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Organization and Reorganization - Cash flow of the group's vie (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Variable Interest Entity [Line Items]        
Net cash generated from/(used in) operating activities $ (13,618) ¥ (88,854) ¥ (161,806) ¥ (53,338)
Net cash (used in)/ generated from investing activities 5,777 37,698 (187,548) (20,746)
Net cash used in financing activities $ (10) (63) (37,245) 562,126
Major VIEs        
Variable Interest Entity [Line Items]        
Net cash generated from/(used in) operating activities   (4,945) (6,612) 24,144
Net cash (used in)/ generated from investing activities   12,050 (5,418) (50)
Net cash used in financing activities   (63)   (31,138)
Net (decrease)/increase in cash and cash equivalent   ¥ 7,042 ¥ (12,030) ¥ (7,044)