Stock-based Compensation and Equity Grants - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 09, 2018	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted average period for recognition of compensation expense			4 years 1 month 21 days
Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense			$ 790	$ 1,375
Unrecognized expense for DLH employees			631	876
DLH employees | Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense			263	266
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)		90,000
Non-employee directors | Common Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of common stock issued (in shares)	101,667
Non-employee directors | Selling, General and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total compensation expense			$ 527	$ 1,109