Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current tax benefit
Federal	$ (1,690,948)	$ (1,402,230)
State	(220,735)	(81,611)
Total current tax benefit	(1,911,683)	(1,483,841)
Deferred tax expense	(31,974)	172,882
Rate change adjustment	1,754,830
Valuation allowance (expense)	3,620,363
Income tax (reduction) benefit	$ 3,431,536	$ (1,310,959)