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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 8,624 $ 6,637
Less: Allowance for doubtful accounts 0 0
Accounts Receivable, Net 8,624 6,637
Billed Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable 7,046 5,265
Unbilled Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 1,578 $ 1,372