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Supporting Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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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

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