Pro Forma Consolidated Financial Information - Summary of Consolidated Results of Operations on Pro Forma Basis (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition Pro Forma Information [Abstract]
Pro forma revenue	$ 8,921,369	$ 2,211,251
Pro forma operating expenses	(11,713,221)	(5,181,467)
Pro forma net loss attributable to common stockholders	$ (5,445,835)	$ (2,354,451)