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Fair Value Measurements - Schedule of Cash Equivalents and Marketable Securities Classified as Available-for-Sale Securities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 209,162	$ 107,873
Unrealized Gains	17	53
Unrealized Losses	(24)	(1)
Fair Value	209,155	107,925
Level 1 | Money Market Funds | Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	58,368	21,333
Fair Value	58,368	21,333
Level 2 | Corporate Debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	78,478	32,164
Unrealized Gains	10	48
Unrealized Losses	(24)
Fair Value	78,464	32,212
Level 2 | Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		12,367
Unrealized Gains		2
Unrealized Losses		(1)
Fair Value		12,368
Level 2 | Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	53,539	28,962
Fair Value	53,539	28,962
Level 2 | U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	18,777	13,047
Unrealized Gains	7	3
Fair Value	$ 18,784	$ 13,050

X

- Definition

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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