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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Total available-for-sale securities |  |  |  |  |
Amortized Cost | $ 95,680 |  | $ 95,680 |  | $ 48,205
Gross Unrealized Gains | 10 |  | 10 |  |
Gross Unrealized Losses | (18) |  | (18) |  | (16)
Estimated Fair Value | 95,672 |  | 95,672 |  | 48,189
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 95,672 |  | 95,672 |  | 45,700
Gross Unrealized Losses | (18) |  | (18) |  | (16)
Investments that had been in a continuous loss position for more than 12 months | 0 |  | 0 |  | 0
Realized gains or losses |  |  |  |  |
Realized gains | 0 | $ 0 | 0 | $ 0 |
Realized losses | 0 | $ 0 | 0 | $ 0 |
U.S. treasuries |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 81,733 |  | 81,733 |  | 37,191
Gross Unrealized Gains | 10 |  | 10 |  |
Gross Unrealized Losses | (16) |  | (16) |  | (7)
Estimated Fair Value | 81,727 |  | 81,727 |  | 37,184
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 81,727 |  | 81,727 |  | 37,184
Gross Unrealized Losses | (16) |  | (16) |  | (7)
Corporate debt |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 5,007 |  | 5,007 |  | 8,525
Gross Unrealized Losses | (1) |  | (1) |  | (9)
Estimated Fair Value | 5,006 |  | 5,006 |  | 8,516
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 5,006 |  | 5,006 |  | 8,516
Gross Unrealized Losses | (1) |  | (1) |  | (9)
Commercial paper |  |  |  |  |
Total available-for-sale securities |  |  |  |  |
Amortized Cost | 8,940 |  | 8,940 |  | 2,489
Gross Unrealized Losses | (1) |  | (1) |  |
Estimated Fair Value | 8,939 |  | 8,939 |  | $ 2,489
Available-for-sale securities in a loss position |  |  |  |  |
Estimated Fair Value | 8,939 |  | 8,939 |  |
Gross Unrealized Losses | $ (1) |  | $ (1) |  |

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