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Contract assets and liabilities (Details 4) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Net contract liabilities | $ | $ (584) |  | $ (408) |
Contract assets | $ | 66 |  | 217 |
Unbilled revenue |  |  |  |
Net contract liabilities | $ | 66 |  | 217 |
Contract assets | $ | 66 |  | 217 |
Deferred revenue |  |  |  |
Net contract liabilities | $ | $ (650) |  | $ (625) |
ZHEJIANG TIANLAN |  |  |  |
Gross contract assets | ¥ |  | ¥ 83,170 |  | ¥ 89,440
Less: allowance for doubtful accounts | ¥ |  | (10,290) |  | (12,448)
Net contract liabilities | ¥ |  | 29,428 |  | 42,489
Contract assets | ¥ |  | 72,880 |  | 76,992
ZHEJIANG TIANLAN | Unbilled revenue |  |  |  |
Contract assets | ¥ |  | ¥ 72,880 |  | ¥ 76,992

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