Qualys (QLYS) 10-Q 9 Aug 21 2021 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 03, 2021
Document Information [Line Items]
Entity Central Index Key	0001107843
Entity Registrant Name	QUALYS, INC.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-35662
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0534145
Entity Address, Address Line One	919 E. Hillsdale Boulevard, 4th Floor
Entity Address, City or Town	Foster City
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94404
City Area Code	650
Local Phone Number	801-6100
Title of 12(b) Security	Common stock, $0.001 par value per share
Trading Symbol	QLYS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,944,931

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 97,278	$ 74,132
Short-term marketable securities	262,941	281,892
Accounts receivable, net of allowance of $713 and $725 as of June 30, 2021 and December 31, 2020, respectively	86,044	100,179
Prepaid expenses and other current assets	21,979	19,142
Total current assets	468,242	475,345
Long-term marketable securities	110,890	98,458
Property and equipment, net	65,959	64,850
Operating leases - right of use asset	40,403	44,838
Deferred tax assets, net	16,469	15,811
Intangible assets, net	8,715	12,006
Goodwill	7,447	7,447
Restricted cash	1,200	1,200
Other noncurrent assets	17,980	16,864
Total assets	737,305	736,819
Current liabilities:
Accounts payable	1,597	731
Accrued liabilities	30,685	29,833
Deferred revenues, current	228,180	213,494
Operating lease liabilities, current	12,246	11,672
Total current liabilities	272,708	255,730
Deferred revenues, noncurrent	28,681	30,540
Operating lease liabilities, noncurrent	40,422	45,700
Other noncurrent liabilities	2,499	367
Total liabilities	344,310	332,337
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.001 par value; 20,000 shares authorized, no shares issued and outstanding at June 30, 2021 and December 31, 2020	0	0
Common stock, $0.001 par value; 1,000,000 shares authorized; 38,995 and 39,253 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	39	39
Additional paid-in capital	424,507	401,359
Accumulated other comprehensive loss	(265)	(484)
Retained earnings (accumulated deficit)	(31,286)	3,568
Total stockholders’ equity	392,995	404,482
Total liabilities and stockholders’ equity	$ 737,305	$ 736,819

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts receivable	$ 713	$ 725
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	20,000	20,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par or stated value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	38,995	39,253
Common stock, shares outstanding (in shares)	38,995	39,253

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 99,702	$ 88,830	$ 196,458	$ 175,093
Cost of revenues	21,552	18,891	43,232	37,386
Gross profit	78,150	69,939	153,226	137,707
Operating expenses:
Research and development	19,805	18,058	37,554	36,041
Sales and marketing	17,770	15,783	35,759	34,013
General and administrative	11,213	10,590	53,256	21,714
Total operating expenses	48,788	44,431	126,569	91,768
Income from operations	29,362	25,508	26,657	45,939
Other income (expense), net:
Interest expense	0	0	(4)	(3)
Interest income	567	1,392	1,313	3,316
Other income (expense), net	(80)	194	(324)	59
Total other income, net	487	1,586	985	3,372
Income before income taxes	29,849	27,094	27,642	49,311
Income tax provision	8,707	775	6,272	4,298
Net income	$ 21,142	$ 26,319	$ 21,370	$ 45,013
Net income per share:
Basic (in dollars per share)	$ 0.54	$ 0.67	$ 0.55	$ 1.15
Diluted (in dollars per share)	$ 0.53	$ 0.64	$ 0.53	$ 1.10
Weighted average shares used in computing net income per share:
Basic (in shares)	39,099	39,161	39,154	39,137
Diluted (in shares)	40,077	40,919	40,253	40,883

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income	$ 21,142	$ 26,319	$ 21,370	$ 45,013
Other comprehensive income (loss), net of tax:
Net change in unrealized gains (losses) on available-for-sale debt securities, net of tax	(202)	1,078	(591)	1,344
Net change in unrealized gains (losses) on cash flow hedges, net of tax	(183)	(196)	810	(71)
Other comprehensive income (loss), net of tax	(385)	882	219	1,273
Comprehensive income	$ 20,757	$ 27,201	$ 21,589	$ 46,286

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flow from operating activities:
Net income	$ 21,370	$ 45,013
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	17,869	15,633
Bad debt expense	152	299
Loss on disposal of property and equipment	12	0
Stock-based compensation	46,755	19,441
Amortization of premiums (accretion of discounts) on marketable securities	2,029	(21)
Deferred income taxes	(722)	1,269
Changes in operating assets and liabilities:
Accounts receivable	13,983	1,797
Prepaid expenses and other assets	(6,014)	(6,725)
Accounts payable	947	220
Accrued liabilities	3,032	(972)
Deferred revenues	12,827	5,695
Net cash provided by operating activities	112,240	81,649
Cash flow from investing activities:
Purchases of marketable securities	(201,411)	(162,912)
Sales and maturities of marketable securities	205,143	164,109
Purchases of property and equipment	(12,911)	(11,568)
Proceeds from disposal of property and equipment	6	0
Net cash used in investing activities	(9,173)	(10,371)
Cash flow from financing activities:
Repurchases of common stock	(63,252)	(54,182)
Proceeds from exercise of stock options	4,438	20,430
Payments for taxes related to net share settlement of equity awards	(21,017)	(11,115)
Principal payments under finance lease obligations	(90)	(61)
Net cash used in financing activities	(79,921)	(44,928)
Net increase in cash, cash equivalents and restricted cash	23,146	26,350
Cash, cash equivalents and restricted cash at beginning of period	75,332	88,759
Cash, cash equivalents and restricted cash at end of period	$ 98,478	$ 115,109

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balances (in shares) at Dec. 31, 2019	39,146
Balance at Dec. 31, 2019	$ 39	$ 362,408	$ 1,162	$ 23,194	$ 386,803
Net income	0	0	0	18,694	18,694
Other comprehensive income (loss), net of tax	$ 0	0	391	0	391
Issuance of common stock upon exercise of stock options (in shares)	145
Issuance of common stock upon exercise of stock options	$ 0	4,714	0	0	4,714
Repurchase of common stock (in shares)	(346)
Repurchase of common stock	$ 0	(4,160)	0	(24,766)	(28,926)
Issuance of common stock upon vesting of restricted stock units (in shares)	138
Issuance of common stock upon vesting of restricted stock units	$ 0	0	0	0	0
Taxes related to net share settlement of equity awards (in shares)	(58)
Taxes related to net share settlement of equity awards	$ 0	(5,000)	0	0	(5,000)
Stock-based compensation	$ 0	10,054	0	0	10,054
Balances (in shares) at Mar. 31, 2020	39,025
Balance at Mar. 31, 2020	$ 39	368,016	1,553	17,122	386,730
Balances (in shares) at Dec. 31, 2019	39,146
Balance at Dec. 31, 2019	$ 39	362,408	1,162	23,194	386,803
Net income					45,013
Other comprehensive income (loss), net of tax					1,273
Balances (in shares) at Jun. 30, 2020	39,315
Balance at Jun. 30, 2020	$ 39	384,202	2,435	21,098	407,774
Balances (in shares) at Mar. 31, 2020	39,025
Balance at Mar. 31, 2020	$ 39	368,016	1,553	17,122	386,730
Net income	0	0	0	26,319	26,319
Other comprehensive income (loss), net of tax	$ 0	0	882	0	882
Issuance of common stock upon exercise of stock options (in shares)	448
Issuance of common stock upon exercise of stock options	$ 1	15,715	0	0	15,716
Repurchase of common stock (in shares)	(243)
Repurchase of common stock	$ (1)	(2,912)	0	(22,343)	(25,256)
Issuance of common stock upon vesting of restricted stock units (in shares)	146
Issuance of common stock upon vesting of restricted stock units	$ 0	0	0	0	0
Taxes related to net share settlement of equity awards (in shares)	(61)
Taxes related to net share settlement of equity awards	$ 0	(6,115)	0	0	(6,115)
Stock-based compensation	$ 0	9,498	0	0	9,498
Balances (in shares) at Jun. 30, 2020	39,315
Balance at Jun. 30, 2020	$ 39	384,202	2,435	21,098	407,774
Balances (in shares) at Dec. 31, 2020	39,253
Balance at Dec. 31, 2020	$ 39	401,359	(484)	3,568	404,482
Net income	0	0	0	228	228
Other comprehensive income (loss), net of tax	$ 0	0	604	0	604
Issuance of common stock upon exercise of stock options (in shares)	69
Issuance of common stock upon exercise of stock options	$ 0	2,264	0	0	2,264
Repurchase of common stock (in shares)	(269)
Repurchase of common stock	$ 0	(3,232)	0	(27,797)	(31,029)
Issuance of common stock upon vesting of restricted stock units (in shares)	305
Issuance of common stock upon vesting of restricted stock units	$ 0	0	0	0	0
Taxes related to net share settlement of equity awards (in shares)	(155)
Taxes related to net share settlement of equity awards	$ 0	(17,643)	0	0	(17,643)
Stock-based compensation	$ 0	38,202	0	0	38,202
Balances (in shares) at Mar. 31, 2021	39,203
Balance at Mar. 31, 2021	$ 39	420,950	120	(24,001)	397,108
Balances (in shares) at Dec. 31, 2020	39,253
Balance at Dec. 31, 2020	$ 39	401,359	(484)	3,568	404,482
Net income					21,370
Other comprehensive income (loss), net of tax					$ 219
Issuance of common stock upon exercise of stock options (in shares)					126
Balances (in shares) at Jun. 30, 2021	38,995
Balance at Jun. 30, 2021	$ 39	424,507	(265)	(31,286)	$ 392,995
Balances (in shares) at Mar. 31, 2021	39,203
Balance at Mar. 31, 2021	$ 39	420,950	120	(24,001)	397,108
Net income	0	0	0	21,142	21,142
Other comprehensive income (loss), net of tax	$ 0	0	(385)	0	(385)
Issuance of common stock upon exercise of stock options (in shares)	57
Issuance of common stock upon exercise of stock options	$ 0	2,174	0	0	2,174
Repurchase of common stock (in shares)	(316)
Repurchase of common stock	$ 0	(3,796)	0	(28,427)	(32,223)
Issuance of common stock upon vesting of restricted stock units (in shares)	84
Issuance of common stock upon vesting of restricted stock units	$ 0	0	0	0	0
Taxes related to net share settlement of equity awards (in shares)	(33)
Taxes related to net share settlement of equity awards	$ 0	(3,374)	0	0	(3,374)
Stock-based compensation	$ 0	8,553	0	0	8,553
Balances (in shares) at Jun. 30, 2021	38,995
Balance at Jun. 30, 2021	$ 39	$ 424,507	$ (265)	$ (31,286)	$ 392,995

