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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Warrant Activity

The following is a summary of warrant activity for the year ended December 31, 2017 and 2016:

 

    Number
of Warrants		  
Outstanding as of December 31, 2015     486,723  
Ratchet warrants issued due to price reset     271,641,648  
Cashless warrant exercise     (3,270,888 )
Warrants exercise for cash     (68,750 )
Outstanding as of December 31, 2016     268,788,733  
Issuance of Series C Convertible Preferred Stock and warrants for cash in an offering     47,302,176  
Issuance of Series C-1 Convertible Preferred Stock and warrants for cash and digital currency in an offering     12,942,000  
Issuance of Series B Convertible Preferred Stock in exchange for convertible notes payable and warrants     (163,178,007 )
Ratchet warrants issued due to price reset     7,454,050  
Cashless warrant exercise     (111,244,318 )
Outstanding as of December 31, 2017     62,064,634