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Warrants
9 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]  
Warrants
6.
Warrants
 
At September 30, 2017 and December 31, 2016, we had 7,361,283 and 7,603,141 warrants outstanding, respectively and exercisable with a weighted average exercise price of $4.53 and $4.46, respectively. The outstanding warrants have expiration dates between March 2021 and May 2021. During the three month period ended September 30, 2017, 99,000 warrants were exercised with a weighted average exercise price of $4.75, yielding $470,250 in proceeds to the Company. Subsequent to quarter end through October 31, 2017, an additional 294,070 warrants were exercised with a weighted average exercise price of $4.75, yielding $1,396,833 in proceeds to the Company.