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ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accounts receivable | ¥ 189,646 |  | ¥ 220,035 |  | $ 27,314
Allowance for doubtful accounts | (57) |  | (1,781) |  | (8)
Accounts receivable, net | 189,589 |  | 218,254 |  | $ 27,306
The movement in the allowance for doubtful accounts were as follows: |  |  |  |  |
Balance at the beginning of the year | 1,781 | $ 257 | 2,281 | ¥ 3,091 |
Acquisition of CHS |  |  | 167 |  |
Provisions for the year | 1,066 | 154 | 2,925 | 700 |
Reversal of provisions from prior periods due to subsequent cash collection during the year |  |  | (749) | (1,510) |
Amounts written off during the year | (2,790) | (403) | (2,843) |  |
Balance at the end of the year | ¥ 57 | $ 8 | ¥ 1,781 | ¥ 2,281 |

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