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Stockholders' Equity - Summary of Warrant Activity (Details) | 6 Months Ended
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Jun. 30, 2018 $ / shares shares
Number of Shares, Exercisable | 2,433,613
Common Stock Warrant [Member] |
Number of Shares, Outstanding at beginning of year | 1,303,832
Number of Shares, Issued | 295,000
Number of Sharess, Exercised |
Number of Shares, Forfeited | (182,200)
Number of Shares, Expired |
Number of Shares, Outstanding at end of year | 1,416,633
Number of Shares, Exercisable | 252,125
Weighted Average Exercise Price, Outstanding at beginning of year | $ / shares | $ 1.48
Weighted Average Exercise Price, Issued | $ / shares | 1.74
Weighted Average Exercise Price, Exercised | $ / shares |
Weighted Average Exercise Price, Forfeited | $ / shares | 1.33
Weighted Average Exercise Price, Expired | $ / shares |
Weighted Average Exercise Price, Outstanding at end of year | $ / shares | 1.49
Weighted Average Exercise Price, Exercisable | $ / shares | $ 1.46
Weighted Average Remaining Contractual Life, Outstanding | 4 years 1 month 9 days
Weighted Average Remaining Contractual Life, Exercisable | 4 years 22 days
Common Stock Financing Warrant [Member] |
Number of Shares, Outstanding at beginning of year | 1,289,172
Number of Shares, Issued | 1,986,558
Number of Sharess, Exercised | (842,117)
Number of Shares, Forfeited |
Number of Shares, Expired |
Number of Shares, Outstanding at end of year | 2,433,613
Number of Shares, Exercisable | 2,433,613
Weighted Average Exercise Price, Outstanding at beginning of year | $ / shares | $ 0.29
Weighted Average Exercise Price, Issued | $ / shares | 1.24
Weighted Average Exercise Price, Exercised | $ / shares | 0.20
Weighted Average Exercise Price, Forfeited | $ / shares |
Weighted Average Exercise Price, Expired | $ / shares |
Weighted Average Exercise Price, Outstanding at end of year | $ / shares | 1.10
Weighted Average Exercise Price, Exercisable | $ / shares | $ 1.10
Weighted Average Remaining Contractual Life, Outstanding | 4 years 8 months 12 days
Weighted Average Remaining Contractual Life, Exercisable | 4 years 8 months 12 days

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