Share-based compensation - Summary of Activity of Restricted Share Units (Details) - Restricted share units - $ / shares	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
2011 equity incentive plan
Units
Units, beginning balance (in shares)	61,766	186,796	451,198
Forfeitures (in shares)	(1,143)	(8,522)	(11,774)
Units, ending balance (in shares)	0	61,766	186,796
Units, exercisable (in shares)	0
Weighted-average grant-date fair value
Units, beginning balance (in dollars per share)	$ 8.50	$ 8.70	$ 7.80
Forfeitures (in dollars per share)	8.50	8.62	8.69
Units, ending balance (in dollars per share)	0	$ 8.50	$ 8.70
Units, exercisable (in dollars per share)	$ 0
2016 grant
Units
Vesting and partial vesting (in shares)			(110,213)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)			$ 4.70
2017 grant
Units
Vesting and partial vesting (in shares)		(51,613)	(62,742)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)		$ 9.20	$ 9.20
2018 grant
Units
Vesting and partial vesting (in shares)	(60,623)	(64,895)	(79,673)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)	$ 8.50	$ 8.50	$ 8.50

Number of units exercisable in the period.

No definition available.

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- Definition

Weighted average strike price of exercisable units.

+ References

No definition available.

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- Definition

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

+ References

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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
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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.

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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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