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Note 2 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Cash and Cash Equivalents and Debt Securities, Available-for-sale, Amortized Cost to Fair Value [Table Text Block]

		December 31, 2021
		Amortized Cost				Unrealized Gains				Unrealized Losses				Fair Value
		(in thousands)
Cash and cash equivalents:
Cash		$	61,220			$	—			$	—			$	61,220
Money market funds			75,258				—				—				75,258
Commercial paper			850				—				—				850
Total			137,328				—				—				137,328
Short-term marketable securities:
Commercial paper			28,869				101				(7	)			28,963
Corporate bonds			3,952				—				—				3,952
Asset-backed securities			217,160				2				(163	)			216,999
U.S. Treasury and government agencies			18,046				—				—				18,046
Total			268,027				103				(170	)			267,960
Long-term marketable securities:
Asset-backed securities			14,941				6				(36	)			14,911
U.S. Treasury and government agencies			37,664				—				(136	)			37,528
Foreign government			1,007				12				—				1,019
Corporate bonds			57,762				160				(182	)			57,740
Total			111,374				178				(354	)			111,198
Total		$	516,729			$	281			$	(524	)		$	516,486

		December 31, 2020
		Amortized Cost				Unrealized Gains				Unrealized 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]

		December 31, 2021
		Level 1				Level 2				Fair Value
		(in thousands)
Money market funds		$	75,258			$	—			$	75,258
Commercial paper			—				18,896				18,896
U.S. Treasury and government agencies			—				254,527				254,527
Foreign government			—				1,019				1,019
Corporate bonds			—				86,703				86,703
Asset-backed securities			—				18,863				18,863
Total		$	75,258			$	380,008			$	455,266

		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]

		December 31, 2021
		Mature within One Year				Mature after One Year through Two Years				Mature over Two Years				Fair Value
		(in thousands)
Commercial paper		$	18,896			$	—			$	—			$	18,896
U.S. Treasury and government agencies			216,999				37,528				—				254,527
Foreign government			—				1,019				—				1,019
Corporate bonds			28,964				38,407				19,332				86,703
Asset-backed securities			3,951				7,959				6,953				18,863
Total		$	268,810			$	84,913			$	26,285			$	380,008

Schedule of Derivative Instruments [Table Text Block]

		December 31,
		2021				2020
		(in thousands)
Assets
Foreign currency forward contracts designated as cash flow hedge		$	1,737			$	511
Foreign currency forward contracts not designated as hedging instruments			1,599				27
Total		$	3,336			$	538
Liabilities
Foreign currency forward contracts designated as cash flow hedge		$	(181	)		$	(2,200	)
Foreign currency forward contracts not designated as hedging instruments			(207	)			(1,677	)
Total		$	(388	)		$	(3,877	)

Derivative Instruments, Gain (Loss) [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
		(in thousands)
Net gains (losses) from non-designated forward contracts		$	2,452			$	(1,634	)		$	438
Other foreign currency transactions gains (losses)			(2,749	)			1,894				(792	)
Total foreign exchange gains (losses), net			(297	)			260				(354	)
Other expenses			(276	)			(253	)			(253	)
Other income (expense), net		$	(573	)		$	7			$	(607	)

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