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Capital Stock and Reserves - Performance Stock Units Activity under the IMAX LTIP (Details) - Performance Stock Units [Member] - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of awards outstanding, beginning of period 361,844  
Granted 309,574 370,265
Forfeited (54,634) (2,526)
Number of awards outstanding,end of period 616,784 367,739
Weighted average grant date fair value per share, beginning of period $ 15.68  
Granted, weighted average grant date fair value per share 20.77 $ 15.66
Forfeited, weighted average grant date fair value per share 16.08 14.84
Weighted average grant date fair value per share, end of period $ 18.20 $ 15.67