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Stockholders' Equity and Stock-based Compensation - Schedule of Warrants Activity (Details) - Warrant [Member] | 9 Months Ended
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Sep. 30, 2018 $ / shares shares
Number of Shares Subject to Warrants, Outstanding, beginning balance | 6,264,215
Number of Shares Subject to Warrants Outstanding, Granted |
Number of Shares Subject to Warrants Outstanding, Exercised | (1,798,558)
Number of Shares Subject to Warrants Outstanding, Expired | (115,688)
Number of Shares Subject to Warrants, Outstanding, ending balance | 4,349,969
Weighted average remaining contractual life of the outstanding warrants in years | 2 years 22 days
Weighted avg. Exercise Price, outstanding, beginning balance | $ / shares | $ 1.91
Weighted avg. Exercise Price, exercised | $ / shares | 1.79
Weighted avg. Exercise Price, expired | $ / shares | 6.94
Weighted avg. Exercise Price, outstanding and exercisable, ending balance | $ / shares | $ 1.90

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