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Parent only financial information - Condensed Statements of Results of Operations (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Operating expenses:        
General and administrative expenses $ (74,754) ¥ (520,421) ¥ (145,277) ¥ (156,329)
Total operating expenses (185,843) (1,293,799) (407,253) (386,452)
Loss from operations (77,100) (536,757) 69,375 (4,864)
Other income (expenses):        
Interest income, net (1,252) (8,719) (1,118) (13,034)
(Loss) income before income tax (72,770) (506,621) 108,459 3,015
Income tax expense 541 3,766 4,433 2,366
Net income (loss) (73,311) (510,387) 104,026 649
Accretion of Redeemable Convertible Preferred Shares (16,707) (116,308) (248,186) (228,468)
Deemed dividend to preferred shareholder 92,243 642,174    
Net loss attributable to ordinary shareholders $ (182,261) (1,268,869) (144,160) (227,819)
Reportable Legal Entities | Parent Company        
Operating expenses:        
General and administrative expenses   (881) (72) (2,722)
Total operating expenses   (881) (72) (2,722)
Loss from operations   (881) (72) (2,722)
Equity (loss) income of subsidiaries and the VIE and VIE's subsidiaries   147,511 22,921 54,226
Other income (expenses):        
Interest income, net   (2) (2) 243
(Loss) income before income tax   146,628 22,847 51,747
Income tax expense   0    
Net income (loss)   146,628 22,847 51,747
Accretion of Redeemable Convertible Preferred Shares   (116,308) (248,186) (228,468)
Deemed dividend to preferred shareholder   642,174    
Net loss attributable to ordinary shareholders   ¥ (611,854) ¥ (225,339) ¥ (176,721)