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Other income / (losses), net (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
Exchange (loss) / gain, net | $ | $ (30) |  | $ 7 |  | $ (46) |
Rental income | $ | 82 |  | 51 |  | 32 |
Total | $ | $ 52 |  | $ 58 |  | $ (14) |
ZHEJIANG TIANLAN |  |  |  |  |  |
Gain on disposal of property, plant and equipment |  | ¥ 39 |  | ¥ 0 |  | ¥ 0
Subsidy income |  | 5,957 |  | 5,537 |  | 2,262
Sales of scrapped materials |  | 0 |  | 0 |  | 37
Investment income |  | 0 |  | 1,661 |  | (405)
Others |  | 280 |  | 1,363 |  | (7)
Other income, net |  | 6,276 |  | 8,561 |  | 1,887
Bad debts written off |  | 5,383 |  | 13,946 |  | 0
Impairment loss on property, plant and equipment |  | 0 |  | 33,500 |  | 0
Investment loss |  | 241 |  | 0 |  | 0
Other losses, net |  | 5,624 |  | 47,446 |  | 0
Total |  | ¥ 652 |  | ¥ (38,885) |  | ¥ 1,887

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