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Supporting Financial Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Billed receivables $ 13,644 $ 10,066
Contract assets 479 214
Total accounts receivable 14,123 10,280
Less: Allowance for doubtful accounts 0 0
Accounts receivable, net $ 14,123 $ 10,280