XML 56 R66.htm IDEA: XBRL DOCUMENT v3.20.1
Income Taxes - Income tax rates (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income taxes      
Income tax rate 25.00% 25.00% 25.00%
Hong Kong      
Income taxes      
Income tax rate 16.50%    
PRC      
Income taxes      
Income tax rate 25.00%