Cash, Cash Equivalents and Available for Sale Securities - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 62,102	$ 143,671
Gross Unrealized Gains	0	13
Gross Unrealized Losses	(11)	(10)
Fair Value	62,091	143,674
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,999	54,225
Gross Unrealized Gains	0	8
Gross Unrealized Losses	0	0
Fair Value	8,999	54,233
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,614	79,282
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(8)	(10)
Fair Value	43,606	79,276
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,489	10,164
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(3)	0
Fair Value	$ 9,486	$ 10,165

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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