PDF Solutions (PDFS) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Document Information [Line Items]
Entity Registrant Name	PDF SOLUTIONS INC
Entity Central Index Key	0001120914
Trading Symbol	pdfs
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		32,350,187
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Title of 12(b) Security	Common Stock, $0.00015 par value

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 100,259	$ 96,089
Accounts receivable, net of allowance for doubtful accounts of $339 in 2019 and $332 in 2018	34,556	51,570
Prepaid expenses and other current assets	8,026	9,562
Total current assets	142,841	157,221
Property and equipment, net	38,969	35,681
Operating lease right-of-use assets, net	7,581
Goodwill	2,293	1,923
Intangible assets, net	6,538	5,064
Deferred tax assets	23,100	19,044
Other non-current assets	8,025	6,972
Total assets	229,347	225,905
Current liabilities:
Accounts payable	2,203	2,454
Accrued compensation and related benefits	4,313	4,727
Accrued and other current liabilities	2,452	3,235
Operating lease liabilities – current portion	1,826
Deferred revenues – current portion	8,612	8,477
Billings in excess of recognized revenues	1,219	635
Total current liabilities	20,625	19,528
Long-term income taxes payable	3,565	3,751
Non-current operating lease liabilities	7,726
Other non-current liabilities	2,444	2,831
Total liabilities	34,360	26,110
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 41,596 and 40,677, respectively; shares outstanding 32,350 and 32,382, respectively	5	5
Additional paid-in-capital	322,183	310,660
Treasury stock at cost, 9,246 and 8,295 shares, respectively	(90,908)	(79,142)
Accumulated deficit	(34,540)	(30,452)
Accumulated other comprehensive loss	(1,753)	(1,276)
Total stockholders’ equity	194,987	199,795
Total liabilities and stockholders’ equity	$ 229,347	$ 225,905

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts receivable, allowance	$ 339	$ 332
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)	41,596	40,677
Common stock, shares outstanding (in shares)	32,350	32,382
Treasury stock, shares (in shares)	9,246	8,295

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Revenues	$ 21,914	$ 20,213	$ 63,023	$ 66,069
Cost of Solutions
Direct costs of solutions	8,571	10,539	23,984	32,651
Amortization of acquired technology	144	144	431	431
Total cost of solutions	8,715	10,683	24,415	33,082
Gross profit	13,199	9,530	38,608	32,987
Operating expenses:
Research and development	8,435	6,755	23,993	21,100
Selling, general and administrative	5,990	5,507	19,940	17,801
Amortization of other acquired intangible assets	174	108	436	326
Restructuring charges			92
Total operating expenses	14,599	12,370	44,461	39,227
Loss from operations	(1,400)	(2,840)	(5,853)	(6,240)
Interest and other income (expense), net	202	223	307	283
Loss before income taxes	(1,198)	(2,617)	(5,546)	(5,957)
Income tax benefit	(511)	(535)	(1,458)	(1,355)
Net loss	(687)	(2,082)	(4,088)	(4,602)
Other comprehensive loss:
Foreign currency translation adjustments, net of tax	(461)	(168)	(477)	(414)
Comprehensive loss	$ (1,148)	$ (2,250)	$ (4,565)	$ (5,016)
Net loss per share:
Basic (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)
Diluted (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)
Weighted average common shares:
Basic (in shares)	32,392	32,184	32,405	32,105
Diluted (in shares)	32,392	32,184	32,405	32,105
Solutions [Member]
Revenues:
Revenues	$ 16,208	$ 13,976	$ 46,298	$ 47,431
Gainshare Performance Incentives [Member]
Revenues:
Revenues	$ 5,706	$ 6,237	$ 16,725	$ 18,638

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2017	32,112		7,688
Balances at Dec. 31, 2017	$ 5	$ 297,950	$ (71,793)	$ (27,089)	$ (705)	$ 198,368
Issuance of common stock in connection with employee stock purchase plan (in shares)	108
Issuance of common stock in connection with employee stock purchase plan		1,007				1,007
Issuance of common stock in connection with exercise of options (in shares)	8
Issuance of common stock in connection with exercise of options		39				39
Vesting of restricted stock units (in shares)	74
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			36
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (557)			(557)
Repurchases of common stock (in shares)	(338)		338
Repurchases of common stock			$ (4,123)			(4,123)
Stock-based compensation		2,871				2,871
Comprehensive income (loss)				(424)	525	101
Cumulative-effect adjustment from adoption of ASU 2014-09 at Dec. 31, 2017				4,353		4,353
Balances (in shares) at Mar. 31, 2018	31,964		8,062
Balances at Mar. 31, 2018	$ 5	301,867	$ (76,473)	(23,160)	(180)	202,059
Balances (in shares) at Dec. 31, 2017	32,112		7,688
Balances at Dec. 31, 2017	$ 5	297,950	$ (71,793)	(27,089)	(705)	198,368
Comprehensive income (loss)						(5,016)
Cumulative-effect adjustment from adoption of ASU 2014-09 at Dec. 31, 2017				4,353		4,353
Balances (in shares) at Sep. 30, 2018	32,257		8,252
Balances at Sep. 30, 2018	$ 5	308,098	$ (78,751)	(27,338)	(1,119)	200,895
Balances (in shares) at Mar. 31, 2018	31,964		8,062
Balances at Mar. 31, 2018	$ 5	301,867	$ (76,473)	(23,160)	(180)	202,059
Issuance of common stock in connection with exercise of options (in shares)	51
Issuance of common stock in connection with exercise of options		377				377
Vesting of restricted stock units (in shares)	159
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			63
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (819)			(819)
Repurchases of common stock (in shares)	(99)		99
Repurchases of common stock			$ (1,125)			(1,125)
Stock-based compensation		2,699				2,699
Comprehensive income (loss)				(2,096)	(771)	(2,867)
Balances (in shares) at Jun. 30, 2018	32,075		8,224
Balances at Jun. 30, 2018	$ 5	304,943	$ (78,417)	(25,256)	(951)	200,324
Issuance of common stock in connection with employee stock purchase plan (in shares)	92
Issuance of common stock in connection with employee stock purchase plan		824				824
Issuance of common stock in connection with exercise of options (in shares)	9
Issuance of common stock in connection with exercise of options		53				53
Vesting of restricted stock units (in shares)	81
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			28
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (334)			(334)
Stock-based compensation		2,278				2,278
Comprehensive income (loss)				(2,082)	(168)	(2,250)
Balances (in shares) at Sep. 30, 2018	32,257		8,252
Balances at Sep. 30, 2018	$ 5	308,098	$ (78,751)	(27,338)	(1,119)	200,895
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	310,660	$ (79,142)	(30,452)	(1,276)	199,795
Issuance of common stock in connection with employee stock purchase plan (in shares)	87
Issuance of common stock in connection with employee stock purchase plan		782				782
Issuance of common stock in connection with exercise of options (in shares)	87
Issuance of common stock in connection with exercise of options		518				518
Vesting of restricted stock units (in shares)	104
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			54
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (557)			(557)
Repurchases of common stock (in shares)	(314)		314
Repurchases of common stock			$ (3,917)			(3,917)
Stock-based compensation		3,469				3,469
Comprehensive income (loss)				(2,691)	(52)	(2,743)
Balances (in shares) at Mar. 31, 2019	32,346		8,663
Balances at Mar. 31, 2019	$ 5	315,429	$ (83,616)	(33,143)	(1,328)	197,347
Balances (in shares) at Dec. 31, 2018	32,382		8,295
Balances at Dec. 31, 2018	$ 5	310,660	$ (79,142)	(30,452)	(1,276)	$ 199,795
Issuance of common stock in connection with exercise of options (in shares)						217
Comprehensive income (loss)						$ (4,565)
Balances (in shares) at Sep. 30, 2019	32,350		9,246
Balances at Sep. 30, 2019	$ 5	322,183	$ (90,908)	(34,540)	(1,753)	194,987
Balances (in shares) at Mar. 31, 2019	32,346		8,663
Balances at Mar. 31, 2019	$ 5	315,429	$ (83,616)	(33,143)	(1,328)	197,347
Issuance of common stock in connection with exercise of options (in shares)	69
Issuance of common stock in connection with exercise of options		326				326
Vesting of restricted stock units (in shares)	176
Vesting of restricted stock units
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in shares)			72
Purchases of treasury stock in connection with tax withholdings on restricted stock grants			$ (918)			(918)
Repurchases of common stock (in shares)	(300)		300
Repurchases of common stock			$ (3,790)			(3,790)
Stock-based compensation		2,601				2,601
Comprehensive income (loss)				(710)	36	(674)
Balances (in shares) at Jun. 30, 2019	32,291		9,035
Balances at Jun. 30, 2019	$ 5	318,356	$ (88,324)	(33,853)	(1,292)	194,892
Issuance of common stock in connection with employee stock purchase plan (in shares)	85
Issuance of common stock in connection with employee stock purchase plan		751				751
Issuance of common stock in connection with exercise of options (in shares)	53
Issuance of common stock in connection with exercise of options		267				267
Vesting of restricted stock units (in shares)	92
Vesting of restricted stock units
Repurchases of common stock (in shares)	(171)		171
Repurchases of common stock			$ (2,060)			(2,060)
Stock-based compensation		2,809				2,809
Comprehensive income (loss)				(687)	(461)	(1,148)
Purchases of treasury stock in connection with tax withholdings on restricted stock grants and exercise of options (in shares)			40
Purchases of treasury stock in connection with tax withholdings on restricted stock grants and exercise of options			$ (524)			(524)
Balances (in shares) at Sep. 30, 2019	32,350		9,246
Balances at Sep. 30, 2019	$ 5	$ 322,183	$ (90,908)	$ (34,540)	$ (1,753)	$ 194,987

