Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable and Concentration of Credit Risk (Narrative) (Details)

v3.20.4
Accounts Receivable and Concentration of Credit Risk (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
customer
Dec. 31, 2019
USD ($)
customer
Sep. 30, 2020
customer
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Change in allowance for doubtful accounts | $ $ 0 $ 0  
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Credit terms 30 days    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Credit terms 120 days    
Assets, Current [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Customers 0   0
Accounts Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk, percentage 81.00%   89.00%
Number of Customers 4   3
Total Revenue [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk, percentage 61.00% 86.00%  
Number of Customers 2 3  
Brazil [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Credit terms 90 days