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Warrants
6 Months Ended
Jun. 30, 2016
Stockholders' Equity Note [Abstract]  
Warrants
7.
Warrants
 
At June 30, 2016 and December 31, 2015, we had 7,745,997 and 7,195,997 warrants outstanding, respectively and exercisable with a weighted average exercise price of $4.40 and $4.60, respectively. The outstanding warrants have expiration dates between August 2016 and May 2021.