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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 USD ($)
ACCOUNTS RECEIVABLE |  |  |  |  |
Accounts receivable | ¥ 83,848 |  | ¥ 80,878 |  | $ 12,850
Allowance for credit losses | (6,473) |  | (7,147) |  | (992)
Accounts receivable, net | 77,375 |  | 73,731 |  | $ 11,858
The rollforward in the allowance for credit losses were as follows: |  |  |  |  |
Balance at the beginning of the year | 7,147 | $ 1,095 | 3,585 | ¥ 12,969 |
Cumulative effect of adopting ASU 2016-13 | 597 | 92 |  |  |
Disposal of subsidiary | (60) | (9) |  |  |
Provisions for the year | 1,879 | 288 | 4,510 | 1,303 |
Reversal of provisions from prior periods due to subsequent cash collection during the year | (1,415) | (217) | (221) | (709) |
Amounts written off during the year | (1,675) | (257) | (734) | (9,989) |
Foreign exchange gain or loss | 0 | 0 | 7 | 11 |
Balance at the end of the year | ¥ 6,473 | $ 992 | ¥ 7,147 | ¥ 3,585 |

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