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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Total available-for-sale securities |  |  |
Amortized Cost | $ 112,191 |  | $ 115,219
Gross Unrealized Gains | 96 |  | 38
Gross Unrealized Losses | (8) |  | (5)
Estimated Fair Value | 112,279 |  | 115,252
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 59,360 |  | 28,945
Gross Unrealized Losses | (8) |  | (5)
Investments that had been in a continuous loss position for more than 12 months | 0 |  | 0
Realized gains or losses |  |  |
Realized gains | 0 | $ 0 |
Realized losses | 0 | $ 0 |
U.S. treasuries |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 77,692 |  | 105,096
Gross Unrealized Gains | 58 |  | 38
Gross Unrealized Losses | (4) |  | (4)
Estimated Fair Value | 77,746 |  | 105,130
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 55,320 |  | 22,943
Gross Unrealized Losses | (4) |  | (4)
Government agency securities |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 5,971 |  | 1,139
Gross Unrealized Gains | 24 |  |
Estimated Fair Value | 5,995 |  | 1,139
Corporate debt |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 12,069 |  | 6,003
Gross Unrealized Gains | 13 |  |
Gross Unrealized Losses | (4) |  | (1)
Estimated Fair Value | 12,078 |  | 6,002
Available-for-sale securities in a loss position |  |  |
Estimated Fair Value | 4,040 |  | 6,002
Gross Unrealized Losses | (4) |  | (1)
Commercial paper |  |  |
Total available-for-sale securities |  |  |
Amortized Cost | 16,459 |  | 2,981
Gross Unrealized Gains | 1 |  |
Estimated Fair Value | $ 16,460 |  | $ 2,981

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