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Net loss per share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Schedule of antidilutive securities excluded from computation of earnings per share
The following potentially dilutive securities outstanding, prior to the use of the treasury stock method or if-converted method, have been excluded from the computation of diluted weighted-average shares outstanding for the periods indicated, because including them would have had an anti-dilutive impact:
 
 
September 30, 2016
 
September 30, 2015
Options to purchase common stock
2,320,247

 
1,342,141

Unvested restricted common stock
1,452,243

 
2,456,338

Unvested restricted common stock issued upon early exercise of stock options

 
37,064

Total
3,772,490

 
3,835,543