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net loss	$ (4,088)	$ (4,602)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	4,306	3,689
Stock-based compensation expense	8,642	7,825
Amortization of acquired intangible assets	867	757
Amortization of costs capitalized to obtain revenue contracts	344	278
Adjustment to contingent consideration related to acquisition	36
Deferred taxes	(3,998)	(2,298)
Loss on disposal of property and equipment	130	4
Provision (reversal of allowance) for doubtful accounts and write-off of accounts receivable	67	(41)
Unrealized loss on foreign currency forward contract		59
Changes in operating assets and liabilities:
Accounts receivable	16,946	5,653
Prepaid expenses and other current assets	(236)	(3,722)
Other non-current assets	(966)	2,367
Accounts payable	(191)	(598)
Accrued compensation and related benefits	(431)	(1,377)
Accrued and other liabilities	(483)	(252)
Deferred revenues	1,482	632
Billings in excess of recognized revenues	584	669
Net cash provided by operating activities	23,011	9,043
Investing activities:
Proceeds from the sale of property and equipment	50
Purchases of property and equipment	(6,891)	(8,747)
Payment for business acquisition	(2,660)
Net cash used in investing activities	(9,501)	(8,747)
Financing activities:
Proceeds from exercise of stock options	983	469
Proceeds from employee stock purchase plan	1,534	1,832
Repurchases of common stock	(9,639)	(5,248)
Payments for taxes related to net share settlement of equity awards	(1,898)	(1,711)
Payment of contingent consideration related to acquisition	(206)
Net cash used in financing activities	(9,226)	(4,658)
Effect of exchange rate changes on cash and cash equivalents	(114)	(117)
Net change in cash and cash equivalents	4,170	(4,479)
Cash and cash equivalents, beginning of period	96,089	101,267
Cash and cash equivalents, end of period	100,259	96,788
Supplemental disclosure of cash flow information:
Cash paid during the period for taxes	2,454	1,616
Cash paid for amounts included in the measurement of operating lease liabilities	1,268
Supplemental disclosure of noncash operating, investing, and financing activities:
Stock-based compensation capitalized as software development costs	244
Property and equipment received and accrued in accounts payable and accrued and other liabilities	1,340	3,398
Advances for purchase of fixed assets transferred from prepaid assets to property and equipment	1,416
Tenant allowance paid by landlord for leasehold improvements		1,536
Common shares repurchased from a cashless exercise of stock options	$ 128

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10 10 X. not may 10 December 31, 2018. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2018, not Use of Estimates The preparation of financial statements in conformity with 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, impairment of goodwill and long-lived assets, accounting for stock-based compensation expense, and income taxes. Actual results could differ from those estimates. Reclassification of Prior Period Amount Certain prior period amounts have been reclassified to conform to current year presentation of reporting amortization of costs capitalized to obtain revenue contracts on the Condensed Consolidated Statements of Cash Flows. This reclassification had no Recently Adopted Accounting Standards Leases In February 2016, 2016 02, 842 2017 13, 2018 10, 2018 11, 2018 20 2019 01 842 842 12 842 December 15, 2018, not 842 January 1, 2019 not In addition, the Company elected the transition package of three not not 12 no The Company’s lease portfolio consists primarily of real estate assets, which include administrative and sales offices, and its research and development laboratory and clean room. Some of these leases also require the Company to pay maintenance, utilities, taxes, insurance, and other operating expenses associated with the leased space. Based upon the nature of the items leased and the structure of the leases, the Company’s leases are classified as operating leases and continue to be classified as operating leases under the new accounting standard. As a result of the adoption of the new lease accounting guidance, the Company recognized on January 1, 2019: ● operating lease liabilities of approximately $10.5 5.3%, ● operating lease ROU assets of approximately $8.7 $10.5 1 $0.3 2 $1.5 The adoption of the new lease accounting standard did not not 5 Income Statement – Reporting Comprehensive Income (Loss) In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 January 1, 2019, not Compensation - Stock Compensation In June 2018, 2018 07, 718 718, January 1, 2019, not FASB U pdates C ertain SEC G uidance in the Codification In July 2019, No. 2019 07, No. 33 10532, 33 10231 33 10442, July 2019. third 2019, not first 2019. Management has reviewed other recently issued accounting pronouncements and has determined there are not Accounting Standards Not In June 2016, 2016 13, 326 2016 13 2018 19, 326, 2019 04, 326, 815, 825, 2019 05, 326 326 326 326 first 2020. not In January 2017, No. 2017 04, 350 2 December 15, 2019, not In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 not

Note 2 - Business Combination

Note 2 - Business Combination	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Business Combination Disclosure [Text Block]	2. On April 29, 2019 ( $2.7 The Company accounted for this acquisition as a business combination. This method requires that assets acquired and liabilities assumed in a business combination be recognized at their fair values as of the Acquisition Date. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. The goodwill recorded from this acquisition represents business benefits the Company anticipates from the acquired workforce and expectation for expanded sales opportunities in advanced data analytics for semiconductors and electronics. The amount of goodwill expected to be deductible for tax purposes is $370,000. not not Intangible assets consist of developed technology and customer relationships. The value assigned to intangibles are based on estimates and judgments regarding expectations for success and life cycle of intangibles acquired. The following table summarizes the allocation of the fair values of the assets acquired and liabilities assumed and the related useful lives, where applicable: (in thousands) Amortization period (years) Finite-lived intangible assets: Developed technology $ 1,640 9 Customer relationship 700 9 Deferred revenue (50 ) Net asset acquired $ 2,290 Goodwill 370 Purchase consideration $ 2,660

