of intangible assets: Developed technology 12,541 8 In-process R&D 3,635 N/A Customer relationships 1,967 10 Noncompetition agreements 848 3 Tradenames and trademarks 808 10 Goodwill 13,481 N/A Total assets acquired $ 41,683 Liabilities Accounts payable and accrued expenses $ 1,437 Deferred revenue 391 Operating lease liabilities 132 Deferred tax liabilities 1,743 Total liabilities assumed $ 3,703 Total consideration, net $ 37,980

Note 5 - Property and Equipme_2

Note 5 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 2020 2019 Computer equipment $ 11,585 $ 10,880 Software 5,451 4,690 Furniture, fixtures, and equipment 2,507 2,395 Leasehold improvements 6,255 6,095 Laboratory and other equipment 3,451 4,933 Test equipment 26,010 22,980 Construction-in-progress 20,278 18,245 75,537 70,218 Less: accumulated depreciation and amortization (36,295 ) (29,420 ) Total $ 39,242 $ 40,798

Note 6 - Goodwill and Intangi_2

Note 6 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Goodwill [Table Text Block]	December 31, (Dollars in thousands) 2020 2019 Balance at beginning of year $ 2,293 $ 2,293 Addition 13,481 — Balance at end of year $ 15,774 $ 2,293
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2020 December 31, 2019 Amortization Gross Net Gross Net Period Carrying Accumulated Carrying Carrying Accumulated Carrying (Dollars in thousands) (Years) Amount Amortization Amount Amount Amortization Amount Customer relationships 1 - 10 $ 9,407 $ (5,398 ) $ 4,009 $ 7,440 $ (4,935 ) $ 2,505 Developed technology 4 - 9 30,000 (14,987 ) 15,013 17,460 (14,101 ) 3,359 Tradenames and trademarks 2 - 10 1,598 (706 ) 892 790 (673 ) 117 Patent 7 - 10 1,800 (1,600 ) 200 1,800 (1,560 ) 240 Noncompetition agreements 3 848 (24 ) 824 — — — In-process R&D * 3,635 — 3,635 — — — Total $ 47,288 $ (22,715 ) $ 24,573 $ 27,490 $ (21,269 ) $ 6,221
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year Ending December 31, 2021 $ 3,221 2022 3,013 2023 2,990 2024 2,592 2025 2,427 2026 and thereafter 6,695 Total future amortization expense $ 20,938

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Lease, Cost [Table Text Block]	Year Ended December 31, 2020 2019 Operating lease expense $ 1,828 $ 1,840 Short-term lease and variable lease expense 545 492 Total lease expense $ 2,373 $ 2,332 December 31, 2020 2019 Weighted average remaining lease term under operating ROU leases (in years) 6.4 7.2 Weighted average discount rate for operating lease liabilities 5.24 % 5.25 % Operating lease ROU assets obtained (in thousands) $ 286 $ 333
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year ending December 31, Amount(1) 2021 $ 1,967 2022 1,704 2023 1,387 2024 1,074 2025 1,091 2026 and thereafter 2,703 Total future minimum lease payments $ 9,926 Less: Interest(2) (1,484 ) Present value of operating lease liabilities(3) $ 8,442

Note 10 - Employee Benefit Pl_2

Note 10 - Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	2010 Purchase Plan 2020 2019 Expected life (in years) 1.25 1.25 Volatility 34.25 % 44.85 % Risk-free interest rate 1.43 % 2.49 % Expected dividend — — Weighted average fair value of purchase rights granted during the period $ 4.83 $ 4.08 Stock Plans 2020 2019 Expected life (in years) 4.45 4.46 Volatility 40.90 % 41.56 % Risk-free interest rate 0.60 % 1.86 % Expected dividend — — Weighted average fair value of options granted during the period $ 5.75 $ 5.00
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Year Ended December 31, 2020 2019 Costs of revenues $ 3,454 $ 3,185 Research and development 4,800 4,764 Selling, general and administrative 4,209 3,474 Stock-based compensation expenses $ 12,463 $ 11,423
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Outstanding Options Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2019 1,027 $ 9.75 Granted (weighted average fair value of $ 5.00 102 $ 13.79 Exercised (238 ) $ 5.41 Canceled (87 ) $ 14.57 Expired (59 ) $ 15.83 Outstanding, December 31, 2019 745 $ 10.64 Granted (weighted average fair value of $ 5.75 24 $ 16.72 Exercised (246 ) $ 10.46 Canceled (57 ) $ 11.65 Expired (10 ) $ 10.06 Outstanding, December 31, 2020 456 $ 10.95 3.17 $ 4,864 Vested and expected to vest, December 31, 2020 449 $ 10.88 3.08 $ 4,818 Exercisable, December 31, 2020 379 $ 10.15 2.05 $ 4,342
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Shares (in thousands) Fair Value Nonvested, January 1, 2019 1,835 $ 11.93 Granted 952 $ 13.52 Vested (710 ) $ 13.05 Forfeited (190 ) $ 12.18 Nonvested, December 31, 2019 1,887 $ 12.30 Granted 890 $ 21.31 Vested (867 ) $ 13.25 Forfeited (163 ) $ 13.23 Nonvested, December 31, 2020 1,747 $ 16.33

