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Debt - EB 5 Loan Agreement Borrowings (Details) - EB-5 Loan Agreement - Loans payable - USD ($)
1 Months Ended
Sep. 30, 2016
Mar. 31, 2020
Dec. 31, 2016
Debt Instrument [Line Items]      
Maximum borrowing $ 10,000,000    
Borrowing increments $ 500,000    
Interest rate 4.00%    
Company borrowed   $ 500,000 $ 1,000,000