Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)

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Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Tax benefit at federal statutory rate (21.00%) (34.00%)
State income taxes, net of federal benefit (5.00%) (4.00%)
Permanent differences:    
Derivative liabilities 22.90% 22.20%
Other (3.50%) 4.40%
Tax credits (1.40%) 0.00%
Change in effective rate 0.00% 16.70%
Change in valuation allowance 8.00% (5.30%)
Effective income tax rate 0.00% 0.00%