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SEGMENT REPORTING (Schedule of Net Revenue by Country based upon Sales Location that Predominately represents Customer Location) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Segment reporting [Line Items]        
Net Revenues ¥ 485,633 $ 76,206 ¥ 223,011 ¥ 198,363
CHINA        
Segment reporting [Line Items]        
Net Revenues ¥ 485,633 $ 76,206 199,370 164,167
SINGAPORE        
Segment reporting [Line Items]        
Net Revenues     ¥ 23,641 ¥ 34,196