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Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Contract receivables | $ | $ 3,229 |  | $ 3,622 |  |  |
Less: allowance for doubtful accounts | $ | (30) |  | (36) |  | $ (112) |
Accounts receivable, net | $ | $ 3,199 |  | $ 3,586 |  |  |
ZHEJIANG TIANLAN |  |  |  |  |  |
Contract receivables | ¥ |  | ¥ 160,803 |  | ¥ 165,262 |  |
Less: allowance for doubtful accounts | ¥ |  | (42,182) |  | (26,484) |  | ¥ (24,047)
Accounts receivable, net | ¥ |  | ¥ 118,621 |  | ¥ 138,778 |  |

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