Investments - Amortized Cost, Gross Unrealized Gains/Losses In Accumulated Other Comprehensive Loss And Fair Value Of Marketable Debt Securities, Available-For-Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Short-term investments:
Amortized Cost	$ 90,365	$ 94,782
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(542)	(87)
Marketable debt securities, available-for-sale — short-term	89,823	94,696
Long-term investments:
Amortized Cost	28,728	55,111
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(665)	(295)
Marketable debt securities, available-for-sale — long-term	28,063	54,816
Corporate debt security
Short-term investments:
Amortized Cost	62,153	71,406
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(338)	(57)
Marketable debt securities, available-for-sale — short-term	61,815	71,349
Long-term investments:
Amortized Cost	24,997	42,703
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(591)	(246)
Marketable debt securities, available-for-sale — long-term	24,406	42,457
U.S. treasuries
Short-term investments:
Amortized Cost	4,966	3,415
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(48)	(7)
Marketable debt securities, available-for-sale — short-term	4,918	3,408
Long-term investments:
Amortized Cost	650	2,201
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9)	(5)
Marketable debt securities, available-for-sale — long-term	641	2,196
Asset-backed security and other
Short-term investments:
Amortized Cost	4,868	2,555
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(47)	(4)
Marketable debt securities, available-for-sale — short-term	4,821	2,551
Long-term investments:
Amortized Cost	3,081	5,438
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(65)	(28)
Marketable debt securities, available-for-sale — long-term	3,016	5,410
Non-U.S. government and supranational bonds
Short-term investments:
Amortized Cost	16,375	16,405
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(109)	(19)
Marketable debt securities, available-for-sale — short-term	16,266	16,387
Long-term investments:
Amortized Cost		3,769
Gross Unrealized Gains		0
Gross Unrealized Losses		(16)
Marketable debt securities, available-for-sale — long-term		3,753
Certificate of deposit
Short-term investments:
Amortized Cost	2,003	1,001
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Marketable debt securities, available-for-sale — short-term	$ 2,003	1,001
Long-term investments:
Amortized Cost		1,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Marketable debt securities, available-for-sale — long-term		$ 1,000