Investments - Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Cash and cash equivalents:
Amortized Cost	$ 56,441	$ 37,187
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair Value	56,441	37,187
Investments:
Amortized Cost	143,222	102,740
Gross unrealized gains	0	0
Gross unrealized losses	(430)	(126)
Fair Value	142,792	102,614
Total cash, cash equivalents and investments, Amortized Cost	199,663	139,927
Total cash, cash equivalents and investments, Gross Unrealized Gains	0	0
Total cash, cash equivalents and investments, Gross Unrealized Losses	(430)	(126)
Total cash, cash equivalents and investments, Fair Value	199,233	139,801
Cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	56,441	37,187
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair Value	56,441	37,187
Certificates of deposit (due within 1 year)
Investments:
Amortized Cost	9,044	9,047
Gross unrealized gains	0	0
Gross unrealized losses	(14)	(9)
Fair Value	9,030	9,038
Commercial paper (due within 1 year)
Investments:
Amortized Cost	54,456	50,975
Gross unrealized gains	0	0
Gross unrealized losses	(186)	(55)
Fair Value	54,270	50,920
Corporate bonds (due within 1 year)
Investments:
Amortized Cost	41,747	42,718
Gross unrealized gains	0	0
Gross unrealized losses	(178)	(62)
Fair Value	41,569	$ 42,656
Corporate bonds (due within 2 years)
Investments:
Amortized Cost	4,020
Gross unrealized gains	0
Gross unrealized losses	(35)
Fair Value	3,985
U.S. Government and government agencies (due within 1 year)
Investments:
Amortized Cost	33,955
Gross unrealized gains	0
Gross unrealized losses	(17)
Fair Value	$ 33,938