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Supporting Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Billed receivables | $ 21,979 | $ 10,066
Contract assets | 2,045 | 214
Total accounts receivable | 24,024 | 10,280
Less: Allowance for doubtful accounts | 0 | 0
Accounts receivable, net | 24,024 | $ 10,280
SSS |  |
Business Acquisition [Line Items] |  |
Accounts receivable, net | $ 13,100 |

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