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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 10,248 $ 10,427
Less: accumulated depreciation (10,113) (10,286)
Property and equipment, net 135 141
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 233 266
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 4,536 4,561
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 5,383 5,504
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 96 $ 96