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Summary of Significant Accounting Policies - Schedule of Depreciation and Amortization using Straight-line Method over Estimated Useful Lives of Assets (Detail)
12 Months Ended
Dec. 31, 2016
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Lives Shorter of the remaining lease term or useful life
Minimum [Member] | Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Lives 3 years
Minimum [Member] | Laboratory Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Lives 3 years
Maximum [Member] | Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Lives 5 years
Maximum [Member] | Laboratory Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Lives 5 years