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Trade Accounts and Financing Receivables - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Accounts Notes And Loans Receivable [Line Items]            
Trade accounts receivable   $ 15,789   $ 15,789   $ 15,776
Revenue   12,153 $ 13,270 34,457 $ 40,454  
Single Customer            
Accounts Notes And Loans Receivable [Line Items]            
Trade accounts receivable   $ 5,400   5,400    
Revenue       $ 14,600    
Single Customer | Subsequent Event            
Accounts Notes And Loans Receivable [Line Items]            
Proceeds from trade accounts receivable $ 1,100