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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Summary of revenue recognized) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Topic 606 revenue $ 20,081 ¥ 139,804 ¥ 114,175 ¥ 91,408
Out of scope of Topic 606 revenue $ 8,412 ¥ 58,559 ¥ 76,723 ¥ 239,569