XML 141 R101.htm IDEA: XBRL DOCUMENT v3.22.1
Share-based compensation - Summary of Phantom RSU Award Activity (Details) - Phantom RSU Award Plan - Phantom RSU Award - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Units      
Units, beginning balance (in shares) 1,690,484 1,661,820  
Grant (in shares) 918,387 65,440 1,672,657
Partial vesting of 2019 Grant (in shares) (173,916) (5,162)  
Vesting of 2020 grant (in shares) (65,440)    
Forfeitures (in shares) (329,027) (31,614) (10,837)
Units, ending balance (in shares) 2,040,488 1,690,484 1,661,820
Partial vesting grant in value $ 1,104 $ 18  
Vesting grant in value $ 416    
Number of units outstanding 2,040,488    
Current share price (in dollars per share) $ 5.83    
Total fair value of the plan $ 11,896    
Weighted-average accumulated percentage of service 44.12%    
Accrued liability $ 5,248    
Compensation expense not yet recognized $ 6,648    
Weighted-average period for recognition 2 years 3 months 21 days