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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accounts receivable | ¥ 144,921 |  | ¥ 189,646 |  | $ 22,274
Allowance for doubtful accounts | (12,969) |  | (57) |  | (1,993)
Accounts receivable, net | 131,952 |  | 189,589 |  | $ 20,281
The movement in the allowance for doubtful accounts were as follows: |  |  |  |  |
Balance at the beginning of the year | 57 | $ 9 | 1,781 | ¥ 2,281 |
Acquisition of CHS | 0 | 0 | 0 | 167 |
Provisions for the year | 14,840 | 2,281 | 1,066 | 2,925 |
Reversal of provisions from prior periods due to subsequent cash collection during the year | 0 | 0 | 0 | (749) |
Amounts written off during the year | (1,928) | (297) | (2,790) | (2,843) |
Balance at the end of the year | ¥ 12,969 | $ 1,993 | ¥ 57 | ¥ 1,781 |

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