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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue | $ 54,183 | $ 38,700 | $ 33,756 | $ 33,752 | $ 32,489 | $ 36,131 | $ 34,401 | $ 30,215 | $ 160,391 | $ 133,236
Prime |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 154,207 |
Subcontractor |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 6,184 |
Time and materials |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 134,136 |
Cost reimbursable |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 23,200 |
Firm fixed price |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,055 |
Department of Veterans Affairs |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 91,949 |
Department of Health and Human Services |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 62,000 |
Other |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 6,442 |

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