Note 3 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Cost of revenue	$	1,020	$	1,186	$	3,317	$	3,691
Research and development (“R&D”)		8,479		9,287		26,406		26,875
Selling, general and administrative (“SG&A”)		24,103		32,524		78,880		95,157
Total stock-based compensation expense	$	33,602	$	42,997	$	108,603	$	125,723
Tax benefit related to stock-based compensation (1)	$	667	$	654	$	1,753	$	1,879

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

	Time-Based RSUs					PSUs and MPSUs						MSUs					Total
				Weighted-						Weighted-					Weighted-					Weighted-
				Average						Average					Average					Average
				Grant Date						Grant Date					Grant Date					Grant Date
	Number of			Fair Value		Number of				Fair Value		Number of			Fair Value		Number of			Fair Value
	Shares			Per Share		Shares				Per Share		Shares			Per Share		Shares			Per Share
Outstanding at January 1, 2023		106		$	327.13		748			$	275.70		1,805		$	126.57		2,659		$	176.50
Granted		45		$	479.76		226		(1)	$	449.34		31		$	330.95		302		$	445.50
Vested		(42	)	$	288.51		(504	)		$	257.41		(240	)	$	23.57		(786	)	$	187.56
Forfeited		(5	)	$	376.82		(4	)		$	312.12		(14	)	$	104.16		(23	)	$	192.23
Outstanding at September 30, 2023		104		$	406.52		466			$	380.12		1,582		$	146.51		2,152		$	209.67

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2023			2022			2023			2022
Expected term (in years)		0.5			0.5			0.5			0.5
Expected volatility		50.8	%		63.2	%		53.3	%		50.6	%
Risk-free interest rate		5.5	%		3.1	%		5.3	%		1.9	%
Dividend yield		0.8	%		0.6	%		0.8	%		0.6	%