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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares |  | 12 Months Ended
--- | --- | ---
Aug. 03, 2018 | Dec. 31, 2018
Number of Shares, Exercisable at end of year |  | 3,949,018
Common Stock Financing Warrant [Member] |  |
Number of Shares, outstanding, at beginning of year |  | 1,289,172
Number of Shares, Issued |  | 2,861,558
Number of Shares, Exercised |  | (842,117)
Number of Shares, Issued as result of the reset provision on August 3, 2018 | 640,405 |
Number of Shares, outstanding at end of year |  | 3,949,018
Number of Shares, Exercisable at end of year |  | 3,949,018
Weighted Average Exercise Price, outstanding, at beginning of year |  | $ 0.29
Weighted Average Exercise Price, Issued |  | 1.17
Weighted Average Exercise Price, Exercised |  | 0.20
Weighted Average Exercise Prices, Issued as result of the reset provision on August 3, 2018 | $ 0.50 |
Weighted Average Exercise Price, outstanding, at end of year |  | 0.64
Weighted Average Exercise Price, Exercisable at end of year |  | $ 0.64
Weighted Average Remaining Contractual Life, Outstanding at end of year |  | 4 years 9 months 18 days
Weighted Average Remaining Contractual Life, Exercisable at end of year |  | 4 years 9 months 18 days

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