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LOSS PER SHARE - Computation of basic and diluted loss per share (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Dec. 31, 2018
CNY (¥)
¥ / shares
shares
Dec. 31, 2017
CNY (¥)
¥ / shares
shares
LOSS PER SHARE        
Net loss attributable to ordinary shareholders $ (71,764) ¥ (499,606) ¥ (380,091) ¥ (248,580)
Weighted average number of ordinary shares-basic and diluted 163,671,577 163,671,577 99,451,210 72,000,000
Net loss per share-basic and diluted | (per share) $ (0.44) ¥ (3.05) ¥ (3.82) ¥ (3.45)