Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Tax Computed at the Statutory Federal Rate (Detail)

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Income Taxes - Reconciliation of Tax Computed at the Statutory Federal Rate (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Income tax benefit computed at statutory federal rate of 34% $ (2,288,791) $ (2,384,532)
State income tax benefits, net of federal expense/benefit (244,362) (254,584)
Change in valuation allowance (10,055,163) 2,587,731
Effect of new tax rate 12,461,939  
Non-deductible expenses 126,377 185,607
Other   (134,222)
Total provision for income taxes $ 0 $ 0