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Operations and Reorganization - Liquidity (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Mar. 23, 2018
USD ($)
subsidiary
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Liquidity            
Net losses   $ 15,000 ¥ 104,420 ¥ 416,694 ¥ 580,811  
Accumulated deficits   315,853   2,094,482   ¥ 2,198,902
Net current liabilities       930,993   1,228,049
Operating cash inflow   57,158 ¥ 397,933 ¥ 29,781 ¥ 55,074  
Short-term loan   $ 2,381       16,578
Balance of cash and cash equivalents, time deposits (current and non-current) and short-term investments           1,053,395
Subsidiaries | Hong Kong            
Liquidity            
Number of subsidiaries | subsidiary 2          
Maximum borrowing capacity | $ $ 13,000          
Short-term loan           ¥ 16,578
Interest rate spread (as a percent)   6.37% 6.37%      
Subsidiaries | Hong Kong | 3-month LIBOR            
Liquidity            
Interest rate spread (as a percent) 4.36%