Marketable 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	$ 49,801	$ 24,634
Unrealized Gain	0	17
Unrealized Loss	(9)	0
Estimated Fair Value	49,792	24,651
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,356	5,938
Unrealized Gain	0	17
Unrealized Loss	0	0
Estimated Fair Value	3,356	5,955
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,274	6,994
Unrealized Gain	0	0
Unrealized Loss	(6)	0
Estimated Fair Value	25,268	6,994
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,088	8,791
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	12,088	8,791
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,083	2,911
Unrealized Gain	0	0
Unrealized Loss	(3)	0
Estimated Fair Value	$ 9,080	$ 2,911

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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