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Condensed Financial Information of the Company Condensed Statement of Cash Flows (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities ¥ (122,163) ¥ (4,989) ¥ 194,961
Net cash used in investing activities 20,173 43,311 (157,997)
Net cash used in financing activities 481 5,124 (23)
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies 362 2,200 (822)
Net decrease in cash and cash equivalents (101,147) 45,646 36,119
Cash, cash equivalents and restricted cash at beginning of the year 142,611 96,965 60,846
Cash, cash equivalents and restricted cash at end of the year 41,464 142,611 96,965
Parent company | Reportable legal entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash used in operating activities (4,078) (12,381) (9,857)
Net cash used in investing activities (10,624)    
Net cash used in financing activities     (5,773)
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies 1,020 3,913 (1,047)
Net decrease in cash and cash equivalents (13,682) (8,468) (16,677)
Cash, cash equivalents and restricted cash at beginning of the year 23,365 31,833 48,510
Cash, cash equivalents and restricted cash at end of the year ¥ 9,683 ¥ 23,365 ¥ 31,833