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Stock-based Compensation and Equity Grants - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Selling, General and Administrative Expenses |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total compensation expense |  |  | $ 910 | $ 790
DLH employees |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense for DLH employees |  |  | $ 2,633 | 631
Weighted average period for recognition of compensation expense |  |  | 4 years 6 months 29 days |
DLH employees | Selling, General and Administrative Expenses |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total compensation expense |  |  | $ 563 | 263
Non-employee directors | Restricted Stock Units |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Number of restricted stock units issued (in shares) | 63,177 | 90,000 |  |
Number of restricted stocks vested in period (in shares) |  |  | 90,000 |
Non-employee directors | Selling, General and Administrative Expenses |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total compensation expense |  |  | $ 347 | $ 527

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