Furniture and Equipment - Summary of Components of Furniture and Equipment (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Furniture and equipment	$ 409,580	$ 443,068
Accumulated depreciation	(311,131)	(335,845)
Furniture and equipment, net	98,449	107,223
Furniture [Member]
Property, Plant and Equipment [Line Items]
Furniture and equipment	156,928	156,928
Computers [Member]
Property, Plant and Equipment [Line Items]
Furniture and equipment	75,716	109,204
Equipment [Member]
Property, Plant and Equipment [Line Items]
Furniture and equipment	141,067	141,067
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Furniture and equipment	$ 35,869	$ 35,869