Note 3 - Revenue From Contracts

Note 3 - Revenue From Contracts With Customers	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	3. The Company derives revenue from two Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services. The Company determines revenue recognition through the following five ● 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. 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, generally on a relative basis using its standalone selling price. The Company does not one not three nine September 30, 2019 2018. Nature of Products and Services Solutions revenue – The Company recognizes revenue for each element of solutions revenue as follows: The Company licenses the majority of its software products separately from project-based solution implementation service contracts, in particular, its Exensio platform and related products. The majority of this software is delivered as on-premise software licenses, while others can be delivered entirely or partially through Software-as-a-Service (SaaS) or cloud delivery models. Revenue from perpetual ( one The Company also licenses the Design-for-Inspection (“DFI”) system as a separate component of fixed-price service contracts that are not The Company generates a portion of its solutions revenue from fixed-price, project-based solution implementation service contracts that are associated with its classic yield ramp business, which services are delivered over a specific period of time. Revenue under these project–based contracts for solution implementation services is recognized as services are performed, using a percentage of completion method based on costs or labor-hours inputs, depending on 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 costs or hours at completion 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 typically includes some of its products and other technology as components of its fixed-price, project-based services contracts. In such instances, the Company determines whether the services performed and products/technology included, are distinct. In most cases, the arrangement is a single performance obligation and therefore follows the pattern of transfer as the service is provided. The Company applies a measure of progress (typically hours-to-hours or cost-to-cost) to any fixed consideration. As a result, revenue is generally recognized over the period the services are performed using percentage of completion method. This results in revenue recognition that corresponds with the value to the client for the services transferred to date relative to the remaining services promised. Gainshare Performance Incentives — When the Company enters into a project-based solution implementation services contract, the contract usually includes two 1 2 Disaggregation of revenue The Company disaggregates revenue from contracts with customers into geographical regions, major contract performance obligations, and timing of transfer of goods and services. 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 following table shows the revenues from contracts with customers by the nature of transactions (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Licenses and Gainshare Performance Incentives $ 6,454 $ 7,729 $ 20,360 $ 22,044 Support and Services 15,267 11,905 42,298 43,095 Other 193 579 365 930 Total $ 21,914 $ 20,213 $ 63,023 $ 66,069 Licenses and Gainshare Performance Incentives revenue is comprised of (i) the software license fees for perpetual and time-based software license contracts where the standalone selling prices are estimable by the Company, or distinct and separate performance obligations; and (ii) the variable fee component of the Company’s yield improvement service contracts, or Gainshare Performance Incentives, which is usually recognized as revenue subsequent to the delivery of all contractual services and performance obligations. The services component of such contracts, including recurring fees for unspecified software updates and technical support, is presented as support and services. The Company’s performance obligations are satisfied either over time or at a point-in-time. The following table represents a disaggregation of revenue by timing of revenue: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Over time 70 % 59 % 67 % 66 % Point-in-time 30 % 41 % 33 % 34 % Total 100 % 100 % 100 % 100 % International revenues accounted for approximately 66% 60% three nine September 30, 2019, 59% 58% three nine September 30, 2018, 11. Significant Judgments Judgments and estimates are required under ASU No. 2014 09, 606 606 may may In services arrangements, the Company typically satisfies the performance obligation and recognizes revenue over time. In Design-to-silicon-yield service arrangements, the performance obligation is satisfied over time either because the client controls the asset as it is created (e.g., when the asset is built at the customer site) or because the Company’s performance does not For revenue under project-based contracts for fixed-price solution 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 and services, including professional services, technical support services, and rights to unspecified updates to a customer. Determining whether products, licenses and services are distinct performance obligations that should be accounted for separately, or not not not may one may The Company is required to record Gainshare royalty revenue in the same period in which the usage occurs. Because the Company generally does not Contract Balances The Company performs its obligations under a contract with a customer by transferring products or services in exchange for consideration from the customer. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a receivable, a contract asset or a contract liability. The Company classifies the right to consideration in exchange for products or services transferred to a client 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 solution implementation service contracts when the costs or labor-hours input method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the client, and the right to consideration is subject to milestone completion or client acceptance. The contract assets are generally classified as current and are recorded on a net basis with deferred revenue (i.e., contract liabilities) at the contract level. At September 30, 2019 December 31, 2018, $3.0 $2.7 Contract liabilities primarily consist of deferred revenues and billings in excess of recognized revenues. Deferred revenues consist substantially of amounts invoiced in advance of revenue recognition and is recognized as the revenue recognition criteria are met. Deferred revenues that will be recognized during the succeeding twelve $2.4 $1.0 September 30, 2019 December 31, 2018. twelve three September 30, 2019 2018, $4.4 nine September 30, 2019, 2018, $13.0 $12.0 At September 30, 2019, $35.5 two five not not one Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 90 not not The adjustment to revenue recognized in the three September 30, 2019 2018 $0.3 $1.3 nine September 30, 2019 2018 $0.1 $1.6 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. As a result, these costs will need to be capitalized and amortized over an appropriate period, which may not not September 30, 2019 December 31, 2018 $0.7 $0.5 three September 30, 2019 2018 $0.1 nine September 30, 2019 2018 $0.3 no 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 client of the services to which the asset relates and recorded as a component of cost of revenues. The Company also incurred certain direct costs to provide solution implementation 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. The Company also defers costs from arrangements that required it to defer the revenues, typically due to the pattern of transfer of the performance obligations in the contract. These costs are recognized in proportion to the related revenue. At the end of the reporting period, the Company evaluates its deferred costs for their probable recoverability. The Company recognizes impairment of deferred costs when it is determined that the costs no no $0.2 September 30, 2019 December 31, 2018.

Note 4 - Balance Sheet Componen

Note 4 - Balance Sheet Components	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	4. Accounts receivable Account receivable includes amounts that are unbilled at the end of the period that are expected to be billed and collected within 12 $10.2 $22.2 September 30, 2019, December 31, 2018, not 12 $6.2 $5.3 September 30, 2019, December 31, 2018, Property and equipment Property and equipment, net consists of (in thousands): September 30, 2019 December 31, 2018 Property and equipment, net: Computer equipment $ 10,675 $ 10,536 Software 4,486 4,112 Furniture, fixtures and equipment 7,314 4,688 Leasehold improvements 6,045 5,474 Test equipment 22,250 14,697 Construction-in-progress 15,831 20,293 66,601 59,800 Less: accumulated depreciation and amortization (27,632 ) (24,119 ) Total $ 38,969 $ 35,681 Test equipment includes assets at customer sites that are contributing to solution revenues. The construction-in-progress balance as of September 30, 2019 December 31, 2018 three September 30, 2019 2018 $1.7 $1.2 nine September 30, 2019 2018 $4.3 $3.7 Goodwill and Intangible Assets As of September 30, 2019, December 31, 2018, $2.3 $1.9 Intangible assets balance was $6.5 $5.1 September 30, 2019, December 31, 2018, September 30, 2019, December 31, 2018 September 30, 2019 December 31, 2018 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 ‒ 9 $ 7,440 $ (4,823 ) $ 2,617 $ 6,740 $ (4,514 ) $ 2,226 Developed technology 4 ‒ 9 17,460 (13,912 ) 3,548 15,820 (13,404 ) 2,416 Tradename 2 ‒ 7 790 (667 ) 123 790 (648 ) 142 Patent 7 ‒ 10 1,800 (1,550 ) 250 1,800 (1,520 ) 280 Total $ 27,490 $ (20,952 ) $ 6,538 $ 25,150 $ (20,086 ) $ 5,064 The weighted average amortization period for acquired identifiable intangible assets was 6.4 September 30, 2019. three September 30, 2019 2018, $0.3 nine September 30, 2019 2018, $0.9 $0.8 Year ending December 31, Amount 2019 (remaining three months) $ 317 2020 1,269 2021 1,093 2022 886 2023 886 2024 and thereafter 2,087 Total future amortization expense $ 6,538 Intangible assets are amortized over their useful lives unless these lives are determined to be indefinite. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not three nine September 30, 2019, no

