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Stockholders' Equity (Tables) | 12 Months Ended
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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 |

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