Note 11 - Restructuring Charg_2

Note 11 - Restructuring Charges (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Restructuring and Related Costs [Table Text Block]	Year Ended December 31, 2020 2019 Beginning balance $ — $ 244 Restructuring charges — 92 Cash payments — (336 ) Ending balance $ — $ —

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 2020 2019 (In thousands) U.S. Current $ (1,325 ) $ (107 ) Deferred 21,056 (4,534 ) Foreign Current 238 312 Withholding 2,392 2,385 Deferred (58 ) 2 Total income tax provision (benefit) $ 22,303 $ (1,942 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2020 2019 Federal statutory tax provision $ (3,793 ) $ (1,546 ) State tax provision 703 (85 ) Stock compensation expense (602 ) 234 Tax credits (3,488 ) (2,974 ) Foreign tax, net 2,443 2,430 Tax law changes (2,237 ) — Business combination costs 356 — Change in valuation allowance 29,034 — Other (113 ) (1 ) Total income tax provision (benefit) $ 22,303 $ (1,942 )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2020 2019 Deferred tax assets Net operating loss carry forward $ 8,085 $ 4,596 Research and development and other credit carry forward 24,723 18,944 Foreign tax credit carry forward 9,435 6,443 Accruals deductible in different periods 3,471 1,968 Leases 1,669 1,850 Intangible assets — 741 Stock-based compensation 1,220 1,271 Total deferred tax assets 48,603 35,813 Less: valuation allowance (41,859 ) (10,486 ) Deferred tax assets, net of valuation allowance $ 6,744 $ 25,327 Deferred tax liabilities Property and equipment, net (629 ) (611 ) Operating lease right-of-use assets (1,669 ) (1,850 ) Intangible assets (4,218 ) — Deferred tax liabilities $ (6,516 ) $ (2,461 ) Net deferred tax assets $ 228 $ 22,866
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Amount Gross unrecognized tax benefits, January 1, 2018 $ 12,889 Increases in tax positions for current year 664 Increases in tax positions for prior years — Lapse in statute of limitations (261 ) Gross unrecognized tax benefits, December 31, 2018 13,292 Increases in tax positions for current year 667 Increases in tax positions for prior years 1 Lapse in statute of limitations (345 ) Gross unrecognized tax benefits, December 31, 2019 13,615 Increases in tax positions for current year 1,024 Increases in tax positions for prior years 71 Lapse in statute of limitations (410 ) Gross unrecognized tax benefits, December 31, 2020 $ 14,300
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Notes Tables
Summary of Valuation Allowance [Table Text Block]	Balance at Beginning of Period Charged to Costs and Expenses Deductions/ Write-offs of Accounts Balance at End of Period Valuation allowance for deferred tax assets 2020 $ 10,486 $ 31,373 $ — $ 41,859 2019 $ 9,808 $ 678 $ — $ 10,486

Note 13 - Net Loss Per Share (T

Note 13 - Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, 2020 2019 Numerator: Net loss $ (40,363 ) $ (5,418 ) Denominator: Basic weighted-average shares outstanding 34,458 32,411 Effect of dilutive options and restricted stock units — — Diluted weighted-average shares outstanding 34,458 32,411 Net loss per share – Basic $ (1.17 ) $ (0.17 ) Net loss per share – Diluted $ (1.17 ) $ (0.17 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Year Ended December 31, 2020 2019 Outstanding options 332 538 Nonvested shares of restricted stock units 921 915 Employee Stock Purchase Plan 160 141 Total 1,413 1,594

