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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Potential Dilutive Outstanding Securities Excluded From Diluted Net Loss Per Common Share
The following potentially dilutive outstanding securities were excluded from diluted net loss per common share for the period indicated because of their anti-dilutive effect:
Potentially dilutive securities
 
Three months ended
March 31,
 
 
2019
 
2018
Stock options
 
2,190,360

 
543,396

Warrants
 
3,750,833

 
3,751,002

Total
 
5,941,193

 
4,294,398