Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes - Reconciliation of Statutory U.S. Federal Income Tax Rate to Company's Effective Tax Rate (Detail)

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Provision for Income Taxes - Reconciliation of Statutory U.S. Federal Income Tax Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]    
Tax, computed at the federal statutory rate 21.00% 34.00%
State taxes, net of federal tax benefit 6.23% 1.28%
Mark to market adjustment on stock warrants   4.06%
Meals, entertainment and other (0.02%) 1.67%
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 (27.25%) (12.61%)
Rate change due to tax law change   (16.89%)
Provision for income taxes (0.04%) 0.01%