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Net loss per share (Tables)
3 Months Ended
Mar. 31, 2020
Net loss per share  
Outstanding potentially dilutive securities excluded in the calculation of diluted net loss per share

As of March 31, 

    

2020

    

2019

Unvested restricted common stock awards

 

176,471

 

235,294

Unvested restricted common stock units

747,427

351,615

Outstanding stock options

 

6,065,155

 

4,843,094

Total

 

6,989,053

 

5,430,003