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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total assets | $ 171,381 | $ 142,389
Liabilities |  |
Total liabilities | 14,385 |
Money Market Funds |  |
Assets |  |
Total assets | 33,732 | 44,002
U.S. Treasuries |  |
Assets |  |
Total assets | 1,497 | 14,724
U.S. Government Agency Securities |  |
Assets |  |
Total assets | 58,719 | 42,372
Corporate Debt Securities |  |
Assets |  |
Total assets | 77,433 | 41,291
Warrant Liability |  |
Liabilities |  |
Total liabilities | 7,594 |
Sublicense Liability |  |
Liabilities |  |
Total liabilities | 6,791 | 6,320
Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 33,732 | 44,002
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Assets |  |
Total assets | 33,732 | 44,002
Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 137,649 | 98,387
Fair Value, Inputs, Level 2 | U.S. Treasuries |  |
Assets |  |
Total assets | 1,497 | 14,724
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities |  |
Assets |  |
Total assets | 58,719 | 42,372
Fair Value, Inputs, Level 2 | Corporate Debt Securities |  |
Assets |  |
Total assets | 77,433 | 41,291
Fair Value, Inputs, Level 3 |  |
Liabilities |  |
Total liabilities | 14,385 |
Fair Value, Inputs, Level 3 | Warrant Liability |  |
Liabilities |  |
Total liabilities | 7,594 |
Fair Value, Inputs, Level 3 | Sublicense Liability |  |
Liabilities |  |
Total liabilities | $ 6,791 | $ 6,320

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