Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes - Difference Between Income Tax Expense at Federal Statutory Rate and Company's Effective Tax Rate (Detail)

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Provision for Income Taxes - Difference Between Income Tax Expense at Federal Statutory Rate and Company's Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Federal Statutory Rate 34.00% 34.00%
State income tax rate, net of Federal tax benefit 1.28% (0.14%)
Mark to market adjustment on stock warrants 4.06% 1.22%
Meals and entertainment and other 1.67% 1.16%
Debt discount amortization (2.42%)  
Loss on stock warrants issued (3.30%)  
Loss on write-off of deferred debt discount (5.78%)  
Change in valuation allowance (12.61%) (36.22%)
Rate change due to tax law change (16.89%)  
Effective tax rate 0.01% 0.02%