Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Components of Property and Equipment (Detail)

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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Total property and equipment, Gross $ 2,364,000 $ 603,000
Less: Accumulated depreciation (412,000) (269,000)
Total property and equipment, net 1,952,000 334,000
Laboratory Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment, Gross 1,691,000 488,000
Less: Accumulated depreciation (75,000) (44,000)
Total property and equipment, net 162,000 136,000
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total property and equipment, Gross 512,000 48,000
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Total property and equipment, Gross 85,000 32,000
Computer and Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment, Gross $ 76,000 $ 35,000