Note 14 - Customer and Geogra_2

Note 14 - Customer and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Year Ended December 31, Customer 2020 2019 A 23 % 31 % December 31, Customer 2020 2019 A 16 % 27 % B * % 14 % C 11 % 12 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Year Ended December 31, 2020 2019 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 36,723 42 % $ 36,169 42 % China 13,776 16 13,960 16 Taiwan 8,038 9 8,574 10 Rest of the world 29,509 33 26,882 32 Total revenue $ 88,046 100 % $ 85,585 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	December 31, 2020 2019 United States $ 43,663 $ 46,000 Rest of the world 2,251 2,407 Total long-lived assets, net $ 45,914 $ 48,407

Note 15 - Financial Instrumen_2

Note 15 - Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash equivalents Money market mutual funds $ 18,012 $ 18,012 $ — $ — Short-term investments (available-for-sale debt securities) U.S. Treasury bills (1) 114,981 114,981 — — Total $ 132,993 $ 132,993 $ — $ — Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash equivalents Money market mutual funds $ 27,644 $ 27,644 $ — $ —

Note 16 - Selected Quarterly _2

Note 16 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Notes Tables
Quarterly Financial Information [Table Text Block]	Year Ended December 31, 2020 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 21,158 $ 21,409 $ 23,112 $ 22,367 Costs of revenues $ 8,487 $ 8,946 $ 9,493 $ 9,839 Net loss $ (528 ) $ (3,652 ) $ (2,734 ) $ (33,449 ) Net loss per share: Basic $ (0.02 ) $ (0.11 ) $ (0.08 ) $ (0.91 ) Diluted $ (0.02 ) $ (0.11 ) $ (0.08 ) $ (0.91 ) Year Ended December 31, 2019 Q1 Q2 Q3 Q4 (In thousands, except for per share amounts) Total revenues $ 20,541 $ 20,568 $ 21,914 $ 22,562 Costs of revenues $ 7,867 $ 7,832 $ 8,715 $ 9,059 Net loss $ (2,691 ) $ (710 ) $ (687 ) $ (1,330 ) Net loss per share: Basic $ (0.08 ) $ (0.02 ) $ (0.02 ) $ (0.04 ) Diluted $ (0.08 ) $ (0.02 ) $ (0.02 ) $ (0.04 )

Note 1 - Description of Busin_3

Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Gain (Loss) on Investments, Total	$ 0
Other than Temporary Impairment Losses, Investments, Total	0
Short-term Investments, Total	114,981	$ 0
Restricted Cash, Total	3,500	0
Unbilled Receivables, Current	7,200	7,400
Contract with Customer, Asset, Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	$ 2,000	$ 4,100
Number of Operating Segments	1
Number of Reporting Units	1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Capitalized Computer Software, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Capitalized Computer Software, Useful Life (Year)	6 years
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash, Total	$ 3,500
Other Noncurrent Assets [Member]
Capitalized Computer Software, Net, Ending Balance	$ 400
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	2	3
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage	27.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]
Concentration Risk, Percentage		53.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	1	1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	23.00%	31.00%

Note 1 - Description of Busin_4

Note 1 - Description of Business and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Balance		$ 10,486	$ 9,808
Charged to Expense		31,373	678
Charged Against Revenue		0	0
Balance		41,859	10,486
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance		213	332
Charged to Expense	[1]	0	0
Charged Against Revenue	[1]	800	0
Deductions/ Write-offs of Accounts		(50)	(119)
Balance		$ 963	$ 213
[1]	Additions to the accounts receivable reserve for doubtful accounts are charged to bad debt expense. Additions to the receivable reserve for billing adjustments are charged against revenue.

