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Income Taxes - US and Foreign Income Before Income Taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
United States $ 1,928,627 $ 2,477,871
Foreign 3,602,597 4,015,426
Total $ 5,531,224 $ 6,493,297