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Condensed Consolidated Statements of Cash Flows Supplemental Information - Write-downs (Parenthetical) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]        
Theater system components written off in Costs and expenses     $ 300 $ 1,100
Write-downs for excess and obsolete inventory $ 300 $ 600 $ 468 [1] 729 [1]
Film assets write downs on impairment loss       10,200
Other assets write down on impairment       $ 1,200
[1] In the nine months ended September 30, 2021, the Company recorded write-downs of $0.5 million (2020 — $0.7 million) in Costs and Expenses Applicable to Technology Sales related to excess and damaged inventory.