Note 1 - Description of Busin_5

Note 1 - Description of Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Computer Equipment [Member]
Property, plant and equipment, useful life (Year)	3 years
Software and Software Development Costs [Member]
Property, plant and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years
Laboratory and Test Equipment [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Laboratory and Test Equipment [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years

Note 2 - Revenue 1 (Details Tex

Note 2 - Revenue 1 (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0
Contract with Customer, Liability, Noncurrent	1,200	2,300
Contract with Customer, Liability, Revenue Recognized	10,700	8,800
Revenue, Remaining Performance Obligation, Amount	108,100
Contract with Customer, Performance Obligation Satisfied in Previous Period	100	3,200
Capitalized Contract Cost, Amortization	549	448
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	3,700	3,600
Capitalized Contract Cost, Net, Total	800	400
Deferred Costs, Total		300
Other Noncurrent Assets [Member]
Capitalized Contract Cost, Net, Total	$ 900	400
Deferred Costs, Total		$ 200
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]
Concentration Risk, Percentage	58.00%	58.00%

Note 2 - Revenue 2 (Details Tex

Note 2 - Revenue 2 (Details Textual) - Software License and Related Services Agreement [Member] - Advantest America, Inc. [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01	Dec. 31, 2020
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	2 years
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	3 years

Note 2 - Revenue - Disaggregati

Note 2 - Revenue - Disaggregation of Revenue (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Percent of revenues	100.00%	100.00%
Transferred over Time [Member]
Percent of revenues	63.00%	66.00%
Transferred at Point in Time [Member]
Percent of revenues	37.00%	34.00%

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	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.00015	$ 0.00015
Proceeds from Issuance of Common Stock		$ 65,078	$ 0
Revenue from Contract with Customer, Including Assessed Tax		88,046	$ 85,585
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
Revenue from Contract with Customer, Including Assessed Tax		3,400
Related Party Transaction, Due from (to) Related Party, Total		300
Contract with Customer, Liability, Total		5,900
Commercial Agreement With Advantest [Member]
Costs and Expenses, Related Party		$ 0

Note 4 - Business Combination_2

Note 4 - Business Combination (Details Textual) - USD ($) $ in Thousands	Dec. 01, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 28,580	$ 2,660
Cimetrix Incorporated [Member]
Business Combination, Consideration Transferred, Total	$ 35,000
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 28,600
Business Combination, Holdback Amount		3,500
Business Combination, Acquired Receivables, Gross Contractual Amount		1,600	1,600
Business Combination, Estimated Cash Payout to Certain Employees			1,400
Business Combination, Acquisition Related Costs		1,600
Cimetrix Incorporated [Member] | Accrued Compensation and Related Benefits [Member]
Business Combination, Accrued Estimated Cash Payout to Certain Employees		$ 300	$ 300

Note 4 - Business Combination -

Note 4 - Business Combination - Fair Values of Assets Acquired and Liabilities Assumed and the Related Useful Lives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill, Ending Balance	$ 15,774	$ 2,293	$ 2,293
Cimetrix Incorporated [Member]
Fair value of tangible assets (including cash of $5,900)	8,403
Goodwill, Ending Balance	13,481
Total assets acquired	41,683
Accounts payable and accrued expenses	1,437
Deferred revenue	391
Operating lease liabilities	132
Deferred tax liabilities	1,743
Total liabilities assumed	3,703
Total consideration, net	37,980
Cimetrix Incorporated [Member] | In Process Research and Development [Member]
Fair value of indefinite-lived intangible assets	3,635
Cimetrix Incorporated [Member] | Developed Technology Rights [Member]
Fair value of finite-lived intangible assets	$ 12,541
Finite-lived intangible assets, amortization period (Year)	8 years
Cimetrix Incorporated [Member] | Customer Relationships [Member]
Fair value of finite-lived intangible assets	$ 1,967
Finite-lived intangible assets, amortization period (Year)	10 years
Cimetrix Incorporated [Member] | Noncompete Agreements [Member]
Fair value of finite-lived intangible assets	$ 848
Finite-lived intangible assets, amortization period (Year)	3 years
Cimetrix Incorporated [Member] | Trademarks and Trade Names [Member]
Fair value of finite-lived intangible assets	$ 808
Finite-lived intangible assets, amortization period (Year)	10 years

Note 4 - Business Combination_3

Note 4 - Business Combination - Fair Values of Assets Acquired and Liabilities Assumed and the Related Useful Lives (Details) (Parentheticals) $ in Millions	Dec. 31, 2020USD ($)
Developed Technology Rights [Member] | Cimetrix Incorporated [Member]
Fair value of cash	$ 5.9

Note 5 - Property and Equipme_3

Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Depreciation, Depletion and Amortization, Nonproduction, Total	$ 6.7	$ 6
DFI Test Equipment [Member]
Construction in Progress, Gross	$ 18.9	$ 16.6