Note 5 - Leases

Note 5 - Leases	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	5. The Company leases administrative and sales offices and certain equipment under noncancelable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes, and utilities. These operating leases expire at various times through 2028. no September 30, 2019. Leases with an initial term of 12 not September 30, 2019. ROU assets represent the Company’s right to use an underlying asset for the lease term and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Effective January 1, 2019, not may Operating lease expense was $0.6 three September 30, 2019 2018. $1.7 $1.9 nine September 30, 2019 2018, Maturity of operating lease liabilities as of September 30, 2019, Year ending December 31, Amount (1) 2019 (remaining three months) $ 388 2020 1,842 2021 1,693 2022 1,510 2023 1,393 2024 and thereafter 4,750 Total future minimum lease payments $ 11,576 Less: Interest (2) (2,024 ) Present value of operating lease liabilities (3) $ 9,552 ( 1 As of September 30, 2019, $1.0 ( 2 Calculated using incremental borrowing interest rate for each lease. ( 3 Includes the current portion of operating lease liabilities of $1.8 September 30, 2019. As of September 30, 2019, 7.5 As of September 30, 2019, 5.3%. No three nine September 30, 2019.

Note 6 - Stockholders' Equity

Note 6 - Stockholders' Equity	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	6. Stock Repurchase Program On October 25, 2016, “2016 $25.0 two May 29, 2018, 2016 “2018 $25.0 two three nine September 30, 2019, 171,000 785,000 September 30, 2019, 785,000 $12.43 $9.8 2018 three nine September 30, 2018, zero 437,000 2016 no 2018 May 29, 2018, 1,279,000 $14.59 $18.7 2016 2018 September 30, 2019, $15.2

Note 7 - Employee Benefit Plans

Note 7 - Employee Benefit Plans	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	7. On September 30, 2019, Employee Stock Purchase Plan In July 2001, ten 10% 85% twenty-four four nine January 1 2002, 1 675,000 2 2% 3 May 18, 2010, May 17, 2020. The Company estimated the fair value of purchase rights granted under the Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values: Nine Months Ended September 30, 2019 2018 Expected life (in years) 1.25 1.25 Volatility 42.45 % 42.85 % Risk-free interest rate 2.24 % 2.48 % Expected dividend — — Weighted average fair value per share of options granted during the period $ 4.08 $ 3.62 During the three September 30, 2019 2018, 85,000 92,000 $8.90 $8.93 nine September 30, 2019 2018, 172,000 200,000 $8.92 $9.12 September 30, 2019, $0.9 1.4 September 30, 2019, 5.2 Stock Incentive Plans On November 16, 2011, 2011 “2011 2011 may 10,300,000 3,500,000 2001 2001 November 16, 2011. 2011 1.33 no ten four In 2001, 2001 “2001 2003, 2001 2001 2011. 2001 ten four no may 2001 2001 As of September 30, 2019, 10.8 2011 3.5 2011 0.5 2001 2011 September 30, 2019. September 30, 2019, no 2011, 2001, Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four . Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Cost of solutions $ 745 $ 787 $ 2,404 $ 2,768 Research and development 1,062 725 3,681 2,449 Selling, general and administrative 925 756 2,557 2,608 Stock-based compensation expenses $ 2,732 $ 2,268 $ 8,642 $ 7,825 The stock-based compensation expense in the table above includes immaterial expense or credit adjustments related to cash-settled stock appreciation rights (“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. Stock-based compensation capitalized in the capitalized software development costs included in the Property and Equipment, net, was approximately $0.2 September 30, 2019. Stock Options The Company estimated the fair value of each stock option granted under the 2011 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Expected life (in years) 4.46 4.43 4.46 4.43 Volatility 39.93 % 44.01 % 42.61 % 43.82 % Risk-free interest rate 1.40 % 2.73 % 1.99 % 2.71 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 4.70 $ 4.21 $ 4.61 $ 4.22 Additional information with respect to options under the Stock Plans during the nine September 30, 2019, 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 $4.61 per share) 66 $ 12.35 Exercised (217 ) $ 5.13 Canceled (75 ) $ 14.53 Expired (55 ) $ 16.09 Outstanding, September 30, 2019 746 $ 9.79 4.54 $ 2,521 Vested and expected to vest, September 30, 2019 732 $ 10.33 4.45 $ 2,502 Exercisable, September 30, 2019 582 $ 9.79 3.33 $ 2,291 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $13.07 September 30, 2019. nine September 30, 2019, $1.5 As of September 30, 2019, $0.7 2.8 nine September 30, 2019, $0.1 Restricted Stock Units The fair value and compensation cost before estimated forfeitures for restricted stock units is calculated using the closing price of common stock on the date of grant. Nonvested restricted stock units activity during the nine September 30, 2019, Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Nonvested, January 1, 2019 1,835 $ 11.93 Granted 895 $ 13.33 Vested (530 ) $ 13.40 Forfeited (164 ) $ 12.03 Nonvested, September 30, 2019 2,036 $ 12.17 As of September 30, 2019, $19.4 2.8 not

Note 8 - Restructuring Charges

Note 8 - Restructuring Charges	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Restructuring and Related Activities Disclosure [Text Block]	8. On September 27, 2018, October 24, 2018. From inception of the restructuring plan to September 30, 2019, $0.7 not The following table summarizes the activities of restructuring liabilities under this plan (in thousands): Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Beginning balance $ — $ 244 Restructuring charges — 92 Cash payments — (336 ) Ending balance $ — $ —

Note 9 - Income Taxes

Note 9 - Income Taxes	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	9. Income tax benefit increased $0.1 nine September 30, 2019, $1.5 $1.4 nine September 30, 2018. 26.2% 22.8% nine September 30, 2019 2018, nine September 30, 2019, 2018, The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of September 30, 2019, $13.5 $7.8 December 31, 2018, $13.3 $7.8 September 30, 2019, $2.8 $0.7 $11.4 $5.7 The valuation allowance was approximately $10.4 $9.8 September 30, 2019, December 31, 2018, not not Effective January 1, 2018, 2017 1 2 first 2018, The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state, and foreign jurisdictions. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open, statutes of limitation remain open for all tax years to the extent of the attributes carried forward into tax year 2002 not

