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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Financial Assets |  |
Financial assets, fair value | $ 100,298 | $ 71,458
Money market funds |  |
Financial Assets |  |
Financial assets, fair value | 5,947 | 7,180
Reverse repurchase agreements |  |
Financial Assets |  |
Financial assets, fair value | 6,250 | 6,250
Commercial paper |  |
Financial Assets |  |
Financial assets, fair value | 49,435 | 53,916
Level 1 |  |
Financial Assets |  |
Financial assets, fair value | 5,947 | 7,180
Level 1 | Money market funds |  |
Financial Assets |  |
Financial assets, fair value | 5,947 | 7,180
Level 2 |  |
Financial Assets |  |
Financial assets, fair value | 94,351 | 64,278
Level 2 | Reverse repurchase agreements |  |
Financial Assets |  |
Financial assets, fair value | 6,250 | 6,250
Level 2 | Commercial paper |  |
Financial Assets |  |
Financial assets, fair value | 49,435 | 53,916
U.S. government securities |  |
Financial Assets |  |
Financial assets, fair value | 38,666 | 4,112
U.S. government securities | Level 2 |  |
Financial Assets |  |
Financial assets, fair value | $ 38,666 | $ 4,112

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