Note 5 - Property and Equipme_4

Note 5 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, gross	$ 75,537	$ 70,218
Less: accumulated depreciation and amortization	(36,295)	(29,420)
Total	39,242	40,798
Computer Equipment [Member]
Property and equipment, gross	11,585	10,880
Software and Software Development Costs [Member]
Property and equipment, gross	5,451	4,690
Furniture and Fixtures [Member]
Property and equipment, gross	2,507	2,395
Leasehold Improvements [Member]
Property and equipment, gross	6,255	6,095
Laboratory and Test Equipment [Member]
Property and equipment, gross	3,451	4,933
Test Equipment [Member]
Property and equipment, gross	26,010	22,980
Construction in Progress [Member]
Property and equipment, gross	$ 20,278	$ 18,245

Note 6 - Goodwill and Intangi_3

Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill, Ending Balance	$ 15,774	$ 2,293	$ 2,293
Intangible Assets, Net (Excluding Goodwill), Total	$ 24,573	6,221
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)	7 years 4 months 24 days
Amortization of Intangible Assets, Total	$ 1,400	1,200
Impairment of Intangible Assets, Finite-lived	$ 0	$ 0

Note 6 - Goodwill and Intangi_4

Note 6 - Goodwill and Intangible Assets - Change in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 2,293	$ 2,293
Addition	13,481	0
Balance	$ 15,774	$ 2,293

Note 6 - Goodwill and Intangi_5

Note 6 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Amortization	$ (22,715)	$ (21,269)
Net Carrying Amount	20,938
Gross Carrying Amount, Total	47,288	27,490
Net Carrying Amount, Total	24,573	6,221
In Process Research and Development [Member]
In-process R&D	3,635	0
Customer Relationships [Member]
Gross Carrying Amount	9,407	7,440
Accumulated Amortization	(5,398)	(4,935)
Net Carrying Amount	$ 4,009	2,505
Customer Relationships [Member] | Minimum [Member]
Amortization Period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 30,000	17,460
Accumulated Amortization	(14,987)	(14,101)
Net Carrying Amount	$ 15,013	3,359
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Trademarks and Trade Names [Member]
Gross Carrying Amount	$ 1,598	790
Accumulated Amortization	(706)	(673)
Net Carrying Amount	$ 892	117
Trademarks and Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trademarks and Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Patents [Member]
Gross Carrying Amount	$ 1,800	1,800
Accumulated Amortization	(1,600)	(1,560)
Net Carrying Amount	$ 200	240
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Noncompete Agreements [Member]
Amortization Period (Year)	3 years
Gross Carrying Amount	$ 848	0
Accumulated Amortization	(24)	0
Net Carrying Amount	$ 824	$ 0

Note 6 - Goodwill and Intangi_6

Note 6 - Goodwill and Intangible Assets - Annual Amortization of Identifiable Intangible Assets (Details) $ in Thousands	Dec. 31, 2020USD ($)
2021	$ 3,221
2022	3,013
2023	2,990
2024	2,592
2025	2,427
2026 and thereafter	6,695
Total future amortization expense	$ 20,938

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Liability, Total	$ 1,000
Operating Lease, Liability, Current	$ 1,926	$ 1,867

Note 7 - Leases - Lease Cost (D

Note 7 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease expense	$ 1,828	$ 1,840
Short-term lease and variable lease expense	545	492
Total lease expense	$ 2,373	$ 2,332
Weighted average remaining lease term under operating ROU leases (in years) (Year)	6 years 4 months 24 days	7 years 2 months 12 days
Weighted average discount rate for operating lease liabilities	5.24%	5.25%
Operating lease liabilities arising from obtaining right-of-use assets	$ 286	$ 333

Note 7 - Leases - Maturity of O

Note 7 - Leases - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Dec. 31, 2020USD ($)	[1]
2021	$ 1,967
2022	1,704
2023	1,387
2024	1,074
2025	1,091
2026 and thereafter	2,703
Total future minimum lease payments	9,926
Less: Interest(2)	(1,484)	[2]
Present value of operating lease liabilities(3)	$ 8,442	[3]
[1]	As of December 31, 2020, the total operating lease liability includes $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 $1.9 million as of December 31, 2020.

