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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION        
Net cash (used in) generated from operating activities ¥ (216,694) $ (31,419) ¥ (359,313) ¥ (229,766)
Net cash (used in) generated from investing activities (118,792) (17,223) (565,981) (533,885)
Net cash (used in) generated from financing activities 383,088 55,542 642,449 1,138,302
Exchange rate effect on cash (47,170) (6,837) (4,639) (2,563)
Net (decrease) increase in cash 432 63 (287,484) 372,088
Cash at beginning of the year 157,386      
Cash at end of the year 158,283 22,949 157,386  
Parent Company        
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION        
Net cash (used in) generated from operating activities (2,047) (297) (9,301) 9,041
Net cash (used in) generated from investing activities (29,335) (4,253) (88,546) (7,468)
Net cash (used in) generated from financing activities 16,591 2,405 110,876  
Exchange rate effect on cash 1,243 181 (50) (34)
Net (decrease) increase in cash (13,548) (1,964) 12,979 1,539
Cash at beginning of the year 15,058 2,183 2,079 540
Cash at end of the year ¥ 1,510 $ 219 ¥ 15,058 ¥ 2,079