Revenue (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Deferred Revenue, Revenue Recognized	$ 0.5	$ 0.4	$ 0.9	$ 3.6
Capitalized Contract Cost, Net	9.1		$ 9.1		$ 9.4
capitalized contract costs amortization period			25 years
Capitalized Contract Cost, Amortization	$ 0.1	$ 0.1	$ 0.3	$ 0.3