Note 8 - Commitments and Cont_2

Note 8 - Commitments and Contingencies (Details Textual) $ in Millions	Dec. 31, 2020USD ($)
Purchase Obligation, Total	$ 13.4

Note 9 - Stockholders' Equity (

Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jul. 30, 2020	May 28, 2020	May 29, 2018	Dec. 31, 2020	Dec. 31, 2019	May 28, 2020
Proceeds from Issuance of Common Stock				$ 65,078	$ 0
Treasury Stock, Value, Acquired, Cost Method					$ 9,767
The 2018 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount			$ 25,000
Treasury Stock, Shares, Acquired (in shares)		786,000		0	785,000
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
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 10 - Employee Benefit Pl_3

Note 10 - Employee Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Nov. 16, 2011	Jul. 31, 2001	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2001	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)			57,000	87,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			456,000	745,000		1,027,000
Share-based Payment Arrangement, Amount Capitalized			$ 190	$ 309
Share Price (in dollars per share)			$ 21.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 2,200	1,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 300
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			60.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 0
Software Development [Member]
Share-based Payment Arrangement, Amount Capitalized			200	$ 300
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 300
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			$ 21,900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			2 years 7 months 6 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)			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			$ 100
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
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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			4,200,000
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

Note 10 - Employee Benefit Pl_4

Note 10 - Employee Benefit Plans - Stock Options, Valuation Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted average fair value of purchase rights granted during the period (in dollars per share)	$ 5.75	$ 5
The 2010 Purchase Plan [Member]
Expected life (in years) (Year)	1 year 3 months	1 year 3 months
Volatility	34.25%	44.85%
Risk-free interest rate	1.43%	2.49%
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
Employee Stock Purchase Plan [Member]
Expected life (Year)	4 years 5 months 12 days	4 years 5 months 15 days
Volatility	40.90%	41.56%
Risk-free interest rate	0.60%	1.86%
Expected dividend	0.00%	0.00%
Twenty Eleven Stock Incentive Plan [Member]
Weighted average fair value of options granted during the period (in dollars per share)	$ 5.75	$ 5

Note 10 - Employee Benefit Pl_5

Note 10 - Employee Benefit Plans - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation expenses	$ 12,463	$ 11,423
Cost of Sales [Member]
Stock-based compensation expenses	3,454	3,185
Research and Development Expense [Member]
Stock-based compensation expenses	4,800	4,764
Selling, General and Administrative Expenses [Member]
Stock-based compensation expenses	$ 4,209	$ 3,474

Note 10 - Employee Benefit Pl_6

Note 10 - Employee Benefit Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Outstanding (in shares)	745	1,027
Outstanding, weighted average exercise price (in dollars per share)	$ 10.64	$ 9.75
Granted (in shares)	24	102
Exercised (in shares)	(246)	(238)
Exercised, weighted average exercise price (in dollars per share)	$ 10.46	$ 5.41
Canceled (in shares)	(57)	(87)
Canceled, weighted average exercise price (in dollars per share)	$ 11.65	$ 14.57
Expired (in shares)	(10)	(59)
Expired, weighted average exercise price (in dollars per share)	$ 10.06	$ 15.83
Outstanding (in shares)	456	745
Outstanding, weighted average exercise price (in dollars per share)	$ 10.95	$ 10.64
Outstanding, weighted average remaining contractual (Year)	3 years 2 months 1 day
Outstanding, aggregate intrinsic value	$ 4,864
Vested and expected to vest (in shares)	449
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.88
Vested and expected to vest, weighted average remaining contractual term (Year)	3 years 29 days
Vested and expected to vest, aggregate intrinsic value	$ 4,818
Exercisable (in shares)	379
Exercisable, weighted average exercise price (in dollars per share)	$ 10.15
Exercisable, weighted average remaining contractual term (Year)	2 years 18 days
Exercisable, aggregate intrinsic value	$ 4,342

Note 10 - Employee Benefit Pl_7

Note 10 - Employee Benefit Plans - Stock Options Activity (Details) (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted average fair value (in dollars per share)	$ 5.75	$ 5
Weighted average fair value (in dollars per share)	$ 5.75	$ 5

