Marketable Debt Securities - Schedule of Marketable Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 10,260	$ 62,358
Unrealized Losses		(7)
Unrealized Gains	24	30
Fair Value	10,284	62,381
Asset Backed Securities
Marketable Securities [Line Items]
Amortized Cost	7,507	19,589
Unrealized Losses		(1)
Unrealized Gains	15	10
Fair Value	7,522	19,598
Corporate Debt Securities
Marketable Securities [Line Items]
Amortized Cost	1,754	19,387
Unrealized Losses		(3)
Unrealized Gains	8	9
Fair Value	1,762	19,393
Commercial Paper
Marketable Securities [Line Items]
Amortized Cost	999	17,882
Unrealized Gains	1	11
Fair Value	$ 1,000	17,893
US Government Agency Bonds
Marketable Securities [Line Items]
Amortized Cost		5,500
Unrealized Losses		(3)
Fair Value		$ 5,497

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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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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