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Net Income (Loss) Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Exercise of outstanding stock options 517,972 625,502 496,421 629,671
Shares issued on exercise of outstanding stock options     21,551  
Exercise of outstanding stock options 6,254   2,085