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Net Loss Per Share (Details) - shares
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Anti-dilutive securities    
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive 14,026,197 12,185,378
Stock Options    
Anti-dilutive securities    
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive 13,966,192 12,088,710
Restricted Stock    
Anti-dilutive securities    
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive 60,005 96,668