Net loss per share (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017	September 30, 2016
Options to purchase common stock	2,701,922	2,320,247
Unvested restricted common stock	430,439	1,452,243
Total	3,132,361	3,772,490