Marketable Securities - Schedule of Carrying Amounts and Fair Values of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 142,990	$ 138,747
Unrealized Gains	20	416
Unrealized Losses	(40)	(5)
Fair Value	142,970	139,158
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97,587	50,087
Unrealized Gains	14	136
Unrealized Losses	(6)	0
Fair Value	97,595	50,223
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,403	85,413
Unrealized Gains	6	265
Unrealized Losses	(34)	(5)
Fair Value	$ 45,375	85,673
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,247
Unrealized Gains		15
Unrealized Losses		0
Fair Value		$ 3,262

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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