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Common Shares - Summary Of Phantom Units Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities, Current	$ 1,126	$ 1,070
Stock-based compensation expense	$ 913	$ 765
Earnings Per Share, Basic	$ 0.00	$ (0.09)
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities, Current	$ 39	$ 26
Stock-based compensation expense	98	84
Payments for Share Based Compensation	$ 86	$ 81
Unvested, Number of units, beginning of period (in shares)	144,000	265,000
Cancelled/forfeited, Number of units (in shares)		(32,667)
Vested, net of shares withheld, Number of units (in shares)	(72,000)	(88,333)
Unvested, Number of units, end of period (in shares)	72,000	144,000	265,000
Weighted average remaining contractual term	6 months	1 year	1 year 6 months

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