Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Components of Accrued liabilities
Accrued employee compensation and benefits	$ 3,864	$ 4,309
Accrued income taxes	72	901
Other accrued liabilities	1,171	1,581
Total accrued liabilities	$ 5,107	$ 6,791