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Shareholders' Equity - Summary of Warrant Activity (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Number of Warrants Outstanding Beginning Balance 268,788,733 486,723
Number of Warrants Ratchet warrants issued due to price reset 7,454,050 271,641,648
Number of Warrants Cashless warrant exercise (111,244,318) (3,270,888)
Number of Warrants exercise for cash   (68,750)
Number of Warrants Issuance of Series C Convertible Preferred Stock and warrants for cash in an offering 47,302,176  
Number of Warrants Issuance of Series C-1 Convertible Preferred Stock and warrants for cash and digital currency in an offering 12,942,000  
Number of Warrants Issuance of Series B Convertible Preferred Stock in exchange for convertible notes payable and warrants (163,178,007)  
Number of Warrants Outstanding Ending Balance 62,064,634 268,788,733