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Other income / (losses), net (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
Exchange gain / (loss), net | $ | $ 101 |  |  | $ (30) |  | $ 7 |
Rental income | $ | 59 |  |  | 82 |  | 51 |
Government subsidies - Employment Support Scheme | $ | 147 | [1] |  | 0 |  | 0 |
Other income, net | $ | 307 |  |  | 52 |  | 58 |
Impairment loss on property, plant and equipment | $ | $ 54 |  |  | $ 10 |  | $ 0 |
ZHEJIANG TIANLAN |  |  |  |  |  |  |
Compensation income |  |  | ¥ 22,548 |  | ¥ 0 |  | ¥ 0
Gain on disposal of property, plant and equipment |  |  | 0 |  | 39 |  | 0
Investment income |  |  | 266 |  | 0 |  | 1,661
Others |  |  | 4,535 |  | 280 |  | 1,363
Reversal of allowance for doubtful accounts |  |  | 6,463 |  | 0 |  | 0
Subsidy income |  |  | 5,834 |  | 5,957 |  | 5,537
Other income, net |  |  | 39,646 |  | 6,276 |  | 8,561
Bad debts written off |  |  | 0 |  | 5,383 |  | 13,946
Impairment loss on contract assets |  |  | 1,399 |  | 0 |  | 0
Impairment loss on long-term investments |  |  | 1,340 |  | 0 |  | 0
Impairment loss on property, plant and equipment |  |  | 2,742 |  | 0 |  | 33,500
Investment loss |  |  | 0 |  | 241 |  | 0
Other losses, net |  |  | ¥ 5,481 |  | ¥ 5,624 |  | ¥ 47,446
[1] | The amount represents salaries and wage subsidies granted under Anti-Epidemic Fund by the Government of the Hong Kong Special Administrative Region for the use of paying wages of employees from June to November 2020.

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