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Parent only financial information - Condensed Balance Sheets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Current assets          
Cash and cash equivalents $ 158,543 ¥ 1,103,747 ¥ 443,586    
Total current assets 535,783 3,730,020 2,429,293    
Non-current assets          
Total non-current assets 92,233 642,105 449,991    
Total assets 628,016 4,372,125 2,879,284    
Current liabilities          
Accrued expenses and other payables 48,641 338,626 425,470    
Total current liabilities 398,053 2,771,160 1,990,784    
Total liabilities 399,764 2,783,070 2,003,430    
Mezzanine equity          
Total mezzanine equity     2,743,144 ¥ 2,357,079 ¥ 2,278,046
Deficit          
Series A-1 Convertible Preferred Shares     5,513    
Additional paid-in capital 700,988 4,880,135 55,052    
Accumulated other comprehensive loss (52,989) (368,897) (274,540)    
Accumulated deficit (419,747) (2,922,184) (1,653,315)    
Total (deficit) equity 228,252 1,589,055 (1,867,290)    
Total liabilities, mezzanine equity and (deficit) equity $ 628,016 4,372,125 2,879,284    
Reportable Legal Entities | Parent Company          
Current assets          
Cash and cash equivalents   431,029 36    
Total current assets   431,029 36    
Non-current assets          
Investments in and amounts due from subsidiaries, the VIE and VIE's subsidiaries   2,145,325 1,197,490    
Total non-current assets   2,145,325 1,197,490    
Total assets   2,576,354 1,197,526    
Current liabilities          
Accrued expenses and other payables   29,202 20,590    
Total current liabilities   29,202 20,590    
Total liabilities   29,202 20,590    
Mezzanine equity          
Total mezzanine equity   0 2,743,144    
Deficit          
Ordinary shares   0      
Additional paid-in capital   4,880,135 55,052    
Accumulated other comprehensive loss   (368,897) (274,540)    
Accumulated deficit   (1,964,087) (1,352,233)    
Total (deficit) equity   2,547,152 (1,566,208)    
Total liabilities, mezzanine equity and (deficit) equity   2,576,354 1,197,526    
Series A-2 Redeemable Convertible Preferred Shares          
Mezzanine equity          
Total mezzanine equity     102,743 89,814 88,300
Series A-2 Redeemable Convertible Preferred Shares | Reportable Legal Entities | Parent Company          
Mezzanine equity          
Total mezzanine equity   0 102,743    
Series B Redeemable Convertible Preferred Shares          
Mezzanine equity          
Total mezzanine equity     446,889 390,651 384,068
Series B Redeemable Convertible Preferred Shares | Reportable Legal Entities | Parent Company          
Mezzanine equity          
Total mezzanine equity   0 446,889    
Series C Redeemable Convertible Preferred Shares          
Mezzanine equity          
Total mezzanine equity     2,193,512 ¥ 1,876,614 ¥ 1,805,678
Series C Redeemable Convertible Preferred Shares | Reportable Legal Entities | Parent Company          
Mezzanine equity          
Total mezzanine equity   0 2,193,512    
Series A-1 Convertible Preferred Shares | Reportable Legal Entities | Parent Company          
Deficit          
Series A-1 Convertible Preferred Shares   0 ¥ 5,513    
Class A ordinary shares          
Deficit          
Ordinary shares   1      
Total (deficit) equity   1      
Class A ordinary shares | Reportable Legal Entities | Parent Company          
Deficit          
Ordinary shares   1      
Class B Ordinary shares | Reportable Legal Entities | Parent Company          
Deficit          
Ordinary shares   ¥ 0