Revenue - Summary of Revenue by Geographic Area (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue $ 21,818,753 $ 41,434 $ 47,407,555 $ 106,408
United States [Member]        
Revenue $ 14,054,316 $ 41,434 $ 28,151,446 $ 106,408
Percentage of revenue 64.00% 100.00% 59.00% 100.00%
Rest of World [Member]        
Revenue $ 7,764,437 $ 19,256,109
Percentage of revenue 36.00% 0.00% 41.00% 0.00%