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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total available-for-sale securities |  |
Amortized Cost | $ 189,791 | $ 115,219
Gross Unrealized Gains | 15 | 38
Gross Unrealized Losses | (35) | (5)
Estimated Fair Value | 189,771 | 115,252
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 52,545 | 28,945
Gross Unrealized Losses | (35) | (5)
Investments that had been in a continuous loss position for more than 12 months | 0 | 0
U.S. treasuries |  |
Total available-for-sale securities |  |
Amortized Cost | 149,206 | 105,096
Gross Unrealized Gains | 14 | 38
Gross Unrealized Losses | (1) | (4)
Estimated Fair Value | 149,219 | 105,130
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 19,991 | 22,943
Gross Unrealized Losses | (1) | (4)
Government agency securities |  |
Total available-for-sale securities |  |
Amortized Cost |  | 1,139
Estimated Fair Value |  | 1,139
Corporate debt |  |
Total available-for-sale securities |  |
Amortized Cost | 32,588 | 6,003
Gross Unrealized Losses | (34) | (1)
Estimated Fair Value | 32,554 | 6,002
Available-for-sale securities in a loss position |  |
Estimated Fair Value | 32,554 | 6,002
Gross Unrealized Losses | (34) | (1)
Commercial paper |  |
Total available-for-sale securities |  |
Amortized Cost | 7,997 | 2,981
Gross Unrealized Gains | 1 |
Estimated Fair Value | $ 7,998 | $ 2,981

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