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Net Loss Per Common Share (Tables)
6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of antidilutive shares excluded from computation of diluted net loss per share
  June 30,
2016
  June 30,
2017
 
Stock options  393,723   382,850 
Convertible preferred stock  1,698   1,698 
Common stock warrants  45,343   - 
Total shares excluded from calculation  440,764   384,548