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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