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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Assets at fair value | $ 183,619 | $ 128,094
Liabilities: |  |
Derivative liability | 602 |
Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 74,192 | 72,644
Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 109,427 | 55,450
Liabilities: |  |
Derivative liability | 46 |
Level 3 [Member] |  |
Liabilities: |  |
Derivative liability | 556 |
Derivative Liability Exit Fee [Member] |  |
Liabilities: |  |
Derivative liability | 556 |
Derivative Liability Exit Fee [Member] | Level 3 [Member] |  |
Liabilities: |  |
Derivative liability | 556 |
Foreign Exchange Contract [Member] |  |
Liabilities: |  |
Derivative liability | 46 |
Foreign Exchange Contract [Member] | Level 2 [Member] |  |
Liabilities: |  |
Derivative liability | 46 |
Money Market Funds [Member] |  |
Assets: |  |
Assets at fair value | 66,235 | 68,651
Money Market Funds [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 66,235 | 68,651
U.S. Treasury Securities [Member] |  |
Assets: |  |
Assets at fair value | 7,957 | 3,993
U.S. Treasury Securities [Member] | Level 1 [Member] |  |
Assets: |  |
Assets at fair value | 7,957 | 3,993
Corporate Bonds [Member] |  |
Assets: |  |
Assets at fair value | 36,439 | 26,827
Corporate Bonds [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 36,439 | 26,827
Commercial Paper [Member] |  |
Assets: |  |
Assets at fair value | 65,105 | 20,420
Commercial Paper [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | 65,105 | 20,420
Asset-Backed Securities [Member] |  |
Assets: |  |
Assets at fair value | 7,883 | 8,203
Asset-Backed Securities [Member] | Level 2 [Member] |  |
Assets: |  |
Assets at fair value | $ 7,883 | $ 8,203

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