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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

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