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Stock-based Compensation, Equity Grants, and Warrants - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Document Fiscal Year Focus |  |  | 2017 |  |
Total compensation expense | $ 64 | $ 10 | $ 549 | $ 342 |
Unrecognized stock-based compensation expense | 412 | 101 | 412 | 101 |
DLH Employees |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense | 404 | 30 | 404 | 30 |
Non-employee Directors |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense | 8 | 71 | 8 | 71 |
Selling, General and Administrative Expenses | DLH Employees |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total compensation expense | 56 | 6 | 63 | 14 |
Selling, General and Administrative Expenses | Non-employee Directors |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total compensation expense | $ 8 | $ 4 | 486 | 328 |
Restricted Stock [Member] | Non-employee Directors |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total compensation expense |  |  | $ 456 | $ 304 |
Long Term Incentive Plan 2006 | Employee Stock Option |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Number of shares available for grant |  |  |  |  | 0.5
Expiration term |  |  | 10 years |  |

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