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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
Dec. 31, 2019
Dec. 31, 2018
Assets    
Total assets $ 147,017 $ 142,389
Liabilities    
Total liabilities 21,808  
Money Market Funds    
Assets    
Total assets 27,854 44,002
U.S. Treasuries    
Assets    
Total assets 6,517 14,724
U.S. Government Agency Securities    
Assets    
Total assets 51,273 42,372
Corporate Debt Securities    
Assets    
Total assets 61,373 41,291
Warrant Liability    
Liabilities    
Total liabilities 14,860  
Sublicense Liability    
Liabilities    
Total liabilities 6,948 6,320
Fair Value, Inputs, Level 1    
Assets    
Total assets 27,854 44,002
Fair Value, Inputs, Level 1 | Money Market Funds    
Assets    
Total assets 27,854 44,002
Fair Value, Inputs, Level 2    
Assets    
Total assets 119,163 98,387
Fair Value, Inputs, Level 2 | U.S. Treasuries    
Assets    
Total assets 6,517 14,724
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities    
Assets    
Total assets 51,273 42,372
Fair Value, Inputs, Level 2 | Corporate Debt Securities    
Assets    
Total assets 61,373 41,291
Fair Value, Inputs, Level 3    
Liabilities    
Total liabilities 21,808  
Fair Value, Inputs, Level 3 | Warrant Liability    
Liabilities    
Total liabilities 14,860  
Fair Value, Inputs, Level 3 | Sublicense Liability    
Liabilities    
Total liabilities $ 6,948 $ 6,320