Net loss per share (Tables)

6 Months Ended

Jun. 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:

	June 30, 2017	June 30, 2016
Options to purchase common stock	2,668,187	2,425,017
Unvested restricted common stock	685,890	1,707,694
Total	3,354,077	4,132,711