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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 12,338 $ 11,911
Less: Allowance for doubtful accounts 0 0
Accounts receivable, net 12,338 11,911
Billed Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable 11,989 11,862
Unbilled Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 349 $ 49