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Income Taxes - Reconciliation of the differences between statutory income tax rate and the effective income tax rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation      
Statutory EIT rate 25.00% 25.00% 25.00%
Effect of non-deductible expenses (386.74%) 3.28% 16.59%
Tax incentives for research and development expense 111.56% (7.35%) (6.93%)
Tax incentives for wages of disabled staff 9.89% (0.36%) (1.56%)
Change in valuation allowance (154.03%) 5.82%  
Non-taxable item 47.58%    
Tax rate difference from statutory rate in other jurisdictions 7.45% 0.40%  
Others 8.72%   (0.06%)
Effective income tax rate (330.57%) 26.79% 33.04%
Percentage of tax incentives on research and development expenses 175.00% 175.00% 150.00%