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Significant Accounting Policies - Revenue recognition (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2019
CNY (¥)
item
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Revenue recognition        
Maximum economic benefit period from paid columns and online courses 1 year 1 year    
Number of forms of offline training services | item 2 2    
Total revenues $ 94,172 ¥ 655,606,000 ¥ 299,093,000 ¥ 120,507,000
Contract assets   0 0  
Revenue recognized included in contract liabilities balance at the beginning of the period   4,230,000 3,550,000 0
Online advertising services        
Revenue recognition        
Total revenues 40,712 283,426,000 173,783,000 73,958,000
Integrated marketing        
Revenue recognition        
Total revenues   250,344,000 40,017,000 10,279,000
Offline events        
Revenue recognition        
Total revenues   53,861,000 53,711,000 31,670,000
Consulting        
Revenue recognition        
Total revenues   15,264,000 6,510,000 516,000
Enterprise value-added services        
Revenue recognition        
Total revenues 45,889 319,469,000 100,238,000 42,465,000
Institutional investor subscription services        
Revenue recognition        
Total revenues   20,039,000 14,368,000 2,299,000
Enterprise subscription services        
Revenue recognition        
Total revenues   2,077,000    
Individual subscription services        
Revenue recognition        
Total revenues   30,595,000 10,704,000 1,785,000
Subscription services        
Revenue recognition        
Total revenues $ 7,571 ¥ 52,711,000 ¥ 25,072,000 ¥ 4,084,000