Condensed Consolidated Statements of Cash Flows Supplemental Information - Write-downs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Write-downs
Inventories	[1]	$ 12	$ 103
Equipment supporting joint revenue sharing arrangements	[2]	202	151
Other property, plant and equipment		2	3
Film assets	[3]	165	(44)
Write-downs		$ 381	$ 213

[1] In the three months ended March 31, 2022, the Company recorded write-downs of less than $0.1 million (2021 — $0.1 million) in Costs and Expenses Applicable to Technology Sales related to excess and obsolete inventory.

[2] In the three months ended March 31, 2022, the Company recorded charges of $0.2 million (2021 — $0.2 million) in Costs and Expenses Applicable to Technology Rentals mostly related to the write-down of leased xenon-based digital systems which were taken out of service in connection with customer upgrades to laser-based digital systems.

[3] In the three months ended March 31, 2022, the Company recorded impairment losses of $0.2 million (2021 — $nil) related to the write-down of DMR and Film Distribution related film assets.