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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accounts receivable | ¥ 90,453 |  | ¥ 144,921 |  | $ 13,155
Allowance for doubtful accounts | (3,585) |  | (12,969) |  | (521)
Accounts receivable, net | 86,868 |  | 131,952 |  | $ 12,634
The movement in the allowance for doubtful accounts were as follows: |  |  |  |  |
Balance at the beginning of the year | 12,969 | $ 1,886 | 57 | ¥ 1,781 |
Provisions for the year | 1,303 | 189 | 14,840 | 1,066 |
Reversal of provisions from prior periods due to subsequent cash collection during the year | (709) | (103) | 0 | 0 |
Amounts written off during the year | (9,989) | (1,453) | (1,928) | (2,790) |
Foreign exchange gain or loss | 11 | 2 | 0 | 0 |
Balance at the end of the year | ¥ 3,585 | $ 521 | ¥ 12,969 | ¥ 57 |

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