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Taxation (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Income tax expense (income) [Abstract]        
Current income tax expense    
Deferred income tax expense     119,953 173,060
Total income tax expense $ 27,866 $ 293,302 $ 119,953 $ 173,060