Note 1 - Description of Busines

Note 1 - Description of Business and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	NOTE 1. Description of Business and Summary of Significant Accounting Policies Description of Business Qualys, Inc. (the “Company”, "we", "us", "our") was incorporated in the state of Delaware on December 30, 1999. Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10 December 31, 2020 not three six June 30, 2021 not December 31, 2021 10 December 31, 2020 Risks and Uncertainties In March 2020, 19" 19, may may not 19 19 may Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the condensed consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, allowance for credit loss, the valuation of goodwill and intangible assets, leases, stock-based compensation and income tax provision. Actual results could differ from those estimates and such differences may Revenue Recognition The Company derives revenues from subscriptions that require customers to pay a fee in order to access the Company’s cloud solutions. Contract period with customers generally ranges from less than a year to five not not not The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. At the inception of a customer contract, the Company makes an assessment as to that customer's ability to pay for the services provided. The Company assesses collectability based on several factors, including credit worthiness of the customer along with past transaction history. In addition, the Company performs periodic evaluations of its customers’ financial condition. Most of the Company’s revenue contracts are subscription based and contain a single performance obligation. The subscription contracts typically do not 606. not not As the Company's cloud-based subscription services are delivered to customers electronically and over time, revenue is generally recognized ratably over the contract terms. A cumulative catch-up adjustment is made when there is a change in the estimate of variable consideration. In addition, the Company recognizes revenues for certain limited scan arrangements on an as-used basis. When physical equipment is provided to the customers as part of the subscription service contract, the Company applies the practical expedient allowed under ASC 842 606, Deferred revenues consist of customer contracts billed or cash received that will be recognized in the future under subscriptions existing at the balance sheet date. The current portion of deferred revenues represents amounts that are expected to be recognized within one Costs of shipping and handling charges incurred by the Company associated with physical scanner appliances and other computer equipment are included in cost of revenues. Sales taxes and other taxes collected from customers to be remitted to government authorities are excluded from revenues. Incremental direct costs of obtaining a contract, which consist of sales commissions primarily for new business and upsells, are deferred and amortized over the estimated life of the customer relationship if renewals are expected and the renewal commission is not one five Non-Marketable Securities During the fiscal year ended December 31, 2018, not no may not No not Recently Adopted Accounting Pronouncements In December 2019, No. 2019 12, 2019 12" 740, 2019 12 December 15, 2020. 2019 12 first 2021 no Recently Issued Accounting Pronouncements Not Although there were several other new accounting pronouncements issued by the FASB during the six June 30, 2021 not There have been no 1" 10 December 31, 2020.

Note 2 - Fair Value of Financia

Note 2 - Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 2. Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For certain of the Company’s financial instruments, including certain cash equivalents, accounts receivable, accounts payable and accrued liabilities, the carrying amounts approximate their fair values due to the relatively short maturity of these balances. The Company measures and reports certain cash equivalents, marketable securities, derivative foreign currency forward contracts at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value 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. The hierarchy is broken down into three Level 1 Level 2 Level 3 The Company's financial instruments consist of assets and liabilities measured using Level 1 2 1 2 The Company's cash and cash equivalents, and marketable securities consist of the following: June 30, 2021 Unrealized Unrealized Amortized Cost Gains Losses Fair Value (in thousands) Cash and cash equivalents: Cash $ 49,521 $ — $ — $ 49,521 Money market funds 46,557 — — 46,557 Commercial paper 1,200 — — 1,200 Total 97,278 — — 97,278 Short-term marketable securities: Commercial paper 25,133 — (1 ) 25,132 Corporate bonds 33,002 191 — 33,193 Asset-backed securities 4,504 4 — 4,508 U.S. Treasury and government agencies 199,971 139 (2 ) 200,108 Total 262,610 334 (3 ) 262,941 Long-term marketable securities: Asset-backed securities 15,236 41 (10 ) 15,267 U.S. Treasury and government agencies 41,178 9 (14 ) 41,173 Foreign government 1,006 24 — 1,030 Corporate bonds 52,970 472 (22 ) 53,420 Total 110,390 546 (46 ) 110,890 Total $ 470,278 $ 880 $ (49 ) $ 471,109 December 31, 2020 Unrealized Unrealized Amortized Cost Gains Losses Fair Value (in thousands) Cash and cash equivalents: Cash $ 33,105 $ — $ — $ 33,105 Money market funds 38,028 — — 38,028 Commercial paper 2,999 — — 2,999 Total 74,132 — — 74,132 Short-term marketable securities: Commercial paper 6,147 — — 6,147 Corporate bonds 24,368 170 — 24,538 Asset-backed securities 6,263 18 — 6,281 U.S. Treasury and government agencies 244,568 369 (11 ) 244,926 Total 281,346 557 (11 ) 281,892 Long-term marketable securities: Asset-backed securities 38,456 160 (3 ) 38,613 U.S. Treasury and government agencies 6,884 17 — 6,901 Foreign government 1,006 31 — 1,037 Corporate bonds 51,068 839 — 51,907 Total 97,414 1,047 (3 ) 98,458 Total $ 452,892 $ 1,604 $ (14 ) $ 454,482 As of June 30, 2021 December 31, 2020, 12 not The following table sets forth by level within the fair value hierarchy the fair value of the Company's cash equivalents and marketable securities measured on a recurring basis: June 30, 2021 Level 1 Level 2 Fair Value (in thousands) Money market funds $ 46,557 $ — $ 46,557 Commercial paper — 26,332 26,332 U.S. Treasury and government agencies — 241,281 241,281 Foreign government — 1,030 1,030 Corporate bonds — 86,613 86,613 Asset-backed securities — 19,775 19,775 Total $ 46,557 $ 375,031 $ 421,588 December 31, 2020 Level 1 Level 2 Fair Value (in thousands) Money market funds $ 38,028 $ — $ 38,028 Commercial paper — 9,146 9,146 U.S. Treasury and government agencies — 251,827 251,827 Foreign government — 1,037 1,037 Corporate bonds — 76,445 76,445 Asset-backed securities — 44,894 44,894 Total $ 38,028 $ 383,349 $ 421,377 The following summarizes the fair value of marketable securities by contractual maturity as of June 30, 2021 June 30, 2021 Mature within Mature after One Year Mature over One Year through Two Years Two Years Fair Value (in thousands) Commercial paper $ 26,332 $ — $ — $ 26,332 U.S. Treasury and government agencies 200,108 41,173 — 241,281 Foreign government — 1,030 — 1,030 Corporate bonds 33,193 36,855 16,565 86,613 Asset-backed securities 4,508 5,327 9,940 19,775 Total $ 264,141 $ 84,385 $ 26,505 $ 375,031 Derivative Financial Instruments Designated cash flow hedges The Company enters into foreign currency forward contracts to reduce the risk of variability in future cash flow due to foreign currency exchange rate fluctuation from certain forecasted subscription revenue orders billed in British Pound ("GBP") and Euro and operation expenses incurred in Indian Rupee ("INR"), which are designated as cash flow hedges. Unrealized foreign exchange gains or losses related to those designated cash flow hedge contracts are recorded in Accumulated other comprehensive income ("AOCI") and will be reclassified into revenues or operating expenses, respectively, in the same periods when the hedged transactions hit earnings. As of June 30, 2021 €24.3 £8.6 million and Rs.2,507.7 December 31, 2020 €25.9 £8.7 Rs.1,933.5 As of June 30, 2021 , a net amount of unrealized losses of $1.4 million before tax on the foreign currency forward contracts for GBP and Euro reported in AOCI is expected to be reclassified into revenue within the next 12 June 30, 2021 , a net amount of unrealized gains of $0.1 million before tax on the foreign currency forward contracts for INR reported in AOCI is expected to be reclassified into operating expenses within the next 12 Non-designated forward contracts The Company also uses foreign currency forward contracts to hedge certain foreign currency denominated assets or liabilities, which are not As of June 30, 2021 f €22.2 £10.1 Rs.150.0 December 31, 2020 €17.7 £6.5 Rs.32.8 The following summarizes derivative financial instruments as of June 30, 2021 December 31, 2020 June 30, December 31, 2021 2020 Assets (in thousands) Foreign currency forward contracts designated as cash flow hedge $ 664 $ 511 Foreign currency forward contracts not designated as hedging instruments 913 27 Total $ 1,577 $ 538 Liabilities Foreign currency forward contracts designated as cash flow hedge $ (581 ) $ (2,200 ) Foreign currency forward contracts not designated as hedging instruments (548 ) (1,677 ) Total $ (1,129 ) $ (3,877 ) All foreign currency forward contracts were valued at fair value using Level 2 The following summarizes the gains (losses) recognized from forward contracts and other foreign currency transactions in other income (expense), net on the condensed consolidated statements of operations: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Net gains (losses) from non-designated forward contracts $ (41 ) $ (224 ) $ 1,044 $ 580 Other foreign currency transactions gains (losses) 30 475 (1,228 ) (396 ) Total foreign exchange gains (losses), net (11 ) 251 (184 ) 184 Other expenses (69 ) (57 ) (140 ) (125 ) Other income (expense), net $ (80 ) $ 194 $ (324 ) $ 59

