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FINANCE INCOME AND COSTS (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Finance Income And Costs |  |  |  |  |
Interest income on loans to related parties/ a third party | ¥ |  |  | ¥ 6,792 | ¥ 6,780 | ¥ 6,455
Interest income on loans to related parties/ a third party | $ |  | $ 985 |  |  |
Interest income on revenue contracts with significant financing component |  | 305 | 2,104 | 2,313 | 3,161
Interest income from service concession arrangement |  | 960 | 6,620 | 7,264 | 4,977
Interest income on structured deposits |  |  |  | 328 | 660
Interest income on bank deposit |  | 13 | 91 | 250 | 215
Finance income |  | 2,263 | 15,607 | 16,935 | 15,468
Interest expenses on loans |  | 563 | 3,882 | 4,035 | 4,028
Interest expense on lease liabilities |  | 19 | 133 | 150 | 80
Other finance costs | [1] | (90) | (620) | 231 | 292
Less: interest expense capitalized into intangible assets-concession right | [2] |  |  | (57) | (651)
Finance costs |  | 492 | 3,395 | 4,359 | 3,749
Bank charges |  | 6 | 42 | 38 | 37
Foreign currency exchange losses/(gains) |  | $ (96) | ¥ (662) | ¥ 193 | ¥ 255
Capitalized rate |  | 5.05% | 5.05% | 5.05% |
[1] | Finance costs from operations mainly represented bank charges and foreign currency exchange differences. The amounts of bank charges were CNY37, CNY38 and CNY42 (US$6) and the foreign currency exchange losses/(gains) amounted to CNY255, CNY193 and CNY (662) (US$(96)) for the years ended December 31, 2020, 2021 and 2022, respectively.
[2] | The borrowing costs have been capitalized at a rate of 5.05% per annum during the years ended December 31, 2020 and 2021.

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