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OTHER NON-CURRENT ASSETS (Schedule of Other Non-Current Assets) (Parenthetical) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) item | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 CNY (¥) | Jun. 21, 2011 CNY (¥)
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Schedule Of Long Term Prepayment Deposits And Other Assets [Line Items] |  |  |  |  |
Deposits - long-term | [1] | ¥ 20,747 | $ 3,189 | ¥ 23,238 |
Arrangement for Robotic Radio Surgery System [Member] |  |  |  |  |
Schedule Of Long Term Prepayment Deposits And Other Assets [Line Items] |  |  |  |  |
Deposits - long-term |  | 11,527 | 1,772 |  | ¥ 23,608
Security deposits non-current |  | ¥ 10,252 | $ 1,576 |  |
Number of installments |  | 9 | 9 |  |
[1] | On June 21, 2011, the Group provided interest-free financing amounting to RMB23,608 to Changhai Hospital, a third party, for the purchase of a robotic radiosurgery system. As at December 31, 2017, the outstanding balance was RMB11,527 (US$1,772), of which RMB10,252 (US$1,576) will be collected from 2019 to 2027 in 9 installments and thus classified as non-current. The balance also included deposit refundable each year for the secured borrowings amounting to RMB81,000 (US$12,449) (note 19).

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