Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 624,123	$ 605,241
Less accumulated depreciation and amortization	(395,718)	(343,795)
Total	228,405	261,446
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	333,670	333,670
Computer equipment and office equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	138,236	119,354
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 152,217	$ 152,217