Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Customer prepayments and deposits	$ 3,617	$ 3,719
Fair value of hedging instrument		132
Total other liabilities, current	3,617	3,851
Other payables, net of current portion	126	511
Asset retirement obligation	316	323
Senior debt exit premium	4,200	4,200
Total other liabilities, long-term	4,642	5,034
Other liabilities	$ 8,259	$ 8,885