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Warrants
3 Months Ended
Mar. 31, 2017
Stockholders' Equity Note [Abstract]  
Warrants
6. Warrants 
 
At March 31, 2017 and December 31, 2016, we had 7,603,141 warrants outstanding and exercisable with a weighted average exercise price of $4.46. The outstanding warrants have expiration dates between May 2017 and May 2021.