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Net Loss Per Common Share (Tables)
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of antidilutive shares excluded from computation of diluted net loss per share
    March 31,
2016
    March 31,
2017
 
Stock options     376,775       387,519  
Convertible preferred stock     1,698       1,698  
Common stock warrants     45,343       -  
Total shares excluded from calculation     423,816       389,217