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Share-based compensation - Summary of Phantom RSU Award Activity (Details) - Phantom RSU Award Plan - Phantom RSU Award $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares
Units |
Units, beginning balance (in shares) | 1,661,820
Grant (in shares) | 65,440
Partial vesting of 2019 Grant (in shares) | (5,162)
Forfeitures (in shares) | (31,614)
Units, ending balance (in shares) | 1,690,484
Units, exercisable (in shares) | 0
Number of units outstanding | 1,690,484
Current share price (in dollars per share) | $ / shares | $ 5.03
Total fair value of the plan | $ | $ 8,503
Weighted-average accumulated percentage of service | 39.00%
Accrued liability | $ | $ 3,316
Compensation expense not yet recognized | $ | $ 5,187
Weighted-average period for recognition | 2 years 11 months 4 days

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363 + Details
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