Note 3 - Accumulated Other Comp

Note 3 - Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Accumulated Other Comprehensive Income Disclosure [Text Block]	NOTE 3. Accumulated Other Comprehensive Income (Loss) The components and changes in accumulated other comprehensive income (loss) for the three six June 30, 2021 2020 Available-for-sale debt securities Cash flow hedges Total (in thousands) Balances at December 31, 2020 $ 1,224 $ (1,708 ) $ (484 ) Change in unrealized gains (losses) during the period (501 ) 1,092 591 Net losses reclassified into income during the period 8 192 200 Income tax benefit (provision) 104 (291 ) (187 ) Net change during the period (389 ) 993 604 Balances at March 31, 2021 835 (715 ) 120 Change in unrealized losses during the period (273 ) (394 ) (667 ) Net losses reclassified into income during the period 8 152 160 Income tax benefit 63 59 122 Net change during the period (202 ) (183 ) (385 ) Balances at June 30, 2021 $ 633 $ (898 ) $ (265 ) Balances at December 31, 2019 $ 822 $ 340 $ 1,162 Change in unrealized gains during the period 455 386 841 Net gains reclassified into income during the period (110 ) (224 ) (334 ) Income tax provision (79 ) (37 ) (116 ) Net change during the period 266 125 391 Balances at March 31, 2020 1,088 465 1,553 Change in unrealized gains (losses) during the period 1,417 (117 ) 1,300 Net gains reclassified into income during the period (20 ) (137 ) (157 ) Income tax benefit (provision) (319 ) 58 (261 ) Net change during the period 1,078 (196 ) 882 Balances at June 30, 2020 $ 2,166 $ 269 $ 2,435 The effects on income before income taxes of amounts reclassified from AOCI to the condensed consolidated statements of operations were as follows: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Reclassification of AOCI - Available-for-sale debt securities Other income (expense), net $ (8 ) $ 20 $ (16 ) $ 130 Reclassification of AOCI - Cash flow hedges Revenues (456 ) 328 (673 ) 576 Cost of revenues 61 (36 ) 66 (41 ) Research and development expenses 204 (127 ) 221 (143 ) Sales and marketing expenses 12 (10 ) 13 (11 ) General and administrative expenses 27 (18 ) 29 (20 ) Total $ (152 ) $ 137 $ (344 ) $ 361

Note 4 - Property and Equipment

Note 4 - Property and Equipment, Net	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	NOTE 4. Property and Equipment, Net Property and equipment, net, which includes assets under finance leases, consists of the following: June 30, December 31, 2021 2020 (in thousands) Computer equipment $ 151,878 $ 136,286 Computer software 25,795 26,164 Leasehold improvements 21,092 21,107 Scanner appliances 16,770 16,749 Furniture, fixtures and equipment 6,672 6,599 Finance leases - right of use asset — 3,503 Total property and equipment 222,207 210,408 Less: accumulated depreciation and amortization (156,248 ) (145,558 ) Property and equipment, net $ 65,959 $ 64,850 As of June 30, 2021 and December 31, 2020 , physical scanner appliances and other computer equipment that are or will be subject to leases by customers had a net carrying value of $7.3 million and $7.5 million, respectively, including assets that had not three June 30, 2021 2020 , respectively, and $14.2 million and $12.6 million for the six June 30, 2021 2020 , respectively. June 30, 2021.

Note 5 - Revenue from Contracts

Note 5 - Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	NOTE 5. Revenue from Contracts with Customers The Company records deferred revenue when cash payments are received or due in advance of its performance offset by revenue recognized in the period. Revenues of $63.5 million a three June 30, 2021 2020 December 31, 2020 2019 f $147.0 million and $12 9.7 six June 30, 2021 2020 December 31, 2020 2019 The Company's payment terms vary by the type and location of its customers. The term between invoicing and when payment is due is not The following table sets forth the expected revenue from all remaining performance obligations as of June 30, 2021 (in thousands) 2021 (remaining six months) $ 61,858 2022 95,612 2023 58,327 2024 7,839 2025 1,833 2026 and thereafter 234 Total $ 225,703 Revenues allocated to remaining performance obligations represents the transaction price of noncancelable orders for which service has not one From time to time, the Company enters into contracts with customers that extend beyond one one not Revenues by sales channel are as follows: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Direct $ 58,782 $ 51,805 $ 116,734 $ 101,810 Partner 40,920 37,025 79,724 73,283 Total $ 99,702 $ 88,830 $ 196,458 $ 175,093 The Company utilizes partners to enable and accelerate the adoption of its cloud platform by increasing its distribution capabilities and market awareness of its cloud platform as well as by targeting geographic regions outside the reach of its direct sales force. The Company's channel partners maintain relationships with their customers throughout the territories in which they operate and provide their customers with services and third may one not 12, Deferred costs to obtain contracts are as follows: June 30, 2021 December 31, 2020 (in thousands) Current $ 3,757 $ 3,459 Noncurrent $ 6,980 $ 6,906 For the three June 30, 2021 2020 , the Company recognized $0.9 million and $0.7 million, respectively, of amortization expense relating to deferred costs to obtain contracts. For the six June 30, 2021 2020 , the Company recognized $1.8 million and $1.4 million, respectively, of amortization expense relating to deferred costs to obtain contracts. During the same periods, there was no impairment loss related to the deferred costs to obtain contracts.

Note 6 - Intangible Assets, Net

Note 6 - Intangible Assets, Net	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Intangible Assets Disclosure [Text Block]	NOTE 6. Intangible Assets, Net Intangible assets consist primarily of developed technology and patent licenses acquired from business or asset acquisitions. Acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets. The carrying values of intangible assets are as follows: June 30, 2021 Weighted Average Weighted Average Life Remaining Life Accumulated (in thousands) (Years) (Years) Cost Amortization Net Book Value Developed technology 4.4 1.3 $ 27,356 $ (19,268 ) $ 8,088 Patent licenses 14.0 3.2 1,387 (1,071 ) 316 Non-compete agreements 2.0 1.1 500 (229 ) 271 Total intangibles subject to amortization $ 29,243 $ (20,568 ) 8,675 Intangible assets not subject to amortization 40 Total intangible assets, net $ 8,715 December 31, 2020 Weighted Average Weighted Average Life Remaining Life Accumulated (in thousands) (Years) (Years) Cost Amortization Net Book Value Developed technology 4.4 1.8 $ 27,356 $ (16,152 ) $ 11,204 Patent licenses 14.0 3.7 1,387 (1,021 ) 366 Non-compete agreements 2.0 1.6 500 (104 ) 396 Total intangibles subject to amortization $ 29,243 $ (17,277 ) 11,966 Intangible assets not subject to amortization 40 Total intangible assets, net $ 12,006 Intangible asset amortization expense was $1.6 million and $1.5 million for the three June 30, 2021 2020 , respectively, and $3.3 million and $3.0 million for the six June 30, 2021 2020 , respectively. Intangible asset amortization expenses were primarily recorded in cost of revenues in the condensed consolidated statements of operations. As of June 30, 2021 (in thousands) 2021 (remaining six months) $ 3,290 2022 4,823 2023 350 2024 212 Total expected future amortization expense $ 8,675

