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Marketable Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 454,765 $ 455,004
Unrealized Gain 0 3
Unrealized Loss (9,892) (2,132)
Marketable securities 444,873 452,875
U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 420,162 420,392
Unrealized Gain 0 0
Unrealized Loss (9,713) (2,107)
Marketable securities 410,449 418,285
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 18,972 13,878
Unrealized Gain 0 0
Unrealized Loss 0 0
Marketable securities 18,972 13,878
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   2,003
Unrealized Gain   0
Unrealized Loss   (1)
Marketable securities   2,002
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 15,631 18,731
Unrealized Gain 0 3
Unrealized Loss (179) (24)
Marketable securities $ 15,452 $ 18,710