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Fair Value Measurements - Schedule of Derivative liabilities (Details) (10-K) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Disclosures [Abstract] |  |  |  |  |  |
Derivative liabilities beginning balance |  |  |  | $ 23,231,938 | $ 23,231,938 | $ 3,794,153
Change in fair value of derivative liability |  |  |  |  |  | (5,921,409)
Reclassification of derivative liability |  |  |  |  |  | 92,601
Fair value adjustments for warrant liabilities |  | $ (1,485,813) |  | $ 31,687,073 | 39,222,099 | 25,266,593
Conversion of warrant liabilities |  |  |  |  | (51,325,017) |
Cashless warrants exercise |  |  |  |  | (12,277,968) |
Loss on issuance of Series C Convertible Preferred stock |  |  |  |  | 2,809,497 |
Net proceeds from issuance of Series C Convertible Preferred Stock and warrants for cash in an offering |  |  |  |  | 925,115 |
Loss on issuance of Series C-1 Convertible Preferred stock |  |  |  |  | 478,035 |
Net cash proceeds from issuance of Series C-1 Convertible Preferred Stock and warrants for cash and digital currency in an offering |  |  |  |  | 825,005 |
Net digital currency proceeds from issuance of Series C-1 Convertible Preferred Stock and warrants for cash and digital currency in an offering |  |  |  |  | 250,000 |
Reclassification between convertible notes and derivative liabilities |  |  |  |  | (4,138,704) |
Derivative liabilities ending balance |  |  |  |  |  | $ 23,231,938

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