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Contract assets and liabilities (Details 5) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | ---
Contract assets, net | $ | $ 74 |  | $ 202 |
ZHEJIANG TIANLAN |  |  |  |
Gross contract assets |  | ¥ 81,198 |  | ¥ 102,144
Less: allowance for doubtful accounts |  | (8,888) |  | (7,650)
Contract assets, net |  | ¥ 72,310 |  | ¥ 94,494

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