Short-Term Investments - Summary of Short-Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 71,782	$ 39,942
Unrealized Gains	5	42
Unrealized Losses	(4)	(1)
Estimated Fair Value	71,783	39,983
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	27,136	9,680
Unrealized Gains		14
Estimated Fair Value	27,136	9,694
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	26,510	24,762
Unrealized Gains		20
Unrealized Losses	(4)	(1)
Estimated Fair Value	26,506	24,781
U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	18,136
Unrealized Gains	5
Estimated Fair Value	$ 18,141
Asset Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		5,500
Unrealized Gains		8
Estimated Fair Value		$ 5,508

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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