Nature of Operations, Management's Plans and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Cash on hand	$ 33.7		$ 22.5	$ 10.2		$ 11.0	$ 33.7	$ 10.2	$ 22.5
Working capital							11.3
Net loss	10.7	$ 5.0	$ 4.7	$ 4.0	$ 0.5	$ 4.2	15.7	$ 4.5
Earnout liability									8.0
Deferred revenue, current	10.2						10.2		$ 9.2
Greece [Member]
Cash on hand	$ 2.9						$ 2.9