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Income Taxes - Reconciliation of the differences between PRC statutory income tax rate and the Group's effective income tax rate for PRC operations (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of income taxes      
Tax deductible expenses of the research and development expenses (in percent) 175.00% 175.00% 150.00%
PRC      
Schedule of income taxes      
Statutory income tax rate 25.00% 25.00% 25.00%
Permanent differences 18.00% 46.20% (10.10%)
Change in valuation allowance (33.00%) (77.20%) 2.90%
Effect of preferential tax treatment (18.70%) (37.50%) (6.60%)
Uncertain tax positions (0.70%) (3.30%) 2.90%
Effective income tax rate (9.40%) (46.80%) 14.10%