Note 7 - Leases

Note 7 - Leases	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Lessee, Operating Leases and Finance Lease [Text Block]	NOTE 7. Leases The Company leases certain offices, computer equipment and its data center facilities under non-cancelable operating leases for varying periods through 2028. not not three June 30, 2021 2020 , respectively, and $7.2 million and $8.9 million for the six June 30, 2021 2020 , respectively. Supplemental cash flow information related to operating leases was as follows: Six Months Ended June 30, 2021 2020 (in thousands) Cash payments included in the measurement of lease liabilities $ 6,853 $ 5,106 Lease liabilities arising from obtaining right-of-use assets $ 1,179 $ 7,033 The weighted average remaining lease term and the weighted average discount rate of the Company's operating leases were as follows: June 30, 2021 December 31, 2020 Weighted average remaining lease term (years) 3.6 4.1 Weighted average discount rate 4.8 % 4.8 %

Note 8 - Commitments and Contin

Note 8 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 8. Commitments and Contingencies Indemnifications The Company from time to time enters into certain types of contracts that contingently require it to indemnify various parties against claims from third may may not not The Company maintains director and officer insurance, which may

Note 9 - Stockholders' Equity a

Note 9 - Stockholders' Equity and Stock-based Compensation	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	NOTE 9. Stockholders' Equity and Stock-Based Compensation Equity Incentive Plans 2012 Under the 2012 "2012 17,662 thousand shares June 30, 2021 1,963 thousand shares auth six June 30, 2021 may June 30, 2021 8,572 thousand shares were 2012 2000 Under the 2000 "2000 2000 2000 2000 2021 On June 9, 2021, 2021 August 16 February 16 first Stock-Based Compensation The following table shows a summary of the stock-based compensation expense included in the condensed consolidated statements of operations: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Cost of revenues $ 841 $ 583 $ 1,716 $ 1,197 Research and development 2,582 3,253 4,797 6,690 Sales and marketing 1,086 1,513 2,714 3,073 General and administrative 4,044 4,095 37,528 8,481 Total stock-based compensation $ 8,553 $ 9,444 $ 46,755 $ 19,441 As of June 30, 2021 , the Company h ad $14.5 million of total unrecognized stock-based compensation expense related to unvested options which are expected to be recognized over a weighted-average period of 2.7 years, and $53.8 million of unrecognized stock-based compensation expense related to unvested RSUs which are expected to be recognized over a weighted-average period of 2.7 years. Performance-Based Restricted Stock Units and Stock Options On April 27, 2021, three January 2021 December 2023. On March 19, 2021, 2021, 2020 2019 100% six June 30, 2021. In February 2021 February 2020, 2019 2020 2019, Stock Option Activity A summary of the Company’s stock option activity is as follows: Weighted Weighted Average Outstanding Average Remaining Aggregate Options Exercise Price Contractual Life Intrinsic Value (in thousands) (Years) (in thousands) Balance as of December 31, 2020 2,215 $ 59.07 6.5 $ 139,121 Granted 205 $ 114.62 Exercised (126 ) $ 35.25 Canceled (62 ) $ 99.91 Balance as of June 30, 2021 2,232 $ 64.37 5.1 $ 85,821 Vested and expected to vest - June 30, 2021 2,080 $ 61.38 4.8 $ 85,211 Exercisable - June 30, 2021 1,641 $ 50.67 3.7 $ 82,435 Restricted Stock Unit Activity A summary of the Company’s RSU activity is as follows: Weighted Average Grant Date Outstanding Fair Value RSUs Per Share (in thousands) Balance as of December 31, 2020 1,047 $ 86.78 Granted 181 $ 112.67 Vested (389 ) $ 84.51 Canceled (117 ) $ 83.01 Balance as of June 30, 2021 722 $ 95.12 Outstanding and expected to vest - June 30, 2021 633 $ 93.74 Share Repurchase Program On February 5, 2018, two February 12, 2018. October 30, 2018, October 30, 2019, May 7, 2020 February 10, 2021, may 10b 18 1934, 10b5 1 February 14, 2022. Repurchased shares are retired and reclassified as authorized and unissued shares of common stock. On retirement of the repurchased shares, common stock is reduced by an amount equal to the number of shares being retired multiplied by the par value. The excess amount that is retired over its par value is first During the six June 30, 2021 June 30, 2021

Note 10 - Net Income Per Share

Note 10 - Net Income Per Share	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 10. Net Income Per Share The computations for basic and diluted net income per share are as follows: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands, except per share data) Numerator: Net income $ 21,142 $ 26,319 $ 21,370 $ 45,013 Denominator: Basic weighted average shares 39,099 39,161 39,154 39,137 Effect of potentially dilutive shares: Common stock options 831 1,382 851 1,402 Restricted stock units 147 376 248 344 Diluted weighted average shares 40,077 40,919 40,253 40,883 Net income per share: Basic $ 0.54 $ 0.67 $ 0.55 $ 1.15 Diluted $ 0.53 $ 0.64 $ 0.53 $ 1.10 Potentially dilutive shares not Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Common stock options 675 452 524 517 Restricted stock units 153 2 96 34 Total anti-dilutive shares 828 454 620 551

Note 11 - Income Taxes

Note 11 - Income Taxes	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 11. Income Taxes The Company's income tax provision for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. The Company's quarterly tax provision, and estimate of its annual effective tax rate, is subject to variation due to several factors, including variability in pre-tax income (or loss), the mix of jurisdictions to which such income relates, changes in how the Company does business, and tax law developments. The Company's estimated effective tax rate for the year differs from the U.S. statutory rate of 21% The Company recorded an income tax provision of $8.7 million and $0.8 million for the three June 30, 2021 2020 , respectively, resulting in an effective tax rate of 29.2% and 2.9%, respectively. The increase in income tax provision for the three June 30, 2021 compared to the three June 30, 2020 was primarily due to an increase in pre-tax income and a reduction in excess tax benefits from stock-based compensation. The Company recorded an income tax provision of $6.3 million and $4.3 million for the six June 30, 2021 2020 , respectively, resulting in an effective tax rate of 22.7% and 8.7%, respectively. The increase in income tax provision for the six June 30, 2021 compared to the six June 30, 2020 was primarily due to an increase in non-deductible stock-based compensation and a reduction in excess tax benefits from stock-based compensation. As of June 30, 2021 , the Company had unrecognized tax benefits of $9.4 million, of which $4.8 million, if recognized, would favorably impact the Company's effective tax rate. As of December 31, 2020 , the Company had unrecognized tax benefits of $8.9 million, of which $4.6 million, if recognized, would favorably impact the Company's effective tax rate. The Company does not 12 On June 29, 2020, 2020 $5 2020, 2021 2022. 2020 not

Note 12 - Segment Information a

Note 12 - Segment Information and Information About Geographic Area	6 Months Ended
	Jun. 30, 2021
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 12. Segment Information and Information about Geographic Area Under ASC 280 one one Revenue by geographic area, based on the customer's billing address, is as follows: Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) United States $ 60,991 $ 57,015 $ 121,123 $ 111,978 Foreign 38,711 31,815 75,335 63,115 Total revenues $ 99,702 $ 88,830 $ 196,458 $ 175,093 Property and equipment, net, by geographic area, is as follows: June 30, December 31, 2021 2020 (in thousands) United States $ 45,535 $ 43,791 India 11,789 12,465 Rest of world 8,635 8,594 Total property and equipment, net $ 65,959 $ 64,850

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Description Of Business Policy [Policy Text Block]	Description of Business Qualys, Inc. (the “Company”, "we", "us", "our") was incorporated in the state of Delaware on December 30, 1999.
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for interim financial information as well as the instructions to Form 10 December 31, 2020 not three six June 30, 2021 not December 31, 2021 10 December 31, 2020
Risk and Uncertainties, Policy [Policy Text Block]	Risks and Uncertainties In March 2020, 19" 19, may may not 19 19 may
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the condensed consolidated financial statements and the reported results of operations during the reporting period. The Company’s management regularly assesses these estimates, which primarily affect revenue recognition, allowance for credit loss, the valuation of goodwill and intangible assets, leases, stock-based compensation and income tax provision. Actual results could differ from those estimates and such differences may
Revenue from Contract with Customer [Policy Text Block]	Revenue Recognition The Company derives revenues from subscriptions that require customers to pay a fee in order to access the Company’s cloud solutions. Contract period with customers generally ranges from less than a year to five not not not The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. At the inception of a customer contract, the Company makes an assessment as to that customer's ability to pay for the services provided. The Company assesses collectability based on several factors, including credit worthiness of the customer along with past transaction history. In addition, the Company performs periodic evaluations of its customers’ financial condition. Most of the Company’s revenue contracts are subscription based and contain a single performance obligation. The subscription contracts typically do not 606. not not As the Company's cloud-based subscription services are delivered to customers electronically and over time, revenue is generally recognized ratably over the contract terms. A cumulative catch-up adjustment is made when there is a change in the estimate of variable consideration. In addition, the Company recognizes revenues for certain limited scan arrangements on an as-used basis. When physical equipment is provided to the customers as part of the subscription service contract, the Company applies the practical expedient allowed under ASC 842 606, Deferred revenues consist of customer contracts billed or cash received that will be recognized in the future under subscriptions existing at the balance sheet date. The current portion of deferred revenues represents amounts that are expected to be recognized within one Costs of shipping and handling charges incurred by the Company associated with physical scanner appliances and other computer equipment are included in cost of revenues. Sales taxes and other taxes collected from customers to be remitted to government authorities are excluded from revenues. Incremental direct costs of obtaining a contract, which consist of sales commissions primarily for new business and upsells, are deferred and amortized over the estimated life of the customer relationship if renewals are expected and the renewal commission is not one five
Securities Owned Not Readily Marketable, Policy [Policy Text Block]	Non-Marketable Securities During the fiscal year ended December 31, 2018, not no may not No not
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Pronouncements In December 2019, No. 2019 12, 2019 12" 740, 2019 12 December 15, 2020. 2019 12 first 2021 no Recently Issued Accounting Pronouncements Not Although there were several other new accounting pronouncements issued by the FASB during the six June 30, 2021 not There have been no 1" 10 December 31, 2020.

