Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
G&A and other operating expenses	$ 828,281	$ 576,170
Payroll and related expenses	89,171	119,723
Sales and use taxes	18,461	30,696
Interest expense	320,048	167,544
Interest expense - related party	161,952	116,671
Total accrued expenses	$ 1,417,913	$ 1,010,804