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Parent only financial information (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 only financial information        
Net cash provided by operating activities ¥ (126,983) $ (18,410) ¥ (60,618) ¥ (324,995)
Cash flows from investing activities:        
Investment in short-term investments (464,914) (67,406) (104,139) (1,266,273)
Net cash used in investing activities (159,268) (23,091) (43,725) 5,848
Cash flows Provided by financing activities:        
Proceeds from offering, net of offering cost 3,136 455    
Net cash provided by financing activities (58,654) (8,503) (307,129) (46,557)
Effect of exchange rate changes on cash and cash equivalents 11,412 1,655 (8,320) (32,138)
Net increase (decrease) in cash and cash equivalents (333,493) (48,349) (419,792) (397,842)
Cash, cash equivalents and restricted cash at the beginning of the year 516,238 74,847 936,030 1,333,872
Cash, cash equivalents and restricted cash at the end of the year 182,745 $ 26,498 516,238 936,030
Reportable Legal Entities | Parent Company        
Parent only financial information        
Net cash provided by operating activities (5,064)   (18,400) (5,894)
Cash flows from investing activities:        
Investments in and amounts due from subsidiaries, the VIE and VIE's subsidiaries     (128,192) (115,569)
Investment in short-term investments (168,198)     (1,185,713)
Proceeds from redemption of short-term investments 18,826     1,185,713
Net cash used in investing activities (149,372)   (128,192) (115,569)
Cash flows Provided by financing activities:        
Proceeds from offering, net of offering cost 3,136      
Net cash provided by financing activities 3,136      
Effect of exchange rate changes on cash and cash equivalents 11,036      
Net increase (decrease) in cash and cash equivalents (140,264)   (146,592) (121,463)
Cash, cash equivalents and restricted cash at the beginning of the year 162,974   309,566 431,029
Cash, cash equivalents and restricted cash at the end of the year ¥ 22,710   ¥ 162,974 ¥ 309,566