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Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |  |
Business base percentage, prime contracts |  | 95.00% |
Business base percentage, subcontracts |  | 5.00% |
Increase in fair value of intangibles resulting from purchase accounting adjustment | $ 9,000,000 |  |
Decrease in amortization of intangible assets | 300,000 | $ 324,000 |
Goodwill, impairment evaluation value |  |  | $ 26,000,000
Goodwill impairment loss |  | 0 |
Decrease in goodwill resulting from purchase accounting adjustment | $ (9,000,000) | $ (8,756,000) |
Finite-lived intangibles estimated useful lives |  | 10 years |
Uncertain tax positions |  | $ 0 | 0
Tax interest |  | 0 | 0
Tax penalties |  | 0 | 0
Amortization of capitalized computer software |  |  | $ 0
Cash, FDIC insured amount |  | $ 250,000 |
2006 Long Term Incentive Plan | Employee Stock Option |  |  |
Goodwill [Line Items] |  |  |
Number of options that may be granted with a term of more than 10 years from date of grant (in shares) |  | 0 |
Expiration term of options |  | 10 years |
New Enterprise Resource Planning (ERP) System |  |  |
Goodwill [Line Items] |  |  |
Amortization of capitalized computer software |  | $ 0 |
Leasehold Improvements | Minimum |  |  |
Goodwill [Line Items] |  |  |
Estimated useful lives |  | 3 years |
Leasehold Improvements | Maximum |  |  |
Goodwill [Line Items] |  |  |
Estimated useful lives |  | 7 years |

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