Note 10 - Net Loss Per Share

Note 10 - Net Loss Per Share	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Earnings Per Share [Text Block]	10. Basic net loss per share is computed by dividing net loss by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net loss per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net loss per share (in thousands except per share amount): Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net loss $ (687 ) $ (2,082 ) $ (4,088 ) $ (4,602 ) Denominator: Basic weighted-average common shares outstanding 32,392 32,184 32,405 32,105 Effect of dilutive options and restricted stock — — — — Diluted weighted average shares outstanding 32,392 32,184 32,405 32,105 Net loss per share – Basic $ (0.02 ) $ (0.06 ) $ (0.13 ) $ (0.14 ) Net loss per share – Diluted $ (0.02 ) $ (0.06 ) $ (0.13 ) $ (0.14 ) For the three nine September 30, 2019 2018, The following table sets forth potential shares of common stock that are not Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Outstanding options 525 598 584 625 Nonvested restricted stock units 1,394 1,093 985 1,054 Employee Stock Purchase Plan 53 465 150 165 Total 1,972 2,156 1,719 1,844

Note 11 - Customer and Geograph

Note 11 - Customer and Geographic Information	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	11. 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 and assessing financial performance. Accordingly, the Company considers itself to be in one The Company had revenues from individual customers in excess of 10% Three Months Ended September 30, Nine Months Ended September 30, Customer 2019 2018 2019 2018 A 22 % 38 % 30 % 39 % B 16 % * % * % * % * represents less than 10% The Company had gross accounts receivable from individual customers in excess of 10% Customer September 30, 2019 December 31, 2018 A 30 % 35 % B 14 % 21 % C 11 % * % * represents less than 10% Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands): Three Months Ended September 30, 2019 2018 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 7,341 34 % $ 8,366 41 % China 5,118 23 4,644 23 Japan 2,423 11 1,652 8 Taiwan 1,945 9 936 5 Rest of the world 5,087 23 4,615 23 Total revenue $ 21,914 100 % $ 20,213 100 % Nine Months Ended September 30, 2019 2018 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 25,203 40 % $ 27,430 42 % China 11,369 18 14,186 21 Taiwan 6,041 10 4,109 6 Japan 4,761 7 4,193 7 Rest of the world 15,649 25 16,151 24 Total revenue $ 63,023 100 % $ 66,069 100 % Long-lived assets, net by geographic area are as follows (in thousands): September 30, 2019 (1) December 31, 2018 (2) United States $ 44,370 $ 35,173 Rest of the world 2,180 508 Total long-lived assets, net $ 46,550 $ 35,681 ( 1 Amounts consist of property and equipment, net, and operating lease right-of-use assets, net ( 2 Amounts consist of property and equipment, net

Note 12 - Fair Value Measuremen

Note 12 - Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	12. Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three Level 1 Inputs are quoted prices in active markets for identical assets or liabilities. Level 2 Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not Level 3 Inputs are derived from valuation techniques in which one The following table represents the Company’s assets measured at fair value on a recurring basis as of September 30, 2019, Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 27,524 $ 27,524 $ — $ — The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2018, Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 27,068 $ 27,068 $ — $ — The Company enters into foreign currency forward contracts from time to time to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities, primarily on third not not Therefore, the change in fair value of these contracts is recorded into earnings as a component of other income (expense), net, and offsets the change in fair value of the foreign currency denominated assets and liabilities, which is also recorded in other income (expense), net. For the three September 30, 2019 2018, $0.4 $0.1 nine September 30, 2019 2018, $0.7 $0.5 The Company carries these derivatives financial instruments on its condensed consolidated balance sheets at their fair values. The Company’s foreign currency forward contracts are classified as Level 2 not September 30, 2019, no December 31, 2018, one $8.2 $55,000

Note 13 - Commitments and Conti

Note 13 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	13. Indemnifications 90 third not Purchase obligations September 30, 2019, $14.9 12 Indemnification of Officers and Directors In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may may not Litigation September 30, 2019, not no no

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10 10 X. not may 10 December 31, 2018. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2018, not
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with 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, impairment of goodwill and long-lived assets, accounting for stock-based compensation expense, and income taxes. Actual results could differ from those estimates.
Reclassification, Policy [Policy Text Block]	Reclassification of Prior Period Amount Certain prior period amounts have been reclassified to conform to current year presentation of reporting amortization of costs capitalized to obtain revenue contracts on the Condensed Consolidated Statements of Cash Flows. This reclassification had no
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards Leases In February 2016, 2016 02, 842 2017 13, 2018 10, 2018 11, 2018 20 2019 01 842 842 12 842 December 15, 2018, not 842 January 1, 2019 not In addition, the Company elected the transition package of three not not 12 no The Company’s lease portfolio consists primarily of real estate assets, which include administrative and sales offices, and its research and development laboratory and clean room. Some of these leases also require the Company to pay maintenance, utilities, taxes, insurance, and other operating expenses associated with the leased space. Based upon the nature of the items leased and the structure of the leases, the Company’s leases are classified as operating leases and continue to be classified as operating leases under the new accounting standard. As a result of the adoption of the new lease accounting guidance, the Company recognized on January 1, 2019: ● operating lease liabilities of approximately $10.5 5.3%, ● operating lease ROU assets of approximately $8.7 $10.5 1 $0.3 2 $1.5 The adoption of the new lease accounting standard did not not 5 Income Statement – Reporting Comprehensive Income (Loss) In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 January 1, 2019, not Compensation - Stock Compensation In June 2018, 2018 07, 718 718, January 1, 2019, not FASB U pdates C ertain SEC G uidance in the Codification In July 2019, No. 2019 07, No. 33 10532, 33 10231 33 10442, July 2019. third 2019, not first 2019. Management has reviewed other recently issued accounting pronouncements and has determined there are not Accounting Standards Not In June 2016, 2016 13, 326 2016 13 2018 19, 326, 2019 04, 326, 815, 825, 2019 05, 326 326 326 326 first 2020. not In January 2017, No. 2017 04, 350 2 December 15, 2019, not In August 2018, No. 2018 15, 350 40 first 2020. No. 2018 15 not

Note 2 - Business Combination (

Note 2 - Business Combination (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	(in thousands) Amortization period (years) Finite-lived intangible assets: Developed technology $ 1,640 9 Customer relationship 700 9 Deferred revenue (50 ) Net asset acquired $ 2,290 Goodwill 370 Purchase consideration $ 2,660

Note 3 - Revenue From Contrac_2

Note 3 - Revenue From Contracts With Customers (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Licenses and Gainshare Performance Incentives $ 6,454 $ 7,729 $ 20,360 $ 22,044 Support and Services 15,267 11,905 42,298 43,095 Other 193 579 365 930 Total $ 21,914 $ 20,213 $ 63,023 $ 66,069 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Over time 70 % 59 % 67 % 66 % Point-in-time 30 % 41 % 33 % 34 % Total 100 % 100 % 100 % 100 %

