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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Total available-for-sale securities |  |  |
Amortized Cost |  | $ 161,568 | $ 115,219
Gross Unrealized Gains |  | 30 | 38
Gross Unrealized Losses |  | (13) | (5)
Estimated Fair Value |  | 161,585 | 115,252
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value |  | 56,301 | 28,945
Gross Unrealized Losses |  | (13) | (5)
Investments that had been in a continuous loss position for more than 12 months |  | 0 | 0
Realized gains or losses |  |  |
Realized gains | $ 0 |  |
Realized losses | $ 0 |  |
U.S. treasuries |  |  |
Total available-for-sale securities |  |  |
Amortized Cost |  | 125,333 | 105,096
Gross Unrealized Gains |  | 17 | 38
Gross Unrealized Losses |  | (4) | (4)
Estimated Fair Value |  | 125,346 | 105,130
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value |  | 40,111 | 22,943
Gross Unrealized Losses |  | (4) | (4)
Government agency securities |  |  |
Total available-for-sale securities |  |  |
Amortized Cost |  | 5,995 | 1,139
Gross Unrealized Gains |  | 5 |
Estimated Fair Value |  | 6,000 | 1,139
Corporate debt |  |  |
Total available-for-sale securities |  |  |
Amortized Cost |  | 14,254 | 6,003
Gross Unrealized Gains |  | 1 |
Gross Unrealized Losses |  | (7) | (1)
Estimated Fair Value |  | 14,248 | 6,002
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value |  | 10,195 | 6,002
Gross Unrealized Losses |  | (7) | (1)
Commercial paper |  |  |
Total available-for-sale securities |  |  |
Amortized Cost |  | 15,986 | 2,981
Gross Unrealized Gains |  | 7 |
Gross Unrealized Losses |  | (2) |
Estimated Fair Value |  | 15,991 | $ 2,981
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value |  | 5,995 |
Gross Unrealized Losses |  | $ (2) |

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