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Contract assets and liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | ---
Unbilled revenue | $ | $ 74 |  | $ 202 |
ZHEJIANG TIANLAN |  |  |  |
Unbilled revenue | ¥ |  | ¥ 72,310 |  | ¥ 94,494

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