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Basic and Diluted Earnings Per Common Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Common Share
12. Basic and Diluted Earnings Per Common Share

 

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period, without consideration of potential common shares. Diluted net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding plus potential common shares. Stock options, restricted stock units, and other convertible securities are considered potential common shares and are included in the calculation of diluted net loss per share using the treasury method when their effect is dilutive. Options, restricted stock units and convertible preferred stock representing approximately 201,000 and 210,000 shares of common stock were excluded from the computations of diluted net loss per common share for the years ended December 31, 2020 and 2019, respectively, as their effect was anti-dilutive.