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Common Shares - Summary Of Phantom Units Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities, Current	$ 1,973		$ 1,973		$ 1,126
Stock-based compensation expense	$ 143	$ 165	$ 727	$ 757
Earnings Per Share, Basic	$ (0.02)	$ 0.05	$ (0.06)	$ 0.03
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ (24)	$ 45	$ 26	$ 79
Unvested, Number of units, beginning of period (in shares)			72,000	144,000	144,000
Vested, net of shares withheld, Number of units (in shares)			(72,000)		(72,000)
Unvested, Number of units, end of period (in shares)	0		0		72,000	144,000
Weighted average remaining contractual term			0 years		6 months	1 year

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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