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Short-term Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 48,312	$ 9,253
Gross Unrealized Gains	14	7
Gross Unrealized Losses	(1)	0
Aggregate Fair Value	48,325	9,260
United States government debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,048	8,989
Gross Unrealized Gains	14	7
Gross Unrealized Losses	(1)	0
Aggregate Fair Value	48,061	8,996
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	264	264
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 264	$ 264

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- 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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