Note 2 - Fair Value of Financ_2

Note 2 - Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Cash and Cash Equivalents and Debt Securities, Available-for-sale, Amortized Cost to Fair Value [Table Text Block]	June 30, 2021 Unrealized Unrealized Amortized Cost Gains Losses Fair Value (in thousands) Cash and cash equivalents: Cash $ 49,521 $ — $ — $ 49,521 Money market funds 46,557 — — 46,557 Commercial paper 1,200 — — 1,200 Total 97,278 — — 97,278 Short-term marketable securities: Commercial paper 25,133 — (1 ) 25,132 Corporate bonds 33,002 191 — 33,193 Asset-backed securities 4,504 4 — 4,508 U.S. Treasury and government agencies 199,971 139 (2 ) 200,108 Total 262,610 334 (3 ) 262,941 Long-term marketable securities: Asset-backed securities 15,236 41 (10 ) 15,267 U.S. Treasury and government agencies 41,178 9 (14 ) 41,173 Foreign government 1,006 24 — 1,030 Corporate bonds 52,970 472 (22 ) 53,420 Total 110,390 546 (46 ) 110,890 Total $ 470,278 $ 880 $ (49 ) $ 471,109 December 31, 2020 Unrealized Unrealized Amortized Cost Gains Losses Fair Value (in thousands) Cash and cash equivalents: Cash $ 33,105 $ — $ — $ 33,105 Money market funds 38,028 — — 38,028 Commercial paper 2,999 — — 2,999 Total 74,132 — — 74,132 Short-term marketable securities: Commercial paper 6,147 — — 6,147 Corporate bonds 24,368 170 — 24,538 Asset-backed securities 6,263 18 — 6,281 U.S. Treasury and government agencies 244,568 369 (11 ) 244,926 Total 281,346 557 (11 ) 281,892 Long-term marketable securities: Asset-backed securities 38,456 160 (3 ) 38,613 U.S. Treasury and government agencies 6,884 17 — 6,901 Foreign government 1,006 31 — 1,037 Corporate bonds 51,068 839 — 51,907 Total 97,414 1,047 (3 ) 98,458 Total $ 452,892 $ 1,604 $ (14 ) $ 454,482
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	June 30, 2021 Level 1 Level 2 Fair Value (in thousands) Money market funds $ 46,557 $ — $ 46,557 Commercial paper — 26,332 26,332 U.S. Treasury and government agencies — 241,281 241,281 Foreign government — 1,030 1,030 Corporate bonds — 86,613 86,613 Asset-backed securities — 19,775 19,775 Total $ 46,557 $ 375,031 $ 421,588 December 31, 2020 Level 1 Level 2 Fair Value (in thousands) Money market funds $ 38,028 $ — $ 38,028 Commercial paper — 9,146 9,146 U.S. Treasury and government agencies — 251,827 251,827 Foreign government — 1,037 1,037 Corporate bonds — 76,445 76,445 Asset-backed securities — 44,894 44,894 Total $ 38,028 $ 383,349 $ 421,377
Investments Classified by Contractual Maturity Date [Table Text Block]	June 30, 2021 Mature within Mature after One Year Mature over One Year through Two Years Two Years Fair Value (in thousands) Commercial paper $ 26,332 $ — $ — $ 26,332 U.S. Treasury and government agencies 200,108 41,173 — 241,281 Foreign government — 1,030 — 1,030 Corporate bonds 33,193 36,855 16,565 86,613 Asset-backed securities 4,508 5,327 9,940 19,775 Total $ 264,141 $ 84,385 $ 26,505 $ 375,031
Schedule of Derivative Instruments [Table Text Block]	June 30, December 31, 2021 2020 Assets (in thousands) Foreign currency forward contracts designated as cash flow hedge $ 664 $ 511 Foreign currency forward contracts not designated as hedging instruments 913 27 Total $ 1,577 $ 538 Liabilities Foreign currency forward contracts designated as cash flow hedge $ (581 ) $ (2,200 ) Foreign currency forward contracts not designated as hedging instruments (548 ) (1,677 ) Total $ (1,129 ) $ (3,877 )
Derivative Instruments, Gain (Loss) [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Net gains (losses) from non-designated forward contracts $ (41 ) $ (224 ) $ 1,044 $ 580 Other foreign currency transactions gains (losses) 30 475 (1,228 ) (396 ) Total foreign exchange gains (losses), net (11 ) 251 (184 ) 184 Other expenses (69 ) (57 ) (140 ) (125 ) Other income (expense), net $ (80 ) $ 194 $ (324 ) $ 59

Note 3 - Accumulated Other Co_2

Note 3 - Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Available-for-sale debt securities Cash flow hedges Total (in thousands) Balances at December 31, 2020 $ 1,224 $ (1,708 ) $ (484 ) Change in unrealized gains (losses) during the period (501 ) 1,092 591 Net losses reclassified into income during the period 8 192 200 Income tax benefit (provision) 104 (291 ) (187 ) Net change during the period (389 ) 993 604 Balances at March 31, 2021 835 (715 ) 120 Change in unrealized losses during the period (273 ) (394 ) (667 ) Net losses reclassified into income during the period 8 152 160 Income tax benefit 63 59 122 Net change during the period (202 ) (183 ) (385 ) Balances at June 30, 2021 $ 633 $ (898 ) $ (265 ) Balances at December 31, 2019 $ 822 $ 340 $ 1,162 Change in unrealized gains during the period 455 386 841 Net gains reclassified into income during the period (110 ) (224 ) (334 ) Income tax provision (79 ) (37 ) (116 ) Net change during the period 266 125 391 Balances at March 31, 2020 1,088 465 1,553 Change in unrealized gains (losses) during the period 1,417 (117 ) 1,300 Net gains reclassified into income during the period (20 ) (137 ) (157 ) Income tax benefit (provision) (319 ) 58 (261 ) Net change during the period 1,078 (196 ) 882 Balances at June 30, 2020 $ 2,166 $ 269 $ 2,435
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Reclassification of AOCI - Available-for-sale debt securities Other income (expense), net $ (8 ) $ 20 $ (16 ) $ 130 Reclassification of AOCI - Cash flow hedges Revenues (456 ) 328 (673 ) 576 Cost of revenues 61 (36 ) 66 (41 ) Research and development expenses 204 (127 ) 221 (143 ) Sales and marketing expenses 12 (10 ) 13 (11 ) General and administrative expenses 27 (18 ) 29 (20 ) Total $ (152 ) $ 137 $ (344 ) $ 361

Note 4 - Property and Equipme_2

Note 4 - Property and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Property, Plant and Equipment [Table Text Block]	June 30, December 31, 2021 2020 (in thousands) Computer equipment $ 151,878 $ 136,286 Computer software 25,795 26,164 Leasehold improvements 21,092 21,107 Scanner appliances 16,770 16,749 Furniture, fixtures and equipment 6,672 6,599 Finance leases - right of use asset — 3,503 Total property and equipment 222,207 210,408 Less: accumulated depreciation and amortization (156,248 ) (145,558 ) Property and equipment, net $ 65,959 $ 64,850

Note 5 - Revenue from Contrac_2

Note 5 - Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	(in thousands) 2021 (remaining six months) $ 61,858 2022 95,612 2023 58,327 2024 7,839 2025 1,833 2026 and thereafter 234 Total $ 225,703
Disaggregation of Revenue [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Direct $ 58,782 $ 51,805 $ 116,734 $ 101,810 Partner 40,920 37,025 79,724 73,283 Total $ 99,702 $ 88,830 $ 196,458 $ 175,093
Contract With Customer, Commission Asset Balances [Table Text Block]	June 30, 2021 December 31, 2020 (in thousands) Current $ 3,757 $ 3,459 Noncurrent $ 6,980 $ 6,906

