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Property and Equipment, net - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 2,552 $ 2,510
Less accumulated depreciation and amortization (2,247) (2,116)
Property and equipment - net 305 394
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 1,538 1,529
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 216 185
Office Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 217 217
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 581 $ 579