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Income Taxes - Summary of the Provision for Income Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:              
Federal         $ 0 $ 0 $ 0
State         0 0 0
Current Foreign Tax Expense (Benefit)         2,170,000 0 0
Current income tax expense (benefit)         2,170,000 0 0
Deferred:              
Federal         0 0
State         0 0 0
Deferred Foreign Income Tax Expense (Benefit)         0 0 0
Deferred income tax expense (benefit)         0 0 0
Income tax expense (benefit) $ 0 $ 0 $ 0 $ 2,169,811 $ 2,169,811 $ 0 $ 0