Note 4 - Balance Sheet Compon_2

Note 4 - Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	September 30, 2019 December 31, 2018 Property and equipment, net: Computer equipment $ 10,675 $ 10,536 Software 4,486 4,112 Furniture, fixtures and equipment 7,314 4,688 Leasehold improvements 6,045 5,474 Test equipment 22,250 14,697 Construction-in-progress 15,831 20,293 66,601 59,800 Less: accumulated depreciation and amortization (27,632 ) (24,119 ) Total $ 38,969 $ 35,681
Schedule of Finite-Lived Intangible Assets [Table Text Block]	September 30, 2019 December 31, 2018 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 ‒ 9 $ 7,440 $ (4,823 ) $ 2,617 $ 6,740 $ (4,514 ) $ 2,226 Developed technology 4 ‒ 9 17,460 (13,912 ) 3,548 15,820 (13,404 ) 2,416 Tradename 2 ‒ 7 790 (667 ) 123 790 (648 ) 142 Patent 7 ‒ 10 1,800 (1,550 ) 250 1,800 (1,520 ) 280 Total $ 27,490 $ (20,952 ) $ 6,538 $ 25,150 $ (20,086 ) $ 5,064
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, Amount 2019 (remaining three months) $ 317 2020 1,269 2021 1,093 2022 886 2023 886 2024 and thereafter 2,087 Total future amortization expense $ 6,538

Note 5 - Leases (Tables)

Note 5 - Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year ending December 31, Amount (1) 2019 (remaining three months) $ 388 2020 1,842 2021 1,693 2022 1,510 2023 1,393 2024 and thereafter 4,750 Total future minimum lease payments $ 11,576 Less: Interest (2) (2,024 ) Present value of operating lease liabilities (3) $ 9,552

Note 7 - Employee Benefit Pla_2

Note 7 - Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Nine Months Ended September 30, 2019 2018 Expected life (in years) 1.25 1.25 Volatility 42.45 % 42.85 % Risk-free interest rate 2.24 % 2.48 % Expected dividend — — Weighted average fair value per share of options granted during the period $ 4.08 $ 3.62 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Expected life (in years) 4.46 4.43 4.46 4.43 Volatility 39.93 % 44.01 % 42.61 % 43.82 % Risk-free interest rate 1.40 % 2.73 % 1.99 % 2.71 % Expected dividend — — — — Weighted average fair value per share of options granted during the period $ 4.70 $ 4.21 $ 4.61 $ 4.22
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Cost of solutions $ 745 $ 787 $ 2,404 $ 2,768 Research and development 1,062 725 3,681 2,449 Selling, general and administrative 925 756 2,557 2,608 Stock-based compensation expenses $ 2,732 $ 2,268 $ 8,642 $ 7,825
Share-based Payment Arrangement, Option, Activity [Table Text Block]	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 $4.61 per share) 66 $ 12.35 Exercised (217 ) $ 5.13 Canceled (75 ) $ 14.53 Expired (55 ) $ 16.09 Outstanding, September 30, 2019 746 $ 9.79 4.54 $ 2,521 Vested and expected to vest, September 30, 2019 732 $ 10.33 4.45 $ 2,502 Exercisable, September 30, 2019 582 $ 9.79 3.33 $ 2,291
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Nonvested, January 1, 2019 1,835 $ 11.93 Granted 895 $ 13.33 Vested (530 ) $ 13.40 Forfeited (164 ) $ 12.03 Nonvested, September 30, 2019 2,036 $ 12.17

Note 8 - Restructuring Charges

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

Note 10 - Net Loss Per Share (T

Note 10 - Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net loss $ (687 ) $ (2,082 ) $ (4,088 ) $ (4,602 ) Denominator: Basic weighted-average common shares outstanding 32,392 32,184 32,405 32,105 Effect of dilutive options and restricted stock — — — — Diluted weighted average shares outstanding 32,392 32,184 32,405 32,105 Net loss per share – Basic $ (0.02 ) $ (0.06 ) $ (0.13 ) $ (0.14 ) Net loss per share – Diluted $ (0.02 ) $ (0.06 ) $ (0.13 ) $ (0.14 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Outstanding options 525 598 584 625 Nonvested restricted stock units 1,394 1,093 985 1,054 Employee Stock Purchase Plan 53 465 150 165 Total 1,972 2,156 1,719 1,844

Note 11 - Customer and Geogra_2

Note 11 - Customer and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2019
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, Customer 2019 2018 2019 2018 A 22 % 38 % 30 % 39 % B 16 % * % * % * %
Receivables by Major Customers [Table Text Block]	Customer September 30, 2019 December 31, 2018 A 30 % 35 % B 14 % 21 % C 11 % * %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Three Months Ended September 30, 2019 2018 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 7,341 34 % $ 8,366 41 % China 5,118 23 4,644 23 Japan 2,423 11 1,652 8 Taiwan 1,945 9 936 5 Rest of the world 5,087 23 4,615 23 Total revenue $ 21,914 100 % $ 20,213 100 % Nine Months Ended September 30, 2019 2018 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 25,203 40 % $ 27,430 42 % China 11,369 18 14,186 21 Taiwan 6,041 10 4,109 6 Japan 4,761 7 4,193 7 Rest of the world 15,649 25 16,151 24 Total revenue $ 63,023 100 % $ 66,069 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	September 30, 2019 (1) December 31, 2018 (2) United States $ 44,370 $ 35,173 Rest of the world 2,180 508 Total long-lived assets, net $ 46,550 $ 35,681

Note 12 - Fair Value Measurem_2

Note 12 - Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
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) Money market mutual funds $ 27,524 $ 27,524 $ — $ — Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 27,068 $ 27,068 $ — $ —

Note 1 - Basis of Presentatio_2

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Liability, Total	[1],[2]	$ 9,552
Operating Lease, Weighted Average Discount Rate, Percent		5.30%
Operating Lease, Right-of-Use Asset		$ 7,581
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 10,500
Operating Lease, Weighted Average Discount Rate, Percent			5.30%
Operating Lease, Right-of-Use Asset			$ 8,700
Deferred Rent Credit			300
Incentive to Lessee			$ 1,500
[1]	As of September 30, 2019, 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]	Includes the current portion of operating lease liabilities of $1.8 million as of September 30, 2019.

Note 2 - Business Combination_2

Note 2 - Business Combination (Details Textual) - USD ($)	Apr. 29, 2019	Sep. 30, 2019	Sep. 30, 2018
Payments to Acquire Businesses, Gross	$ 2,660,000	$ 2,660,000
Acquisition of StreamMosaic, Inc. [Member]
Payments to Acquire Businesses, Gross	2,700,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 370,000

Note 2 - Business Combination -

Note 2 - Business Combination - Fair Values of Assets Acquired and Liabilities Assumed and the Related Useful Lives (Details) - USD ($) $ in Thousands	Apr. 29, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Deferred revenue	$ (50)
Net asset acquired	2,290
Goodwill, Ending Balance	370	$ 2,293		$ 1,923
Purchase consideration	2,660	$ 2,660
Developed Technology Rights [Member]
Finite-lived intangible assets	$ 1,640
Finite-lived intangible assets, amortization period (Year)	9 years
Customer Relationships [Member]
Finite-lived intangible assets	$ 700
Finite-lived intangible assets, amortization period (Year)	9 years

Note 3 - Revenue From Contrac_3

Note 3 - Revenue From Contracts With Customers 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Contract with Customer, Liability, Noncurrent	$ 2,400		$ 2,400		$ 1,000
Contract with Customer, Liability, Revenue Recognized		$ 4,400	13,000	$ 12,000
Revenue, Remaining Performance Obligation, Amount	35,500		35,500
Contract with Customer, Performance Obligation Satisfied in Previous Period	300	1,300	100	1,600
Capitalized Contract Cost, Net, Total	700		700		500
Capitalized Contract Cost, Amortization	100	100	344	278
Capitalized Contract Cost, Impairment Loss	0	$ 0	0	$ 0
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net, Current, Total	3,000		3,000		2,700
Prepaid Expenses and Other Current Assets and Other Non-current Assets [Member]
Deferred Costs, Total	$ 200		$ 200		$ 200
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Countries other than the United States [Member]
Concentration Risk, Percentage	66.00%	59.00%	60.00%	58.00%