Note 6 - Intangible Assets, N_2

Note 6 - Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	June 30, 2021 Weighted Average Weighted Average Life Remaining Life Accumulated (in thousands) (Years) (Years) Cost Amortization Net Book Value Developed technology 4.4 1.3 $ 27,356 $ (19,268 ) $ 8,088 Patent licenses 14.0 3.2 1,387 (1,071 ) 316 Non-compete agreements 2.0 1.1 500 (229 ) 271 Total intangibles subject to amortization $ 29,243 $ (20,568 ) 8,675 Intangible assets not subject to amortization 40 Total intangible assets, net $ 8,715 December 31, 2020 Weighted Average Weighted Average Life Remaining Life Accumulated (in thousands) (Years) (Years) Cost Amortization Net Book Value Developed technology 4.4 1.8 $ 27,356 $ (16,152 ) $ 11,204 Patent licenses 14.0 3.7 1,387 (1,021 ) 366 Non-compete agreements 2.0 1.6 500 (104 ) 396 Total intangibles subject to amortization $ 29,243 $ (17,277 ) 11,966 Intangible assets not subject to amortization 40 Total intangible assets, net $ 12,006
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(in thousands) 2021 (remaining six months) $ 3,290 2022 4,823 2023 350 2024 212 Total expected future amortization expense $ 8,675

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Lessee, Operating Lease, Supplemental Cash Flow Disclosure [Table Text Block]	Six Months Ended June 30, 2021 2020 (in thousands) Cash payments included in the measurement of lease liabilities $ 6,853 $ 5,106 Lease liabilities arising from obtaining right-of-use assets $ 1,179 $ 7,033
Lessee, Weighted Average Remaining Lease Term and Weighted Average Discount Rate [Table Text Block]	June 30, 2021 December 31, 2020 Weighted average remaining lease term (years) 3.6 4.1 Weighted average discount rate 4.8 % 4.8 %

Note 9 - Stockholders' Equity_2

Note 9 - Stockholders' Equity and Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Cost of revenues $ 841 $ 583 $ 1,716 $ 1,197 Research and development 2,582 3,253 4,797 6,690 Sales and marketing 1,086 1,513 2,714 3,073 General and administrative 4,044 4,095 37,528 8,481 Total stock-based compensation $ 8,553 $ 9,444 $ 46,755 $ 19,441
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Weighted Weighted Average Outstanding Average Remaining Aggregate Options Exercise Price Contractual Life Intrinsic Value (in thousands) (Years) (in thousands) Balance as of December 31, 2020 2,215 $ 59.07 6.5 $ 139,121 Granted 205 $ 114.62 Exercised (126 ) $ 35.25 Canceled (62 ) $ 99.91 Balance as of June 30, 2021 2,232 $ 64.37 5.1 $ 85,821 Vested and expected to vest - June 30, 2021 2,080 $ 61.38 4.8 $ 85,211 Exercisable - June 30, 2021 1,641 $ 50.67 3.7 $ 82,435
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Weighted Average Grant Date Outstanding Fair Value RSUs Per Share (in thousands) Balance as of December 31, 2020 1,047 $ 86.78 Granted 181 $ 112.67 Vested (389 ) $ 84.51 Canceled (117 ) $ 83.01 Balance as of June 30, 2021 722 $ 95.12 Outstanding and expected to vest - June 30, 2021 633 $ 93.74

Note 10 - Net Income Per Share

Note 10 - Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands, except per share data) Numerator: Net income $ 21,142 $ 26,319 $ 21,370 $ 45,013 Denominator: Basic weighted average shares 39,099 39,161 39,154 39,137 Effect of potentially dilutive shares: Common stock options 831 1,382 851 1,402 Restricted stock units 147 376 248 344 Diluted weighted average shares 40,077 40,919 40,253 40,883 Net income per share: Basic $ 0.54 $ 0.67 $ 0.55 $ 1.15 Diluted $ 0.53 $ 0.64 $ 0.53 $ 1.10
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) Common stock options 675 452 524 517 Restricted stock units 153 2 96 34 Total anti-dilutive shares 828 454 620 551

Note 12 - Segment Information_2

Note 12 - Segment Information and Information About Geographic Area (Tables)	6 Months Ended
	Jun. 30, 2021
Notes Tables
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 (in thousands) United States $ 60,991 $ 57,015 $ 121,123 $ 111,978 Foreign 38,711 31,815 75,335 63,115 Total revenues $ 99,702 $ 88,830 $ 196,458 $ 175,093 June 30, December 31, 2021 2020 (in thousands) United States $ 45,535 $ 43,791 India 11,789 12,465 Rest of world 8,635 8,594 Total property and equipment, net $ 65,959 $ 64,850

Note 1 - Description of Busin_2

Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2021
Capitalized Contract Cost, Amortization Period (Year)		5 years
Proceeds from Dividends Received	$ 0
Preferred Stock [Member]
Investments, Total	2,500
Other than Temporary Impairment Losses, Investments, Total	$ 0

Note 2 - Fair Value of Financ_3

Note 2 - Fair Value of Financial Instruments (Details Textual) Pure in Thousands, € in Millions, ₨ in Millions, £ in Millions, SFr in Millions, $ in Millions, $ in Millions	Jun. 30, 2021USD ($)	Jun. 30, 2021EUR (€)	Jun. 30, 2021GBP (£)	Jun. 30, 2021INR (₨)	Jun. 30, 2021CAD ($)	Jun. 30, 2021CHF (SFr)	Dec. 31, 2020EUR (€)	Dec. 31, 2020GBP (£)	Dec. 31, 2020INR (₨)
Marketable Securities In Unrealized Loss Positions, More Than 12 Months Qualitative Disclosure, Number Of Positions	0	0	0	0	0	0	0	0	0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount		€ 24.3	£ 8.6	₨ 2,507.7			€ 25.9	£ 8.7	₨ 1,933.5
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative, Notional Amount		€ 22.2	£ 10.1	₨ 150	$ 1	SFr 2	€ 17.7	£ 6.5	₨ 32.8
Foreign Exchange Contracts for GBP and Euro [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ (1.4)
Foreign Exchange Contracts for INR [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ 0.1

Note 2 - Fair Value of Financ_4

Note 2 - Fair Value of Financial Instruments - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 97,278	$ 74,132
Short-term marketable securities, amortization cost	262,610	281,346
Unrealized gains, short-term securities	334	557
Short-term marketable securities, unrealized loss	(3)	(11)
Short-term marketable securities	262,941	281,892
Long-term marketable securities, amortization cost	110,390	97,414
Unrealized gains, long-term securities	546	1,047
Long-term marketable securities, unrealized loss	(46)	(3)
Long-term marketable securities	110,890	98,458
Cash and cash equivalents and marketable securities, amortization cost	470,278	452,892
Unrealized gains, securities	880	1,604
Unrealized loss, securities	(49)	(14)
Cash and cash equivalents and short-term and long-term Marketable Securities, fair value	471,109	454,482
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Short-term marketable securities, amortization cost	25,133	6,147
Unrealized gains, short-term securities	0	0
Short-term marketable securities, unrealized loss	(1)	0
Short-term marketable securities	25,132	6,147
Corporate Debt Securities [Member]
Short-term marketable securities, amortization cost	33,002	24,368
Unrealized gains, short-term securities	191	170
Short-term marketable securities, unrealized loss	0	0
Short-term marketable securities	33,193	24,538
Long-term marketable securities, amortization cost	52,970	51,068
Unrealized gains, long-term securities	472	839
Long-term marketable securities, unrealized loss	(22)	0
Long-term marketable securities	53,420	51,907
Asset-backed Securities [Member]
Short-term marketable securities, amortization cost	4,504	6,263
Unrealized gains, short-term securities	4	18
Short-term marketable securities, unrealized loss	0	0
Short-term marketable securities	4,508	6,281
Long-term marketable securities, amortization cost	15,236	38,456
Unrealized gains, long-term securities	41	160
Long-term marketable securities, unrealized loss	(10)	(3)
Long-term marketable securities	15,267	38,613
US Government Agencies Debt Securities [Member]
Short-term marketable securities, amortization cost	199,971	244,568
Unrealized gains, short-term securities	139	369
Short-term marketable securities, unrealized loss	(2)	(11)
Short-term marketable securities	200,108	244,926
Long-term marketable securities, amortization cost	41,178	6,884
Unrealized gains, long-term securities	9	17
Long-term marketable securities, unrealized loss	(14)	0
Long-term marketable securities	41,173	6,901
Foreign Government Agencies [Member]
Long-term marketable securities, amortization cost	1,006	1,006
Unrealized gains, long-term securities	24	31
Long-term marketable securities, unrealized loss	0	0
Long-term marketable securities	1,030	1,037
Cash [Member]
Cash and cash equivalents	49,521	33,105
Money Market Funds [Member]
Cash and cash equivalents	46,557	38,028
Commercial Paper [Member]
Cash and cash equivalents	$ 1,200	$ 2,999

