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Stock-based Compensation, Equity Grants, and Warrants - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total unrecognized expense | $ 1,094 |  |  | $ 1,094 |
Weighted average share based compensation expense recognition period |  |  |  | 3 years 9 months 25 days |
Selling, General and Administrative Expenses |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock option expense | 182 |  | $ 199 | $ 566 | $ 591
DLH employees |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total unrecognized expense | 1,007 |  |  | 1,007 |
DLH employees | Selling, General and Administrative Expenses |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock option expense | 95 |  | 67 | 306 | 196
Non-employee directors |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total unrecognized expense | 87 |  |  | 87 |
Non-employee directors | Restricted Stock Units |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Number of restricted stock units granted (in shares) |  | 77,500 |  |  |
Non-employee directors | Selling, General and Administrative Expenses |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total stock option expense | $ 87 |  | $ 132 | $ 260 | $ 395

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