Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,450,547	$ 1,554,944
Less accumulated depreciation and amortization	(1,107,746)	(951,798)
Property and equipment, net	1,342,802	603,146
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	121,491	61,121
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	926,590	1,001,810
Computers and Telecommunications [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	149,290	81,342
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	25,069	16,244
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 1,228,108	44,352
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		$ 350,075