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Fair Value Measurements - Summary of Fair Value Measurements of Company's Financial Assets and Liabilities (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Assets at fair value | $ 209,799 | $ 128,094
Liabilities |  |
Derivative liability | 546 |
Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 76,071 | 72,644
Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 133,728 | 55,450
Money Market Funds [Member] |  |
Assets: |  |
Assets at fair value | 67,611 | 68,651
Money Market Funds [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 67,611 | 68,651
U.S. Treasury Securities [Member] |  |
Assets: |  |
Assets at fair value | 8,460 | 3,993
U.S. Treasury Securities [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 8,460 | 3,993
Corporate Bonds [Member] |  |
Assets: |  |
Assets at fair value | 41,421 | 26,827
Corporate Bonds [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 41,421 | 26,827
Commercial Paper [Member] |  |
Assets: |  |
Assets at fair value | 83,184 | 20,420
Commercial Paper [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 83,184 | 20,420
Asset-Backed Securities [Member] |  |
Assets: |  |
Assets at fair value | 9,123 | 8,203
Asset-Backed Securities [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | $ 9,123 | $ 8,203

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