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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