Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Summary of Changes in Fair Value of Warrant Liabilities Measured at Recurring Basis (Details)

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Fair Value Measurement - Summary of Changes in Fair Value of Warrant Liabilities Measured at Recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Derivative liabilities, beginning balance $ 1,583,103 $ 1,350,881
Conversion of derivative liability to equity (42,556,454)
Issuance of warrants 1,395,618 957,115
Change in fair value of derivative liability 43,026,123 (724,893)
Derivative liabilities, ending balance 3,448,390 1,583,103
Warrants payable, beginning balance 155,412 77,761
Accrual of other warrant obligations 14,992 81,603
Change in fair value of warrants payable 983,716 (3,952)
Warrants payable, ending balance $ 1,154,120 $ 155,412