Note 10 - Employee Benefit Pl_8

Note 10 - Employee Benefit Plans - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Nonvested, Balance (in shares)	1,887	1,835
Nonvested, weighted average grant date fair value (in dollars per share)	$ 12.30	$ 11.93
Granted (in shares)	890	952
Granted, weighted average grant date fair value (in dollars per share)	$ 21.31	$ 13.52
Vested (in shares)	(867)	(710)
Vested, weighted average grant date fair value (in dollars per share)	$ 13.25	$ 13.05
Forfeited (in shares)	(163)	(190)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 13.23	$ 12.18
Nonvested, Balance (in shares)	1,747	1,887
Nonvested, weighted average grant date fair value (in dollars per share)	$ 16.33	$ 12.30

Note 11 - Restructuring Charg_3

Note 11 - Restructuring Charges (Details Textual) - USD ($) $ in Thousands	12 Months Ended		27 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Restructuring Charges, Total	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Restructuring Charges, Total	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member] | Employee Severance [Member]
Restructuring Charges, Total			$ 700

Note 11 - Restructuring Charg_4

Note 11 - Restructuring Charges - Restructuring Liability Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring charges	$ 0	$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Beginning balance	0	244
Restructuring charges	0	92
Cash payments	0	(336)
Ending balance	$ 0	$ 0

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (18,400,000)	$ (8,700,000)
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 300,000	$ 1,300,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 41,859,000	$ 10,486,000
Deferred Tax Assets, Net, Total	228,000	22,866,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	800,000	800,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense (Reversal)	33,000	(1,000)
Unrecognized Tax Benefits, Ending Balance	14,300,000	13,615,000	$ 13,292,000	$ 12,889,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2,200,000
Unrecognized Tax Benefits In Long Term Liabilities	2,900,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued in Long Term Liabilities	800,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	12,200,000
California R&D Tax Credits [Member]
Deferred Tax Assets, Valuation Allowance, Total	41,900,000	10,500,000
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount	19,500,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	$ 30,300,000
Open Tax Year	2013 2014 2015 2017 2018 2019 2020
Domestic Tax Authority [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards, Total		$ 8,700,000
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount	$ 20,300,000
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Open Tax Year	2016 2017 2018 2019 2020

Note 12 - Income Taxes - Income

Note 12 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current	$ (1,325)	$ (107)
Deferred	21,056	(4,534)
Current	238	312
Withholding	2,392	2,385
Deferred	(58)	2
Total income tax provision (benefit)	$ 22,303	$ (1,942)

Note 12 - Income Taxes - Inco_2

Note 12 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Federal statutory tax provision	$ (3,793)	$ (1,546)
State tax provision	703	(85)
Stock compensation expense	(602)	234
Tax credits	(3,488)	(2,974)
Foreign tax, net	2,443	2,430
Tax law changes	(2,237)	0
Business combination costs	356	0
Change in valuation allowance	29,034	0
Other	(113)	(1)
Total income tax provision (benefit)	$ 22,303	$ (1,942)

Note 12 - Income Taxes - Deferr

Note 12 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss carry forward	$ 8,085	$ 4,596
Research and development and other credit carry forward	24,723	18,944
Foreign tax credit carry forward	9,435	6,443
Accruals deductible in different periods	3,471	1,968
Leases	1,669	1,850
Intangible assets	0	741
Stock-based compensation	1,220	1,271
Total deferred tax assets	48,603	35,813
Less: valuation allowance	(41,859)	(10,486)
Deferred tax assets, net of valuation allowance	6,744	25,327
Deferred tax liabilities
Property and equipment, net	(629)	(611)
Operating lease right-of-use assets	(1,669)	(1,850)
Intangible assets	4,218	0
Deferred tax liabilities	(6,516)	(2,461)
Net deferred tax assets	$ 228	$ 22,866

Note 12 - Income Taxes - Unreco

Note 12 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gross unrecognized tax benefits	$ 13,615	$ 13,292	$ 12,889
Increases in tax positions for current year	1,024	667	664
Increases in tax positions for prior years	71	1	0
Lapse in statute of limitations	(410)	(345)	(261)
Gross unrecognized tax benefits	$ 14,300	$ 13,615	$ 13,292

Note 12 - Income Taxes - Valuat

Note 12 - Income Taxes - Valuation Allowance of Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 10,486	$ 9,808
Charged to Expense	31,373	678
Charged Against Revenue	0	0
Balance	$ 41,859	$ 10,486

