Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Accounts Receivable and Concentration of Credit Risk (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
customer
Mar. 31, 2019
customer
Mar. 31, 2020
USD ($)
customer
Mar. 31, 2019
customer
Sep. 30, 2019
USD ($)
customer
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
Accounts Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk, percentage     81.00%   66.00%
Number of Customers     3   2
Total Revenue [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Concentration risk, percentage 80.00% 82.00% 71.00% 66.00%  
Number of Customers 3 4 2 3  
Brazil [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Credit terms     180 days    
Long term trade receivable | $ $ 1,100   $ 1,100   $ 300