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Commitments and contingencies (Details) $ in Thousands, ¥ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Commitments and contingencies (Details) [Line Items]
Rental expenses	$ 1,429		$ 1,539	$ 1,687
Future minimum purchase commitment ,2023	1,670
Future minimum purchase commitment ,2024	213
Future minimum purchase commitment ,2025	39
Maximum [Member]
Commitments and contingencies (Details) [Line Items]
Claimed damage	$ 1,600	¥ 10.5

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Amount of expense classified as other.

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Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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