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Stockholders' equity (Tables)
9 Months Ended
Sep. 30, 2019
Stockholders' equity  
Schedule for number of common stock reserved for exercise of outstanding stock options and warrants

 

 

 

 

 

 

 

September 30, 

 

December 31, 

 

    

2019

 

2018

Warrants

 

39,474

 

110,365

Restricted stock units

 

447,336

 

 —

Stock options

 

4,718,597

 

3,746,567

 

 

5,205,407

 

3,856,932