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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 | Sep. 30, 2018 | Dec. 31, 2017
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Financial Assets |  |
Financial assets, fair value | $ 63,003 | $ 46,406
U.S. treasury securities |  |
Financial Assets |  |
Financial assets, fair value |  | 1,501
Commercial paper |  |
Financial Assets |  |
Financial assets, fair value | 32,230 |
Money market funds |  |
Financial Assets |  |
Financial assets, fair value | 6,550 | 1,674
Reverse repurchase agreements |  |
Financial Assets |  |
Financial assets, fair value | 6,250 | 7,250
U.S. government securities |  |
Financial Assets |  |
Financial assets, fair value | 17,973 | 35,981
Level 1 |  |
Financial Assets |  |
Financial assets, fair value | 6,550 | 3,175
Level 1 | U.S. treasury securities |  |
Financial Assets |  |
Financial assets, fair value |  | 1,501
Level 1 | Money market funds |  |
Financial Assets |  |
Financial assets, fair value | 6,550 | 1,674
Level 2 |  |
Financial Assets |  |
Financial assets, fair value | 56,453 | 43,231
Level 2 | Commercial paper |  |
Financial Assets |  |
Financial assets, fair value | 32,230 |
Level 2 | Reverse repurchase agreements |  |
Financial Assets |  |
Financial assets, fair value | 6,250 | 7,250
Level 2 | U.S. government securities |  |
Financial Assets |  |
Financial assets, fair value | $ 17,973 | $ 35,981

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