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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

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