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Fair Value Measurements - Schedule of Fair Value of Company's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total financial assets | $ 54,120 | $ 73,411
Level 1 |  |
Assets |  |
Total financial assets | 23,613 | 10,606
Level 2 |  |
Assets |  |
Total financial assets | 30,507 | 62,805
Money Market Funds |  |
Assets |  |
Total financial assets | 23,613 | 10,606
Money Market Funds | Level 1 |  |
Assets |  |
Total financial assets | 23,613 | 10,606
U.S. Government Securities |  |
Assets |  |
Total financial assets | 3,477 | 9,975
U.S. Government Securities | Level 2 |  |
Assets |  |
Total financial assets | 3,477 | 9,975
Corporate Notes |  |
Assets |  |
Total financial assets | 11,286 | 16,499
Corporate Notes | Level 2 |  |
Assets |  |
Total financial assets | 11,286 | 16,499
Commercial Paper |  |
Assets |  |
Total financial assets | 15,744 | 36,331
Commercial Paper | Level 2 |  |
Assets |  |
Total financial assets | $ 15,744 | $ 36,331

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