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Accounts receivable net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Contract receivables | $ | $ 2,864 |  | $ 1,614 |  |  |
Less: allowance for doubtful accounts | $ | 0 |  | (28) |  | $ (30) |
Accounts receivable, net | $ | $ 2,864 |  | $ 1,586 |  |  |
ZHEJIANG TIANLAN |  |  |  |  |  |
Contract receivables | ¥ |  | ¥ 157,879 |  | ¥ 175,792 |  |
Less: allowance for doubtful accounts | ¥ |  | (29,644) |  | (40,019) |  | ¥ (42,867)
Accounts receivable, net | ¥ |  | ¥ 128,235 |  | ¥ 135,773 |  |

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