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Basic and Diluted Loss per Common Share
3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Basic and Diluted Loss per Common Share
13. Basic and Diluted Loss per Common Share

The following outstanding securities, prior to the use of the treasury stock method or the if-converted method, have been excluded from the computation of diluted weighted-average shares outstanding for the respective periods below because they would have been antidilutive:

Three Months Ended March 31,
20222021
Stock options2,128,943 3,309,771 
Non-vested restricted stock units1,340,037 1,125,631