Subsequent Events (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Dec. 01, 2017	Nov. 10, 2017	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Number of incentive stocks granted (in shares)				400,000	25,000
Subsequent Event | 2016 Omnibus Equity Incentive Plan
Subsequent Event [Line Items]
Number of incentive stocks granted (in shares)	217,500
Subsequent Event | Non-employee directors
Subsequent Event [Line Items]
Shares issued (in shares)		93,125
Share-based compensation expense recognized			$ 563