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Stock-based Compensation, Equity Grants, and Warrants - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock option expense $ 199 $ 171 $ 392 $ 928
Number of options granted (in shares)     35,000  
Total unrecognized expense 1,029   $ 1,029  
Weighted average share based compensation expense recognition period     3 years 4 months 2 days  
DLH employees        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Number of options granted (in shares)     35,000  
DLH employees | Selling, General and Administrative Expenses        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock option expense 67 67 $ 129 131
Total unrecognized expense $ 766   766  
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) 90,000      
Non-employee directors | Selling, General and Administrative Expenses        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock option expense $ 132 $ 104 263 $ 797
Total unrecognized expense $ 263   $ 263