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Condensed Financial Information of the Company Condensed Statement of Cash Flows (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities $ (22,829) ¥ (158,937) ¥ (45,598) ¥ (11,444)
Net cash used in investing activities 1,421 9,885 (56,294) (105,892)
Net cash provided by financing activities 39,979 278,337 104,716 162,979
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies (54) (376) 501  
Net increase in cash, cash equivalents and restricted cash 18,517 128,909 3,325 45,643
Cash, cash equivalents and restricted cash at beginning of the year 7,034 48,968 45,643  
Cash, cash equivalents and restricted cash at end of the year 25,551 177,877 ¥ 48,968 ¥ 45,643
Parent company | Reportable legal entities        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities (231) (1,604)    
Net cash used in investing activities (17,754) (123,599)    
Net cash provided by financing activities 40,864 284,489    
Effect of exchange rate changes on cash, cash equivalents and restricted cash held in foreign currencies (35) (248)    
Net increase in cash, cash equivalents and restricted cash 22,844 159,038    
Cash, cash equivalents and restricted cash at end of the year $ 22,844 ¥ 159,038