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Warrants
6 Months Ended
Jun. 30, 2017
Stockholders' Equity Note [Abstract]  
Warrants
6.
Warrants
 
At June 30, 2017 and December 31, 2016, we had 7,460,283 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 June 30, 2017, 142,858 warrants were exercised with a weighted average exercise price of $1.12.