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CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH            
Cash and cash equivalents $ 18,210 ¥ 118,821   ¥ 157,600 ¥ 211,436  
Restricted cash 126 824     30,072  
Total cash, cash equivalents, and restricted cash shown in the unaudited condensed consolidated statements of cash flows $ 18,336 ¥ 119,645 $ 24,151 ¥ 157,600 ¥ 241,508 ¥ 197,653