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Stock-based Compensation, Equity Grants, and Warrants - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock option expense $ 193 $ 757  
Total unrecognized expense $ 1,094   $ 1,076
Weighted average share based compensation expense recognition period 2 years 11 months 8 days    
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    
DLH employees | Selling, General and Administrative Expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock option expense $ 62 64  
Total unrecognized expense 699   1,076
Non-employee directors | Selling, General and Administrative Expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock option expense 131 $ 693  
Total unrecognized expense $ 395   $ 0