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Fair Value Measurements - Summary of Investments Classified as Available-For-Sale (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 91,957 $ 138,832
Gross Unrealized Gains 72 222
Gross Unrealized Losses (7) (9)
Fair Value $ 92,022 $ 139,045
Minimum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity 1 month 3 months
Maximum    
Debt Securities, Available-for-sale [Line Items]    
Remaining maturity 19 months 2 years
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 32,984 $ 36,880
Gross Unrealized Gains 3 99
Gross Unrealized Losses 0 0
Fair Value 32,987 36,979
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 32,252 19,965
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Fair Value 32,252 19,966
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 20,287 60,803
Gross Unrealized Gains 69 77
Gross Unrealized Losses (7) (2)
Fair Value 20,349 60,878
Agency bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,998 12,198
Gross Unrealized Gains 0 44
Gross Unrealized Losses 0 0
Fair Value 3,998 12,242
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,436 8,986
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 (7)
Fair Value $ 2,436 $ 8,980