Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Customer prepayments and deposits	$ 2,939	$ 3,719
Fair value of hedging instrument		132
Total other liabilities, current	2,939	3,851
Other payables, net of current portion		511
Asset retirement obligation	253	323
Contract termination costs	78
Senior debt exit premium	4,200	4,200
Total other liabilities, long-term	4,531	5,034
Other liabilities	$ 7,470	$ 8,885