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v3.20.1

Significant Accounting Policies - Sales and marketing expenses, Employee Benefits, Segment Reporting and Statutory Reserves (Details) | 12 Months Ended
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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

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