Long-term Debt - Capital Leases (Details) ft² in Thousands, $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Oct. 31, 2017 ft²	Sep. 30, 2017 ft²
Office Building
Property, Plant and Equipment [Line Items]
Area of of real property | ft²				122
Manufacturing Facility
Property, Plant and Equipment [Line Items]
Area of of real property | ft²			136
Scenario, Forecast | Office Building
Property, Plant and Equipment [Line Items]
Term of capital lease contract		20 years
Future minimum payments		$ 47.8
Present value of net minimum payments		$ 24.9
Scenario, Forecast | Manufacturing Facility
Property, Plant and Equipment [Line Items]
Term of capital lease contract	31 years
Future minimum payments	$ 35.0
Present value of net minimum payments	$ 21.0