Description Of The Business (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Net loss	$ (11,746)	$ (10,761)	$ (33,183)	$ (28,592)
Cash used in operating activities			(24,989)	$ (17,588)
Accumulated deficit	$ (108,901)		$ (108,901)		$ (75,718)