Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Summary of Property and Equipment (Detail)

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Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 4,689,137 $ 4,449,442
Accumulated depreciation (2,424,660) (2,286,671)
Property and equipment, net 2,264,477 2,162,771
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 3,869,154 3,701,517
Office and Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 499,233 443,562
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 320,750 $ 304,363