Note 13 - Net Loss Per Share -

Note 13 - Net Loss Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net loss	$ (33,449)	$ (2,734)	$ (3,652)	$ (528)	$ (1,330)	$ (687)	$ (710)	$ (2,691)	$ (40,363)	$ (5,418)
Basic weighted-average shares outstanding (in shares)									34,458	32,411
Effect of dilutive options and restricted stock units (in shares)									0	0
Diluted weighted-average shares outstanding (in shares)									34,458	32,411
Basic (in dollars per share)	$ (0.91)	$ (0.08)	$ (0.11)	$ (0.02)	$ (0.04)	$ (0.02)	$ (0.02)	$ (0.08)	$ (1.17)	$ (0.17)
Diluted (in dollars per share)	$ (0.91)	$ (0.08)	$ (0.11)	$ (0.02)	$ (0.04)	$ (0.02)	$ (0.02)	$ (0.08)	$ (1.17)	$ (0.17)

Note 13 - Net Loss Per Share _2

Note 13 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Anti-dilutive securities (in shares)	1,413	1,594
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	332	538
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	921	915
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)	160	141

Note 14 - Customer and Geogra_3

Note 14 - Customer and Geographic Information (Details Textual)	12 Months Ended
	Dec. 31, 2020
Number of Operating Segments	1
Number of Reportable Segments	1

Note 14 - Customer and Geogra_4

Note 14 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member]
Concentration risk	23.00%	31.00%
Accounts Receivable [Member] | Customer A [Member]
Concentration risk	16.00%	27.00%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk		14.00%
Accounts Receivable [Member] | Customer C [Member]
Concentration risk	11.00%	12.00%

Note 14 - Customer and Geogra_5

Note 14 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 88,046	$ 85,585
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues	$ 88,046	$ 85,585
Concentration risk	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Revenues	$ 36,723	$ 36,169
Concentration risk	42.00%	42.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | CHINA
Revenues	$ 13,776	$ 13,960
Concentration risk	16.00%	16.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | TAIWAN, PROVINCE OF CHINA
Revenues	$ 8,038	$ 8,574
Concentration risk	9.00%	10.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Rest of the World [Member]
Revenues	$ 29,509	$ 26,882
Concentration risk	33.00%	32.00%

Note 14 - Customer and Geogra_6

Note 14 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long-lived assets, net	$ 45,914	$ 48,407
UNITED STATES
Long-lived assets, net	43,663	46,000
Rest of the World [Member]
Long-lived assets, net	$ 2,251	$ 2,407

Note 15 - Financial Instrumen_3

Note 15 - Financial Instruments (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Foreign Exchange Contract [Member] | Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ (0.2)	$ (0.6)

Note 15 - Financial Instrumen_4

Note 15 - Financial Instruments - Fair Value, Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Total		$ 132,993
Fair Value, Inputs, Level 1 [Member]
Total		132,993
Fair Value, Inputs, Level 2 [Member]
Total		0
Fair Value, Inputs, Level 3 [Member]
Total		0
Money Market Funds [Member]
Money market mutual funds		18,012	$ 27,644
Money market mutual funds		18,012	27,644
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market mutual funds		18,012	27,644
Money market mutual funds		18,012	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]	114,981
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
U.S. Treasury bills	[1]	114,981
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 December 31, 2020.

Note 16 - Selected Quarterly _3

Note 16 - Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Total revenues	$ 22,367	$ 23,112	$ 21,409	$ 21,158	$ 22,562	$ 21,914	$ 20,568	$ 20,541
Costs of revenues	9,839	9,493	8,946	8,487	9,059	8,715	7,832	7,867
Net loss	$ (33,449)	$ (2,734)	$ (3,652)	$ (528)	$ (1,330)	$ (687)	$ (710)	$ (2,691)	$ (40,363)	$ (5,418)
Basic (in dollars per share)	$ (0.91)	$ (0.08)	$ (0.11)	$ (0.02)	$ (0.04)	$ (0.02)	$ (0.02)	$ (0.08)	$ (1.17)	$ (0.17)
Diluted (in dollars per share)	$ (0.91)	$ (0.08)	$ (0.11)	$ (0.02)	$ (0.04)	$ (0.02)	$ (0.02)	$ (0.08)	$ (1.17)	$ (0.17)