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Debt - EB-5 Loan (Details) - USD ($)
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Sep. 30, 2016
Debt          
Issuance costs   $ 99,202 $ 103,925    
EB-5 Loan | Loans payable          
Debt          
Maximum borrowing         $ 10,000,000.0
Borrowing increments $ 500,000        
Interest rate (as a percent)         4.00%
Amount borrowed $ 1,000,000.0     $ 1,000,000.0  
Issuance costs       $ 100,000