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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