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Net loss per common stock (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of basic and diluted net loss per common stock
   
YEARS ENDED DECEMBER 31,
 
   
2019
   
2018
   
2017
 
Outstanding stock options
   5,840,538    2,897,294    2,069,167 
Restricted stock units
   72,000    —      —   
  
 
 
   
 
 
   
 
 
 
   5,912,538    2,897,294    2,069,167