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Note 10 - Stockholders' Equity and Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
		(in thousands)
Cost of revenues		$	3,782			$	2,767			$	2,262
Research and development			10,750				13,502				11,151
Sales and marketing			6,323				5,785				4,984
General and administrative			46,724				17,981				16,495
Total stock-based compensation		$	67,579			$	40,035			$	34,892

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
Expected term (in years)			5.2 to 5.5				4.5 to 5.5				4.4 to 6.6
Volatility			38% to 41	%			38% to 43	%			40% to 46	%
Risk-free interest rate			0.5% to 1.2	%			0.3% to 1.4	%			1.5% to 2.4	%
Dividend yield			—				—				—

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Outstanding Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life				Aggregate Intrinsic Value
		(in thousands)								(Years)				(in thousands)
Balance as of December 31, 2020			2,215			$	59.07				6.5			$	139,121
Granted			495			$	112.43
Exercised			(725	)(1)		$	68.91
Canceled			(147	)		$	102.92
Balance as of December 31, 2021			1,838			$	66.05				6.0			$	130,791
Vested and expected to vest - December 31, 2021			1,659			$	61.43				5.7			$	125,769
Exercisable - December 31, 2021			1,168			$	42.60				4.3			$	110,495

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

		Outstanding RSUs				Weighted Average Grant Date Fair Value
		(in thousands)
Balance as of December 31, 2020			1,047			$	86.78
Granted			583	(1)		$	114.59
Vested			(530	)(2)		$	84.97
Canceled			(183	)		$	90.42
Balance as of December 31, 2021			917	(3)		$	104.78
Outstanding and expected to vest - December 31, 2021			815			$	104.22

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

		Year Ended December 31,
		2021
Expected term (in years)			0.5
Volatility			34	%
Risk-free interest rate			0.1	%
Dividend yield			—

Share Repurchase Program [Table Text Block]

Announcement Date		Authorized Dollar Value
		(in millions)
February 12, 2018		$	100.0
October 30, 2018			100.0
October 30, 2019			100.0
May 7, 2020			100.0
February 10, 2021			100.0
November 3, 2021			200.0
Total as of December 31, 2021		$	700.0

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