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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost $ 113,115 $ 148,941
Gross Unrealized Gains 21 35
Gross Unrealized Losses (7) (13)
Fair Value $ 113,129 $ 148,963
Minimum    
Debt and Equity Securities, FV-NI [Line Items]    
Remaining maturity 1 month 1 month
Maximum    
Debt and Equity Securities, FV-NI [Line Items]    
Remaining maturity 13 months 19 months
U.S. Government Agencies    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost $ 55,388 $ 83,596
Gross Unrealized Gains 5 3
Gross Unrealized Losses 0 (12)
Fair Value 55,393 83,587
Commercial Paper    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 27,676 34,766
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 27,676 34,766
Corporate Bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 27,648 24,162
Gross Unrealized Gains 16 31
Gross Unrealized Losses (7) (1)
Fair Value 27,657 24,192
Agency Bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost   3,998
Gross Unrealized Gains   1
Gross Unrealized Losses   0
Fair Value   3,999
Asset-backed Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Amortized Cost 2,403 2,419
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 2,403 $ 2,419