Share-based compensation - Additional information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based compensation
Share option granted	0	0	0
Total fair values of options vested and recognized as expenses	$ 0	$ 4	$ 107
Unrecognized share-based compensation expenses	$ 0	$ 0	$ 4
Weighted-average expense recognition period			3 months
Ordinary shares
Share-based compensation
Issuance of ordinary shares upon share offerings (in shares)			5,546,007
Class B ordinary shares \| Ordinary shares \| Share subscription agreement
Share-based compensation
Issuance of ordinary shares upon share offerings (in shares)	649,349
Offering price per share	$ 26.52
Fair value, per share	$ 28.88
Discount on shares	$ 1,530

Common stock fair value per share.

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- Definition

Discount on common shares, or any unamortized balance thereof, shown separately as a deduction from the applicable account(s) as circumstances require.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.4-07)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187103-122770

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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

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Amount of noncash expense for option under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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