Condensed Consolidated Statements of Cash Flows Supplemental Information - Write-downs, Net of Recoveries (Parenthetical) (Details) - USD ($)		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Property plant and equipment write downs no longer in use		$ 100,000	$ 800,000
Theater system components written off in Cost of Sales		200,000	0
Theater system components written off in Revenue		100,000	0
Write down costs incurred in certain film asset	[1]	$ 179,000	$ 0

[1] The Company discontinued production of a certain film asset in 2019, resulting in a write down of costs incurred totalling $0.2 million (2018 —$nil).