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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 CNY (¥)
ACCOUNTS RECEIVABLE |  |  |  |  |
Accounts receivable | $ 11,618 |  | ¥ 90,453 |  | ¥ 80,878
Allowance for doubtful accounts | (1,027) |  | (3,585) |  | (7,147)
Accounts receivable, net | 10,591 |  | 86,868 |  | ¥ 73,731
The rollforward in the allowance for doubtful accounts were as follows: |  |  |  |  |
Balance at the beginning of the year | 515 | ¥ 3,585 | 12,969 | ¥ 57 |
Provisions for the year | 648 | 4,510 | 1,303 | 14,840 |
Reversal of provisions from prior periods due to subsequent cash collection during the year | (32) | (221) | (709) | 0 |
Amounts written off during the year | (105) | (734) | (9,989) | (1,928) |
Foreign exchange gain or loss | 1 | 7 | 11 | 0 |
Balance at the end of the year | $ 1,027 | ¥ 7,147 | ¥ 3,585 | ¥ 12,969 |

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