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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
Jun. 30, 2020
Dec. 31, 2019
Assets    
Total assets $ 192,973 $ 147,017
Liabilities    
Total liabilities   21,808
Money Market Funds    
Assets    
Total assets 24,187 27,854
U.S. Treasuries    
Assets    
Total assets 22,222 6,517
U.S. Government Agency Securities    
Assets    
Total assets 54,405 51,273
Corporate Debt Securities    
Assets    
Total assets 92,159 61,373
Warrant Liability    
Liabilities    
Total liabilities 31,905 14,860
Sublicense Liability    
Liabilities    
Total liabilities   6,948
Fair Value, Inputs, Level 1    
Assets    
Total assets 24,187 27,854
Fair Value, Inputs, Level 1 | Money Market Funds    
Assets    
Total assets 24,187 27,854
Fair Value, Inputs, Level 2    
Assets    
Total assets 168,786 119,163
Fair Value, Inputs, Level 2 | U.S. Treasuries    
Assets    
Total assets 22,222 6,517
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities    
Assets    
Total assets 54,405 51,273
Fair Value, Inputs, Level 2 | Corporate Debt Securities    
Assets    
Total assets 92,159 61,373
Fair Value, Inputs, Level 3    
Liabilities    
Total liabilities   21,808
Fair Value, Inputs, Level 3 | Warrant Liability    
Liabilities    
Total liabilities $ 31,905 14,860
Fair Value, Inputs, Level 3 | Sublicense Liability    
Liabilities    
Total liabilities   $ 6,948