Note 2 - Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	September 30, 2022
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash	$	46,591	$	—	$	—		$	46,591
Money market funds		147,311		—		—			147,311
Total		193,902		—		—			193,902
Short-term marketable securities:
Corporate bonds		33,249		4		(352	)		32,901
U.S. Treasury and government agencies		159,056		—		(1,576	)		157,480
Foreign government		1,003		—		(6	)		997
Total		193,308		4		(1,934	)		191,378
Long-term marketable securities:
Corporate bonds		35,440		—		(1,122	)		34,318
Asset-backed securities		19,389		—		(188	)		19,201
U.S. Treasury and government agencies		17,977		—		(499	)		17,478
Total		72,806		—		(1,809	)		70,997
Total	$	460,016	$	4	$	(3,743	)	$	456,277

	December 31, 2021
			Unrealized		Unrealized
	Amortized Cost		Gains		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:(1)
Commercial paper		18,046		—		—			18,046
Corporate bonds		28,869		101		(7	)		28,963
Asset-backed securities		3,952		—		—			3,952
U.S. Treasury and government agencies		217,160		2		(163	)		216,999
Total		268,027		103		(170	)		267,960
Long-term marketable securities:
Corporate bonds		57,762		160		(182	)		57,740
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
Total		111,374		178		(354	)		111,198
Total	$	516,729	$	281	$	(524	)	$	516,486

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	September 30, 2022
	Level 1		Level 2		Fair Value
	(in thousands)
Money market funds	$	147,311	$	—	$	147,311
Corporate bonds		—		67,219		67,219
Asset-backed securities		—		19,201		19,201
U.S. Treasury and government agencies		—		174,958		174,958
Foreign government		—		997		997
Total	$	147,311	$	262,375	$	409,686

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

Investments Classified by Contractual Maturity Date [Table Text Block]

	September 30, 2022
	Mature within		Mature after One Year		Mature over
	One Year		through Two Years		Two Years		Fair Value
	(in thousands)
Corporate bonds	$	32,901	$	31,706	$	2,612	$	67,219
Asset-backed securities		—		9,799		9,402		19,201
U.S. Treasury and government agencies		157,480		17,478		—		174,958
Foreign government		997		—		—		997
Total	$	191,378	$	58,983	$	12,014	$	262,375

Schedule of Derivative Instruments [Table Text Block]

	September 30,			December 31,
	2022			2021
Assets	(in thousands)
Foreign currency forward contracts designated as cash flow hedge	$	4,898		$	1,737
Foreign currency forward contracts not designated as hedging instruments		8,276			1,599
Total	$	13,174		$	3,336
Liabilities
Foreign currency forward contracts designated as cash flow hedge	$	(1,942	)	$	(181	)
Foreign currency forward contracts not designated as hedging instruments		(1,067	)		(207	)
Total	$	(3,009	)	$	(388	)

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2022			2021			2022			2021
	(in thousands)						(in thousands)
Net gains from non-designated forward contracts	$	3,608		$	748		$	8,573		$	1,792
Other foreign currency transaction gains (losses)		(4,518	)		(1,132	)		(11,856	)		(2,360	)
Total foreign exchange losses, net		(910	)		(384	)		(3,283	)		(568	)
Other expenses		(166	)		(67	)		(213	)		(207	)
Other expense, net	$	(1,076	)	$	(451	)	$	(3,496	)	$	(775	)