Note 3 - Revenue From Contrac_4

Note 3 - Revenue From Contracts With Customers 2 (Details Textual) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01	Sep. 30, 2019
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	5 years

Note 3 - Revenue From Contrac_5

Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 21,914	$ 20,213	$ 63,023	$ 66,069
Percent of revenue	100.00%	100.00%	100.00%	100.00%
Transferred over Time [Member]
Percent of revenue	70.00%	59.00%	67.00%	66.00%
Transferred at Point in Time [Member]
Percent of revenue	30.00%	41.00%	33.00%	34.00%
License [Member]
Revenues	$ 6,454	$ 7,729	$ 20,360	$ 22,044
Service [Member]
Revenues	15,267	11,905	42,298	43,095
Product and Service, Other [Member]
Revenues	$ 193	$ 579	$ 365	$ 930

Note 4 - Balance Sheet Compon_3

Note 4 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Apr. 29, 2019	Dec. 31, 2018
Unbilled Receivables, Current	$ 10,200		$ 10,200			$ 22,200
Unbilled Receivables, Not Expected to be Billed and Collected in Next Twelve Months	6,200		6,200			5,300
Depreciation, Depletion and Amortization, Nonproduction, Total	1,700	$ 1,200	4,300	$ 3,700
Goodwill, Ending Balance	2,293		2,293		$ 370	1,923
Finite-Lived Intangible Assets, Net, Ending Balance	6,538		$ 6,538			$ 5,064
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 146 days
Amortization of Intangible Assets, Total	300		$ 867	$ 757
Impairment of Intangible Assets, Finite-lived	$ 0

Note 4 - Balance Sheet Compon_4

Note 4 - Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property and equipment, gross	$ 66,601	$ 59,800
Less: accumulated depreciation and amortization	(27,632)	(24,119)
Total	38,969	35,681
Computer Equipment [Member]
Property and equipment, gross	10,675	10,536
Software and Software Development Costs [Member]
Property and equipment, gross	4,486	4,112
Furniture and Fixtures [Member]
Property and equipment, gross	7,314	4,688
Leasehold Improvements [Member]
Property and equipment, gross	6,045	5,474
Test Equipment [Member]
Property and equipment, gross	22,250	14,697
Construction in Progress [Member]
Property and equipment, gross	$ 15,831	$ 20,293

Note 4 - Balance Sheet Compon_5

Note 4 - Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Gross Carrying Amount	$ 27,490	$ 25,150
Accumulated Amortization	(20,952)	(20,086)
Intangible assets, net	6,538	5,064
Customer Relationships [Member]
Gross Carrying Amount	7,440	6,740
Accumulated Amortization	(4,823)	(4,514)
Intangible assets, net	$ 2,617	2,226
Customer Relationships [Member] | Minimum [Member]
Amortization Period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 17,460	15,820
Accumulated Amortization	(13,912)	(13,404)
Intangible assets, net	$ 3,548	2,416
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Trade Names [Member]
Gross Carrying Amount	$ 790	790
Accumulated Amortization	(667)	(648)
Intangible assets, net	$ 123	142
Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	7 years
Patents [Member]
Gross Carrying Amount	$ 1,800	1,800
Accumulated Amortization	(1,550)	(1,520)
Intangible assets, net	$ 250	$ 280
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years

Note 4 - Balance Sheet Compon_6

Note 4 - Balance Sheet Components - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
2019 (remaining three months)	$ 317
2020	1,269
2021	1,093
2022	886
2023	886
2024 and thereafter	2,087
Total future amortization expense	$ 6,538	$ 5,064

Note 5 - Leases (Details Textua

Note 5 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lease, Cost, Total	$ 600	$ 600	$ 1,700	$ 1,900
Operating Lease Liability, Renewal Period	1,000		1,000
Operating Lease, Liability, Current	$ 1,826		$ 1,826
Operating Lease, Weighted Average Remaining Lease Term	7 years 182 days		7 years 182 days
Operating Lease, Weighted Average Discount Rate, Percent	5.30%		5.30%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0		$ 0

Note 5 - Leases - Maturity of O

Note 5 - Leases - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)	[1]
2019 (remaining three months)	$ 388
2020	1,842
2021	1,693
2022	1,510
2023	1,393
2024 and thereafter	4,750
Total future minimum lease payments	11,576
Less: Interest(2)	(2,024)	[2]
Present value of operating lease liabilities(3)	$ 9,552	[3]
[1]	As of September 30, 2019, 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 $1.8 million as of September 30, 2019.

Note 6 - Stockholders' Equity (

Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	May 29, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Oct. 25, 2016
Treasury Stock, Value, Acquired, Cost Method		$ 2,060	$ 3,790	$ 3,917		$ 1,125	$ 4,123
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 15,200						$ 15,200		$ 15,200
The 2016 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount											$ 25,000
Treasury Stock, Shares, Acquired					437,000				437,000	1,279,000
Treasury Stock Acquired, Average Cost Per Share										$ 14.59
Treasury Stock, Value, Acquired, Cost Method										$ 18,700
The 2018 Stock Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount	$ 25,000
Stock Repurchase Program, Period in Force	2 years
Treasury Stock, Shares, Acquired		171,000			0			785,000		785,000
Treasury Stock Acquired, Average Cost Per Share										$ 12.43
Treasury Stock, Value, Acquired, Cost Method										$ 9,800
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 0						$ 0		$ 0

Note 7 - Employee Benefit Pla_3

Note 7 - Employee Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2001	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period				75,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		746,000		746,000		1,027,000
Share-based Payment Arrangement, Amount Capitalized				$ 244
Share Price		$ 13.07		$ 13.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 1,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				100
Software Development [Member]
Share-based Payment Arrangement, Amount Capitalized				200
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 700		$ 700
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				2 years 292 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 19,400		$ 19,400
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				2 years 292 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	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	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		85,000	92,000	172,000	200,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased		$ 8.90	$ 8.93	$ 8.92	$ 9.12
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 900		$ 900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 146 days
Number Of ESPP Shares Available For Future Issuance		5,200,000		5,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		0		0
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		10,300,000		10,300,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate				1.33
Common Stock, Capital Shares Reserved for Future Issuance		10,800,000		10,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		3,500,000		3,500,000
Twenty Eleven Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized							3,500,000
IDS Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period				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		0		0

Note 7 - Employee Benefit Pla_4

Note 7 - Employee Benefit Plans - Stock Options, Valuation Assumptions (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Weighted average fair value (in dollars per share)			$ 4.61
Stock Plans [Member]
Expected life (Year)			1 year 91 days	1 year 91 days
Volatility			42.45%	42.85%
Risk-free interest rate			2.24%	2.48%
Expected dividend			0.00%	0.00%
Weighted average fair value (in dollars per share)			$ 4.08	$ 3.62
Twenty Eleven Stock Incentive Plan [Member]
Expected life (Year)	4 years 167 days	4 years 156 days	4 years 167 days	4 years 156 days
Volatility	39.93%	44.01%	42.61%	43.82%
Risk-free interest rate	1.40%	2.73%	1.99%	2.71%
Expected dividend			0.00%	0.00%
Weighted average fair value (in dollars per share)	$ 4.70	$ 4.21	$ 4.61	$ 4.22

