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Stockholders' equity (Tables)
3 Months Ended
Mar. 31, 2020
Stockholders' equity  
Schedule for number of common stock reserved for exercise of outstanding stock options and warrants

 

 

 

 

 

 

 

March 31, 

 

December 31, 

 

    

2020

 

2019

Stock options

 

6,049,288

 

4,720,772

Restricted stock units

 

760,193

 

447,336

Warrants

 

39,474

 

39,474

Exchange warrants

 

 —

 

2,575,000

 

 

6,848,955

 

7,782,582