Note 2 - Fair Value of Financ_5

Note 2 - Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Money market funds	$ 46,557	$ 38,028
Commercial paper	26,332	9,146
U.S. Treasury and government agencies	241,281	251,827
Foreign government	1,030	1,037
Corporate bonds	86,613	76,445
Asset-backed securities	19,775	44,894
Total	421,588	421,377
Fair Value, Inputs, Level 1 [Member]
Money market funds	46,557	38,028
Commercial paper	0	0
U.S. Treasury and government agencies	0	0
Foreign government	0	0
Corporate bonds	0	0
Asset-backed securities	0	0
Total	46,557	38,028
Fair Value, Inputs, Level 2 [Member]
Money market funds	0	0
Commercial paper	26,332	9,146
U.S. Treasury and government agencies	241,281	251,827
Foreign government	1,030	1,037
Corporate bonds	86,613	76,445
Asset-backed securities	19,775	44,894
Total	$ 375,031	$ 383,349

Note 2 - Fair Value of Financ_6

Note 2 - Fair Value of Financial Instruments - Summary of the Fair Value of Marketable Securities (Details) $ in Thousands	Jun. 30, 2021USD ($)
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	$ 264,141
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	84,385
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	26,505
Debt Securities, Available-for-sale	375,031
Commercial Paper [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	26,332
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	0
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	0
Debt Securities, Available-for-sale	26,332
US Government Agencies Debt Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	200,108
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	41,173
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	0
Debt Securities, Available-for-sale	241,281
Foreign Government Agencies [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	0
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	1,030
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	0
Debt Securities, Available-for-sale	1,030
Corporate Bond Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	33,193
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	36,855
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	16,565
Debt Securities, Available-for-sale	86,613
Asset-backed Securities [Member]
Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value	4,508
Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value	5,327
Available-for-sale Securities, Debt and Equity Maturities, Year over two years, Fair Value	9,940
Debt Securities, Available-for-sale	$ 19,775

Note 2 - Fair Value of Financ_7

Note 2 - Fair Value of Financial Instruments - Summary of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Foreign currency forward contracts	$ 1,577	$ 538
Foreign currency forward contracts	(1,129)	(3,877)
Designated as Hedging Instrument [Member]
Foreign currency forward contracts	664	511
Foreign currency forward contracts	(581)	(2,200)
Not Designated as Hedging Instrument [Member]
Foreign currency forward contracts	913	27
Foreign currency forward contracts	$ (548)	$ (1,677)

Note 2 - Fair Value of Financ_8

Note 2 - Fair Value of Financial Instruments - Amounts Recognized In Statement Of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net gains (losses) from non-designated forward contracts	$ (41)	$ (224)	$ 1,044	$ 580
Other foreign currency transactions gains (losses)	30	475	(1,228)	(396)
Total foreign exchange gains (losses), net	(11)	251	(184)	184
Other expenses	(69)	(57)	(140)	(125)
Other income (expense), net	$ (80)	$ 194	$ (324)	$ 59

Note 3 - Accumulated Other Co_3

Note 3 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 397,108	$ 404,482	$ 386,730	$ 386,803	$ 404,482	$ 386,803
Other comprehensive income (loss), net of tax	(385)	604	882	391	219	1,273
Balance	392,995	397,108	407,774	386,730	392,995	407,774
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	835	1,224	1,088	822	1,224	822
Change in unrealized gains (losses) during the period	(273)	(501)	1,417	455
Net losses reclassified into income during the period	8	8	(20)	(110)
Income tax benefit (provision)	63	104	(319)	(79)
Other comprehensive income (loss), net of tax	(202)	(389)	1,078	266
Balance	633	835	2,166	1,088	633	2,166
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	(715)	(1,708)	465	340	(1,708)	340
Change in unrealized gains (losses) during the period	(394)	1,092	(117)	386
Net losses reclassified into income during the period	152	192	(137)	(224)
Income tax benefit (provision)	59	(291)	58	(37)
Other comprehensive income (loss), net of tax	(183)	993	(196)	125
Balance	(898)	(715)	269	465	(898)	269
AOCI Attributable to Parent [Member]
Balance	120	(484)	1,553	1,162	(484)	1,162
Change in unrealized gains (losses) during the period	(667)	591	1,300	841
Net losses reclassified into income during the period	160	200	(157)	(334)
Income tax benefit (provision)	122	(187)	(261)	(116)
Other comprehensive income (loss), net of tax	(385)	604	882	391
Balance	$ (265)	$ 120	$ 2,435	$ 1,553	$ (265)	$ 2,435

Note 3 - Accumulated Other Co_4

Note 3 - Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other income (expense), net	$ 80	$ (194)	$ 324	$ (59)
Revenues	99,702	88,830	196,458	175,093
Cost of revenues	21,552	18,891	43,232	37,386
Research and development	19,805	18,058	37,554	36,041
Sales and marketing	17,770	15,783	35,759	34,013
General and administrative	11,213	10,590	53,256	21,714
Total	29,849	27,094	27,642	49,311
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Other income (expense), net	(8)	20	(16)	130
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Revenues	(456)	328	(673)	576
Cost of revenues	61	(36)	66	(41)
Research and development	204	(127)	221	(143)
Sales and marketing	12	(10)	13	(11)
General and administrative	27	(18)	29	(20)
Total	$ (152)	$ 137	$ (344)	$ 361

Note 4 - Property and Equipme_3

Note 4 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment, Net, Ending Balance	$ 65,959		$ 65,959		$ 64,850
Depreciation, Depletion And Amortization, Excluding Intangible Asset Amortization	6,900	$ 6,400	14,200	$ 12,600
Scanner Appliances and Other Computer Equipment Subject To Subscription [Member]
Property, Plant and Equipment, Net, Ending Balance	7,300		7,300		7,500
Scanner Appliances and Other Computer Equipment Not Placed In Service [Member]
Property, Plant and Equipment, Net, Ending Balance	$ 2,200		$ 2,200		$ 1,900

Note 4 - Property and Equipme_4

Note 4 - Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property and equipment and finance lease	$ 222,207	$ 210,408
Less: accumulated depreciation and amortization	(156,248)	(145,558)
Property and equipment and finance lease, net	65,959	64,850
Computer Equipment [Member]
Property and equipment and finance lease	151,878	136,286
Computer Software, Intangible Asset [Member]
Property and equipment and finance lease	25,795	26,164
Leasehold Improvements [Member]
Property and equipment and finance lease	21,092	21,107
Scanner Appliances [Member]
Property and equipment and finance lease	16,770	16,749
Furniture and Fixtures [Member]
Property and equipment and finance lease	6,672	6,599
Assets Held under Capital Leases [Member]
Property and equipment and finance lease	$ 0	$ 3,503

Note 5 - Revenue from Contrac_3

Note 5 - Revenue from Contracts with Customers (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Contract with Customer, Liability, Revenue Recognized	$ 63,500	$ 55,900	$ 147,000	$ 129,700
Amortization of Deferred Sales Commissions	900	700	1,800	1,400
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0	$ 0	$ 0

Note 5 - Revenue from Contrac_4

Note 5 - Revenue from Contracts with Customers - Expected Revenue from All Remaining Performance Obligations (Details) $ in Thousands	Jun. 30, 2021USD ($)
Remaining performance obligations	$ 225,703

Note 5 - Revenue from Contrac_5

Note 5 - Revenue from Contracts with Customers - Expected Revenue from All Remaining Performance Obligations 2 (Details) $ in Thousands	Jun. 30, 2021USD ($)
Remaining performance obligations	$ 225,703
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Remaining performance obligations, period (Year)	6 months
Remaining performance obligations	$ 61,858
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Remaining performance obligations, period (Year)	1 year
Remaining performance obligations	$ 95,612
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Remaining performance obligations, period (Year)	1 year
Remaining performance obligations	$ 58,327
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Remaining performance obligations, period (Year)	1 year
Remaining performance obligations	$ 7,839
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Remaining performance obligations, period (Year)	1 year
Remaining performance obligations	$ 1,833
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Remaining performance obligations, period (Year)	1 year
Remaining performance obligations	$ 234

Note 5 - Revenue from Contrac_6

Note 5 - Revenue from Contracts with Customers - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 99,702	$ 88,830	$ 196,458	$ 175,093
Sales Channel, Directly to Consumer [Member]
Revenues	58,782	51,805	116,734	101,810
Sales Channel, Through Intermediary [Member]
Revenues	$ 40,920	$ 37,025	$ 79,724	$ 73,283

Note 5 - Revenue from Contrac_7

Note 5 - Revenue from Contracts with Customers - Capitalized Cost to Obtain Contracts, Current and Noncurrent (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current	$ 3,757	$ 3,459
Noncurrent	$ 6,980	$ 6,906

Note 6 - Intangible Assets, N_3

Note 6 - Intangible Assets, Net (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Amortization of Intangible Assets, Total	$ 1.6	$ 1.5	$ 3.3	$ 3

