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Warrants
 6 Months Ended
Jun. 30, 2017
Warrants  
Warrants

9. Warrants

 

Warrants for the purchase of 18,939 shares of common stock remain outstanding at June 30, 2017 at a weighted average exercise price of $7.92 per share and an expiration date of April 17, 2021.  No warrants were exercised during the six months ended June 30, 2017 and June 30, 2016.