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

Compensation expense related to non-vested units that will be recognized in future awards.

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Number of units exercisable in the period.

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Weighted average strike price of exercisable units.

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Total fair value of outstanding units, including vested and non-vested units.

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As of the balance sheet date weighted-average accumulated percentage of service rendered by employees for both vested and non-vested outstanding units.

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As of the balance sheet date, the weighted-average fair market value of both vested and non-vested outstanding units.

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Amount of increase (decrease) to additional paid-in capital (APIC) for recognition and exercise of award under share-based payment arrangement.

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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.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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