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Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2021
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 securitiesThree Months Ended
September 30,
Nine Months Ended
September 30,
 2021202020212020
Stock options4,802,666 2,783,591 4,802,666 2,783,591 
Warrants1,643,158 1,908,643 1,643,158 1,908,643 
Total6,445,824 4,692,234 6,445,824 4,692,234