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Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost $ 148,941 $ 138,832
Gross Unrealized Gains 35 222
Gross Unrealized Losses (13) (9)
Fair Value $ 148,963 $ 139,045
Minimum    
Debt and Equity Securities, FV-NI [Line Items]    
Remaining maturity 1 month 3 months
Maximum    
Debt and Equity Securities, FV-NI [Line Items]    
Remaining maturity 16 months 2 years
U.S. Government Agencies    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost $ 83,596 $ 36,880
Gross Unrealized Gains 3 99
Gross Unrealized Losses (12) 0
Fair Value 83,587 36,979
Corporate Bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 24,162 60,803
Gross Unrealized Gains 31 77
Gross Unrealized Losses (1) (2)
Fair Value 24,192 60,878
Commercial Paper    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 34,766 19,965
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Fair Value 34,766 19,966
Agency Bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 3,998 12,198
Gross Unrealized Gains 1 44
Gross Unrealized Losses 0 0
Fair Value 3,999 12,242
Asset-backed Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 2,419 8,986
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 (7)
Fair Value $ 2,419 $ 8,980