Note 7 - Employee Benefit Pla_5

Note 7 - Employee Benefit Plans - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allocation of recognized period costs	$ 2,732	$ 2,268	$ 8,642	$ 7,825
Cost of Sales [Member]
Allocation of recognized period costs	745	787	2,404	2,768
Research and Development Expense [Member]
Allocation of recognized period costs	1,062	725	3,681	2,449
Selling, General and Administrative Expenses [Member]
Allocation of recognized period costs	$ 925	$ 756	$ 2,557	$ 2,608

Note 7 - Employee Benefit Pla_6

Note 7 - Employee Benefit Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019
Outstanding (in shares)	1,027
Outstanding, weighted average exercise price (in dollars per share)	$ 9.75
Granted (in shares)	66
Exercised (in shares)	(217)
Exercised, weighted average exercise price (in dollars per share)	$ 5.13
Canceled (in shares)	(75)
Canceled, weighted average exercise price (in dollars per share)	$ 14.53
Expired (in shares)	(55)
Expired, weighted average exercise price (in dollars per share)	$ 16.09
Outstanding (in shares)	746
Outstanding, weighted average exercise price (in dollars per share)	$ 9.79
Outstanding, weighted average remaining contractual term (Year)	4 years 197 days
Outstanding, aggregate intrinsic value	$ 2,521
Vested and expected to vest (in shares)	732
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.33
Vested and expected to vest, weighted average remaining contractual term (Year)	4 years 164 days
Vested and expected to vest, aggregate intrinsic value	$ 2,502
Exercisable (in shares)	582
Exercisable, weighted average exercise price (in dollars per share)	$ 9.79
Exercisable, weighted average remaining contractual term (Year)	3 years 120 days
Exercisable, aggregate intrinsic value	$ 2,291

Note 7 - Employee Benefit Pla_7

Note 7 - Employee Benefit Plans - Stock Options Activity (Details) (Parentheticals)	9 Months Ended
	Sep. 30, 2019$ / shares
Weighted average fair value (in dollars per share)	$ 4.61

Note 7 - Employee Benefit Pla_8

Note 7 - Employee Benefit Plans - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Nonvested, Balance (in shares) | shares	1,835
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 11.93
Granted (in shares) | shares	895
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.33
Vested (in shares) | shares	(530)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.40
Forfeited (in shares) | shares	(164)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.03
Nonvested, Balance (in shares) | shares	2,036
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 12.17

Note 8 - Restructuring Charge_2

Note 8 - Restructuring Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Charges, Total			$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Restructuring Charges, Total			92
Reduction in Its Workforce to Reduce Expenses [Member] | Employee Severance [Member]
Restructuring Charges, Total			$ 700

Note 8 - Restructuring Charge_3

Note 8 - Restructuring Charges - Restructuring Liability Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring charges			$ 92
Reduction in Its Workforce to Reduce Expenses [Member]
Beginning balance			244
Restructuring charges			92
Cash payments			(336)
Ending balance

Note 9 - Income Taxes (Details

Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Increase (Decrease) in Income Taxes			$ 100
Income Tax Expense (Benefit), Total	$ (511)	$ (535)	$ (1,458)	$ (1,355)
Effective Income Tax Rate Reconciliation, Percent, Total			26.20%	22.80%
Unrecognized Tax Benefits, Ending Balance	13,500		$ 13,500		$ 13,300
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,800		7,800		7,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	2,800		2,800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued in Long Term Liabilities	700		700
Unrecognized Tax Benefits In Deferred Tax Assets	11,400		11,400
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	5,700		5,700
Deferred Tax Assets, Valuation Allowance, Total	$ 10,400		$ 10,400		$ 9,800

Note 10 - Net Loss Per Share -

Note 10 - Net Loss Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net loss	$ (687)	$ (2,082)	$ (4,088)	$ (4,602)
Basic weighted-average common shares outstanding (in shares)	32,392	32,184	32,405	32,105
Effect of dilutive options and restricted stock (in shares)
Diluted weighted average shares outstanding (in shares)	32,392	32,184	32,405	32,105
Basic (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)
Diluted (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)

Note 10 - Net Loss Per Share _2

Note 10 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Anti-dilutive securities (in shares)	1,972	2,156	1,719	1,844
Share-based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	525	598	584	625
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)	1,394	1,093	985	1,054
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)	53	465	150	165

Note 11 - Customer and Geogra_3

Note 11 - Customer and Geographic Information (Details Textual)	9 Months Ended
	Sep. 30, 2019
Number of Operating Segments	1

Note 11 - Customer and Geogra_4

Note 11 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Customer A [Member]
Receivables percentage by major customer	22.00%	38.00%		30.00%		39.00%
Customer B [Member]
Receivables percentage by major customer	16.00%		[1]		[1]		[1]
[1]	represents less than 10%

Note 11 - Customer and Geogra_5

Note 11 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Customer A [Member]
Receivables percentage by major customer	30.00%	35.00%
Customer B [Member]
Receivables percentage by major customer	14.00%	21.00%
Customer C [Member]
Receivables percentage by major customer	11.00%		[1]
[1]	represents less than 10%

Note 11 - Customer and Geogra_6

Note 11 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 21,914	$ 20,213	$ 63,023	$ 66,069
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Revenues	$ 21,914	$ 20,213	$ 63,023	$ 66,069
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Revenues	$ 7,341	$ 8,366	$ 25,203	$ 27,430
Concentration Risk, Percentage	34.00%	41.00%	40.00%	42.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | CHINA
Revenues	$ 5,118	$ 4,644	$ 11,369	$ 14,186
Concentration Risk, Percentage	23.00%	23.00%	18.00%	21.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | JAPAN
Revenues	$ 2,423	$ 1,652	$ 4,761	$ 4,193
Concentration Risk, Percentage	11.00%	8.00%	7.00%	7.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | TAIWAN, PROVINCE OF CHINA
Revenues	$ 1,945	$ 936	$ 6,041	$ 4,109
Concentration Risk, Percentage	9.00%	5.00%	10.00%	6.00%
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Rest of the World [Member]
Revenues	$ 5,087	$ 4,615	$ 15,649	$ 16,151
Concentration Risk, Percentage	23.00%	23.00%	25.00%	24.00%

Note 11 - Customer and Geogra_7

Note 11 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2019	[1]	Dec. 31, 2018	[2]
Long-lived assets	$ 46,550		$ 35,681
UNITED STATES
Long-lived assets	44,370		35,173
Rest of the World [Member]
Long-lived assets	$ 2,180		$ 508
[1]	Amounts consist of property and equipment, net, and operating lease right-of-use assets, net
[2]	Amounts consist of property and equipment, net

Note 12 - Fair Value Measurem_3

Note 12 - Fair Value Measurements (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative Asset, Notional Amount					$ 8,200,000
Other Current Liabilities [Member]
Derivative Asset, Current					$ 55,000
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ (400,000)	$ (100,000)	$ (700,000)	$ (500,000)

Note 12 - Fair Value Measurem_4

Note 12 - Fair Value Measurements - Fair Value, Assets Measured on a Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Money market mutual funds	$ 27,524	$ 27,068
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	27,524	27,068
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds

Note 13 - Commitments and Con_2

Note 13 - Commitments and Contingencies (Details Textual) $ in Thousands	Sep. 30, 2019USD ($)
Purchase Obligation, Due in Next Twelve Months	$ 14,900
Loss Contingency Accrual, Ending Balance	$ 0