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Income Taxes - Summary of the Provision for Income Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:              
Federal         $ 0 $ 4,000 $ 0
State         0 2,000 0
Foreign         0 0 2,170,000
Current income tax expense (benefit)         0 6,000 2,170,000
Deferred:              
Federal         0 (263,000)
State         0 0 0
Foreign         0 0 0
Deferred income tax expense (benefit)         0 (263,000) 0
Income tax expense (benefit) $ (87,764) $ 0 $ (106,771) $ (62,800) $ 0 $ (257,335) $ 2,169,811