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Marketable Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 409,214	$ 149,791
Unrealized Gain	4	120
Unrealized Loss	(264)	(8)
Marketable securities	408,954	149,903
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	374,849	125,823
Unrealized Gain	1	47
Unrealized Loss	(257)	(6)
Marketable securities	374,593	125,864
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,880	4,991
Unrealized Gain	0	0
Unrealized Loss	0	0
Marketable securities	16,880	4,991
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,017	4,294
Unrealized Gain	0	21
Unrealized Loss	0	0
Marketable securities	2,017	4,315
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,468	14,683
Unrealized Gain	3	52
Unrealized Loss	(7)	(2)
Marketable securities	$ 15,464	$ 14,733

X

- 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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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), classified as current.

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