Restructuring (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2018 USD ($) employee	Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Reduction in operating costs | $	$ 3.0
Expected percentage of positions eliminated	20.00%
Restructuring charges | $		$ 0.9
Minimum
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | employee	35
Maximum
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | employee	40