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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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