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v3.19.2

Liquidity and Financial Condition (Details) - USD ($) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Jan. 28, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Cash and cash equivalents | $ 16,110,630 | $ 1,654,034 |  |  | $ 225,390 |  | $ 41,651,965
Digital currencies | 1,900,000 |  |  |  |  |  |
Working capital | 14,600,000 |  |  |  |  |  |
Stockholders' equity | (26,137,560) | (20,667,244) | $ 8,769,373 |  | (4,491,012) | $ (43,235,055) | $ (49,627,399)
Accumulated deficit | 212,006,522 |  |  |  | $ 197,199,197 |  |
Total investment | 3,000,000 |  |  |  |  |  |
Proceeds from the sale of stock | 19,671,712 |  |  |  |  |  |
Common Stock [Member] | H.C. Wainwright [Member] |  |  |  |  |  |  |
Maximum amount of sales shares | 100,000,000 |  |  |  |  |  |
Proceeds from the sale of stock | $ 18,900,000 |  |  |  |  |  |
Percentage of commission | 3.00% |  |  |  |  |  |
Weighted average price | $ 3.26 |  |  |  |  |  |
Senior Secured Convertible Promissory Notes [Member] | Investors [Member] |  |  |  |  |  |  |
Debt instrument face amount | $ 3,358,333 |  |  | $ 3,358,333 |  |  |

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