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, 2021	Dec. 31, 2020	Dec. 31, 2019
2011 Equity Incentive Plan
Units
Units, beginning balance (in shares)	451,198	937,839	1,605,049
Annual grant (in shares)			35,000
Forfeitures (in shares)	(11,774)	(4,367)	(239,621)
Units, ending balance (in shares)	186,796	451,198	937,839
Units, exercisable (in shares)	0
Weighted-average grant-date fair value
Units, beginning balance (in dollars per share)	$ 7.80	$ 7.50	$ 7.41
Annual grant (in dollars per share)			8.00
Forfeitures (in dollars per share)	8.69	7.75	7.74
Units, ending balance (in dollars per share)	8.70	$ 7.80	$ 7.50
Units, exercisable (in dollars per share)	$ 0
Number of units outstanding	186,796
Weighted-average grant-date fair market value per unit (in dollars per share)	$ 8.70
Total grant-date fair value	$ 1,625
Weighted-average accumulated percentage of service	85.29%
Stock-based compensation recognized in Additional paid-in capital	$ 1,386
Compensation expense not yet recognized	$ 239
Weighted-average period for recognition	3 months 18 days
2014 grant
Units
Partial vesting (in shares)			(38,222)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)			$ 8.58
2015 grant
Units
Partial vesting (in shares)		(101,928)	(115,634)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)		$ 6.33	$ 6.33
2016 grant
Units
Partial vesting (in shares)	(110,213)	(114,045)	(134,501)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)	$ 4.70	$ 4.70	$ 4.70
2017 grant
Units
Partial vesting (in shares)	(62,742)	(67,606)	(174,232)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)	$ 9.20	$ 9.20	$ 9.20
2018 grant
Units
Partial vesting (in shares)	(79,673)	(163,695)
Weighted-average grant-date fair value
Partial vesting (in dollars per share)	$ 8.50	$ 8.50
2019 grant
Units
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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- Definition

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

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Weighted average strike price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average grant-date fair value.

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- Definition

Gross number of share options (or share units) granted during the period.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date.

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Weighted average grant-date fair value.

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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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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

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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- Definition

Units, Shares [Roll Forward]

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Units, Weighted Average Strike Price [Roll Forward]

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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