Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Payables and Accruals [Abstract]
Direct costs of sales	$ 2,908	$ 4,450
Payroll and related costs	3,543	3,086
Accrued corporate cost expenses	1,328	3,167
Asset retirement obligations	990	571
Contract termination costs	212
Interest payable - cash	165	102
Other creditors	4,240	2,978
Accrued expenses, net	$ 13,386	$ 14,354