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Share-based compensation - Summary of Activity of Restricted Share Units (Details) - Restricted Share Units - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
2011 Equity Incentive Plan |  |  |
Units |  |  |
Units, beginning balance (in shares) | 186,796 | 451,198 | 937,839
Forfeitures (in shares) | (8,522) | (11,774) | (4,367)
Units, ending balance (in shares) | 61,766 | 186,796 | 451,198
Units, exercisable (in shares) | 0 |  |
Weighted-average grant-date fair value |  |  |
Units, beginning balance (in dollars per share) | $ 8.70 | $ 7.80 | $ 7.50
Forfeitures (in dollars per share) | 8.62 | 8.69 | 7.75
Units, ending balance (in dollars per share) | 8.50 | $ 8.70 | $ 7.80
Units, exercisable (in dollars per share) | $ 0 |  |
Number of units outstanding (in shares) | 61,766 |  |
Weighted-average grant-date fair market value per unit (in dollars per share) | $ 8.50 |  |
Total grant-date fair value | $ 525 |  |
Weighted-average accumulated percentage of service | 92.90% |  |
Stock-based compensation recognized in Additional paid-in capital | $ 488 |  |
Compensation expense not yet recognized | $ 37 |  |
Weighted-average period for recognition | 1 month 6 days |  |
2015 grant |  |  |
Units |  |  |
Vesting and partial vesting (in shares) |  |  | (101,928)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  |  | $ 6.33
2016 grant |  |  |
Units |  |  |
Vesting and partial vesting (in shares) |  | (110,213) | (114,045)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  | $ 4.70 | $ 4.70
2017 grant |  |  |
Units |  |  |
Vesting and partial vesting (in shares) | (51,613) | (62,742) | (67,606)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) | $ 9.20 | $ 9.20 | $ 9.20
2018 grant |  |  |
Units |  |  |
Vesting and partial vesting (in shares) | (64,895) | (79,673) | (163,695)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) | $ 8.50 | $ 8.50 | $ 8.50
2019 grant |  |  |
Units |  |  |
Vesting and partial vesting (in shares) |  |  | (35,000)
Weighted-average grant-date fair value |  |  |
Partial vesting (in dollars per share) |  |  | $ 8.00

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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