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Significant Accounting Policies - Sales and marketing expenses, Employee Benefits, Segment Reporting and Statutory Reserves (Details)
12 Months Ended
Dec. 31, 2019
CNY (¥)
segment
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Operating Lease      
Capital lease ¥ 0 ¥ 0  
Employee benefits      
Employee social security and welfare benefits ¥ 32,900,000 21,790,000 ¥ 9,120,000
Segment Reporting      
Number of reportable segments | segment 1    
Statutory Reserves      
Percentage of general reserve fund, annual after-tax profits 10.00%    
Maximum percentage of general reserve fund, registered capital 50.00%    
Percentage of statutory surplus fund, annual after-tax profits 10.00%    
Maximum percentage of statutory surplus fund, registered capital 50.00%    
Profit appropriation to reserve funds ¥ 1,080,000 3,640,000 10,000
Sales and marketing expenses      
Sales and marketing expenses      
Total advertising expenses ¥ 700,000 ¥ 3,760,000 ¥ 3,140,000