Income Taxes - Schedule of Reconciliation of Tax Provision with Expected Provision (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Benefit on net loss	$ (1,955,120)	$ (1,385,291)
Nondeductible expenses	11,464	48,375
Rate change adjustment	1,754,830
Valuation allowance (expense)	3,620,363
Other items		25,957
Income tax (reduction) benefit	$ 3,431,536	$ (1,310,959)
Benefit on net loss, percentage	37.60%	37.60%
Nondeductible expenses, percentage	(0.20%)	(1.30%)
Rate change adjustment, percentage	(33.80%)	0.00%
Valuation allowance (expense), percentage	(69.70%)	0.00%
Other items, percentage	0.00%	0.70%
Tax benefit/effective rate, percentage	(66.10%)	37.00%