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Condensed Financial Information of the Company Condensed Statement of Cash Flows (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities ¥ 194,961 ¥ (17,125) ¥ (158,937)
Net cash used in investing activities (157,997) (64,289) 9,885
Net cash provided by/(used in) financing activities (23) (32,837) 278,337
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies (822) (2,780) (376)
Net increase/(decrease) in cash, cash equivalents and restricted cash 36,119 (117,031) 128,909
Cash, cash equivalents and restricted cash at beginning of the year 60,846 177,877 48,968
Cash, cash equivalents and restricted cash at end of the year 96,965 60,846 177,877
Parent company | Reportable legal entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities (9,857) (3,298) (1,604)
Net cash used in investing activities   (77,536) (210,769)
Net cash provided by/(used in) financing activities (5,773) (27,360) 371,659
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies (1,047) (2,334) (248)
Net increase/(decrease) in cash, cash equivalents and restricted cash (16,677) (110,528) 159,038
Cash, cash equivalents and restricted cash at beginning of the year 48,510 159,038  
Cash, cash equivalents and restricted cash at end of the year ¥ 31,833 ¥ 48,510 ¥ 159,038