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Net Loss per Share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
The following potentially dilutive equity securities were not included in the diluted earnings per common share calculation because they would have had an antidilutive effect:
 
As of December 31,
 
2019
 
2018
 
2017
Stock options
2,097,978

 
2,621,503

 
4,006,399

Restricted stock awards and restricted stock units
581,943

 
451,160

 
256,842

Warrants

 
480,000

 
810,000