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Share-based compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 28, 2016 employee shares | Mar. 30, 2011 | Dec. 31, 2020 USD ($) grant $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Accumulated compensation expense | $ |  |  | $ 0 | $ 0 | $ 0
Number of grant types | grant |  |  | 2 |  |
2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan |  | 2.50% |  |  |
Options converted into liability award (in shares) | 1,117,380 |  |  |  |
Number of employees affected by plan modification | employee | 104 |  |  |  |
Share-based compensation expense | $ |  |  | $ 1,564 | 1,884 | 3,661
Related income tax (expense) benefit | $ |  |  | (244) | (422) | (175)
Restricted Share Units | 2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total fair value of share units | $ |  |  | $ 3,475 | $ 3,295 | $ 3,214
Grant (in shares) |  |  |  | 35,000 | 520,393
Grant price (in dollars per share) | $ / shares |  |  |  | $ 8.00 | $ 8.50
Phantom RSU Award | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant (in shares) |  |  | 65,440 |  |
Grant price (in dollars per share) | $ / shares |  |  | $ 6.78 |  |
Allocated share-based compensation expense | $ |  |  | $ 1,232 | $ 2,102 |
Phantom RSU Award Type One | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Requisite service period |  |  | 5 years |  |
Grant (in shares) |  |  | 465,202 |  |
Phantom RSU Award Type Two | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant (in shares) |  |  | 1,207,455 |  |
Phantom RSU Award Type Two | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 100.00% |  |
Grant (in shares) |  |  | 65,440 |  |
Grant price (in dollars per share) | $ / shares |  |  | $ 4.89 |  |
Second Anniversary of Grant Date | 2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |
Second Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |
Three Years Following The Grant Date | 2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Three Years Following The Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fourth Anniversary of Grant Date | 2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fourth Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fifth Anniversary of Grant Date | 2011 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fifth Anniversary of Grant Date | Phantom RSU Award Type One | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fifth Anniversary of Grant Date | Phantom RSU Award Type Two | Phantom RSU Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 100.00% |  |
Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued during the period |  |  | 472,130 | 470,558 | 520,565
Class A | Partial Vesting 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Value of shares pending for issuance in connection with partial vesting | $ |  |  | $ 76 | $ 19 |
Class A | Partial Vesting 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares pending issuance in connection with partial vesting |  |  | 10,392 | 3,032 | 2,775,000
Value of shares pending for issuance in connection with partial vesting | $ |  |  | $ 17 |  |
Common Stock | Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares issued during the period |  |  | 472,130 | 470,558 | 520,565
Accumulated compensation expense | $ |  |  | $ 3,399 | $ 3,359 | $ 3,113

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