Note 6 - Intangible Assets, N_4

Note 6 - Intangible Assets, Net - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Cost	$ 29,243	$ 29,243
Amortization of intangible assets	(20,568)	(17,277)
Net Book Value	8,675	11,966
Intangible assets, net	8,715	12,006
Intangible Assets Not Subject to Amortization [Member]
Intangible assets not subject to amortization	$ 40	$ 40
Developed Technology Rights [Member]
Weighted Average Life (Year)	4 years 4 months 24 days	4 years 4 months 24 days
Weighted Average Remaining Life (Year)	1 year 3 months 18 days	1 year 9 months 18 days
Cost	$ 27,356	$ 27,356
Amortization of intangible assets	(19,268)	(16,152)
Net Book Value	$ 8,088	$ 11,204
Patents [Member]
Weighted Average Life (Year)	14 years	14 years
Weighted Average Remaining Life (Year)	3 years 2 months 12 days	3 years 8 months 12 days
Cost	$ 1,387	$ 1,387
Amortization of intangible assets	(1,071)	(1,021)
Net Book Value	$ 316	$ 366
Noncompete Agreements [Member]
Weighted Average Life (Year)	2 years	2 years
Weighted Average Remaining Life (Year)	1 year 1 month 6 days	1 year 7 months 6 days
Cost	$ 500	$ 500
Amortization of intangible assets	(229)	(104)
Net Book Value	$ 271	$ 396

Note 6 - Intangible Assets, N_5

Note 6 - Intangible Assets, Net - Expected Amortization Expense in Future Periods (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
2021 (remaining six months)	$ 3,290
2022	4,823
2023	350
2024	212
Total expected future amortization expense	$ 8,675	$ 11,966

Note 7 - Leases (Details Textua

Note 7 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Lease, Expense	$ 3.6	$ 4.5	$ 7.2	$ 8.9

Note 7 - Leases - Supplemental

Note 7 - Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash payments included in the measurement of lease liabilities	$ 6,853	$ 5,106
Lease liabilities arising from obtaining right-of-use assets	$ 1,179	$ 7,033

Note 7 - Leases - Weighted Aver

Note 7 - Leases - Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Details)	Jun. 30, 2021	Dec. 31, 2020
Weighted average remaining lease term (years) (Year)	3 years 7 months 6 days	4 years 1 month 6 days
Weighted average discount rate	4.80%	4.80%

Note 9 - Stockholders' Equity_3

Note 9 - Stockholders' Equity and Stock-based Compensation (Details Textual) - USD ($) $ in Millions	Jun. 09, 2021	Apr. 27, 2021	Mar. 19, 2021	Feb. 10, 2021	May 07, 2020	Oct. 30, 2019	Oct. 30, 2018	Feb. 05, 2018	Feb. 28, 2021	Feb. 29, 2020	Jun. 30, 2021
Share-based Payment Arrangement, Accelerated Cost											$ 27.3
Stock Repurchase Program, Authorized Amount				$ 500				$ 100			$ 138.6
Stock Repurchase Program, Period in Force (Year)								2 years
Stock Repurchase Program, Additional Authorized Amount				$ 100	$ 100	$ 100	$ 100
Stock Repurchased and Retired During Period, Shares (in shares)											585,000
Stock Repurchased and Retired During Period, Value											$ 63.2
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total											$ 14.5
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)											2 years 8 months 12 days
Share-based Payment Arrangement, Option [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number (in shares)			348,000
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total											$ 53.8
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)											2 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)											181,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)											389,000
Restricted Stock Units (RSUs) [Member] | Time based Shared Based Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number (in shares)			127,000
Restricted Stock Units (RSUs) [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number (in shares)			44,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)									22,000	15,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period As A Percentage Of Target									200.00%	135.00%
Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		9,671
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Termination Period Trigger (Month)		12 months
Share-Based Compensation, Percentage Of Shares That Will Vest Upon Trigger		100.00%
Maximum [Member] | Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage		200.00%
Minimum [Member] | Performance-based Restricted Stock Units [Member] | President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage		0.00%
The 2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)											1,963,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)											8,572,000
The 2012 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)											17,662,000
The 2000 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)											0
The 2021 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period (Month)	6 months
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%

Note 9 - Stockholders' Equity_4

Note 9 - Stockholders' Equity and Stock-based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock-based compensation	$ 8,553	$ 9,444	$ 46,755	$ 19,441
Cost of Sales [Member]
Stock-based compensation	841	583	1,716	1,197
Research and Development Expense [Member]
Stock-based compensation	2,582	3,253	4,797	6,690
Selling and Marketing Expense [Member]
Stock-based compensation	1,086	1,513	2,714	3,073
General and Administrative Expense [Member]
Stock-based compensation	$ 4,044	$ 4,095	$ 37,528	$ 8,481

Note 9 - Stockholders' Equity_5

Note 9 - Stockholders' Equity and Stock-based Compensation - Share-based Compensation and Stock Options Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021USD ($)$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares
Balance (in shares) | shares	2,215
Weighted average exercise price, balance (in dollars per share) | $ / shares	$ 59.07
Weighted Average Remaining Contractual Life Balance (Year)	5 years 1 month 6 days	6 years 6 months
Aggregate intrinsic value | $	$ 85,821	$ 139,121
Granted (in shares) | shares	205
Weighted average exercise price, granted (in dollars per share) | $ / shares	$ 114.62
Exercised (in shares) | shares	(126)
Weighted average exercise price, exercised (in dollars per share) | $ / shares	$ 35.25
Canceled (in shares) | shares	(62)
Weighted average exercise price, canceled (in dollars per share) | $ / shares	$ 99.91
Balance (in shares) | shares	2,232	2,215
Weighted average exercise price, balance (in dollars per share) | $ / shares	$ 64.37	$ 59.07
Vested and expected to vest (in shares) | shares	2,080
Vested and Expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 61.38
Vested and Expected to vest, weighted average remaining contractual life (Year)	4 years 9 months 18 days
Vested and Expected to vest, aggregate intrinsic value | $	$ 85,211
Exercisable (in shares) | shares	1,641
Exercisable, Weighted average exercise price (in dollars per share) | $ / shares	$ 50.67
Exercisable, weighted average remaining contractual life (Year)	3 years 8 months 12 days
Exercisable, aggregate intrinsic value | $	$ 82,435

Note 9 - Stockholders' Equity_6

Note 9 - Stockholders' Equity and Stock-based Compensation - Share-based Compensation, Restricted Stock and Restricted Stock Units (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Cancelled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 83.01
Expected to vest, number of shares (in shares) | shares	633
Expected to vest, weighted average grant date fair value (in dollars per share) | $ / shares	$ 93.74
Restricted Stock Units (RSUs) [Member]
Balance, number of shares (in shares) | shares	1,047
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 86.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	181
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 112.67
Vested, number of shares (in shares) | shares	(389)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 84.51
Cancelled, number of shares (in shares) | shares	(117)
Balance, number of shares (in shares) | shares	722
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 95.12

Note 10 - Net Income Per Shar_2

Note 10 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income	$ 21,142	$ 228	$ 26,319	$ 18,694	$ 21,370	$ 45,013
Basic weighted average shares (in shares)	39,099		39,161		39,154	39,137
Common stock options (in shares)	831		1,382		851	1,402
Restricted stock units (in shares)	147		376		248	344
Diluted weighted average shares (in shares)	40,077		40,919		40,253	40,883
Basic (in dollars per share)	$ 0.54		$ 0.67		$ 0.55	$ 1.15
Diluted (in dollars per share)	$ 0.53		$ 0.64		$ 0.53	$ 1.10

Note 10 - Net Income Per Shar_3

Note 10 - Net Income Per Share - Anti-dilutive Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive securities (in shares)	828	454	620	551
Share-based Payment Arrangement, Option [Member]
Antidilutive securities (in shares)	675	452	524	517
Restricted Stock Units (RSUs) [Member]
Antidilutive securities (in shares)	153	2	96	34

Note 11 - Income Taxes (Details

Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Expense (Benefit), Total	$ 8,707	$ 775	$ 6,272	$ 4,298
Effective Income Tax Rate Reconciliation, Percent, Total	29.20%	2.90%	22.70%	8.70%
Unrecognized Tax Benefits, Ending Balance	$ 9,400		$ 9,400		$ 8,900
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 4,800		$ 4,800		$ 4,600

Note 12 - Segment Information_3

Note 12 - Segment Information and Information About Geographic Area (Details Textual)	6 Months Ended
	Jun. 30, 2021
Number of Operating Segments	1
Number of Reportable Segments	1

Note 12 - Segment Information_4

Note 12 - Segment Information and Information About Geographic Area - Revenue and Property and Equipment, Net by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenues	$ 99,702	$ 88,830	$ 196,458	$ 175,093
Property and equipment, net	65,959		65,959		$ 64,850
UNITED STATES
Revenues	60,991	57,015	121,123	111,978
Property and equipment, net	45,535		45,535		43,791
INDIA
Property and equipment, net	11,789		11,789		12,465
Non-US [Member]
Revenues	38,711	$ 31,815	75,335	$ 63,115
Other Geographic Areas [Member]
Property and equipment, net	$ 8,635		$ 8,635		$ 8,594