Share-based compensation (Schedule Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sharebased Compensation Schedule Of Stock Option Activity Legal Entity Details Abstract
Options, Outstanding as of beginning of period	5,034	4,003
Options, Granted	1,229	1,724
Options, Exercised	0	(46)
Options, Forfeited, or expired	(1,617)	(647)
Options, Outstanding as of end of period	4,646	5,034
Weighted-Average Exercise Prices, Outstanding as of beginnig of period	$ 2.94	$ 3.94
Weighted-Average Exercise Prices, Granted	1.16	1.76
Weighted-Average Exercise Prices, Exercised	0	1.87
Weighted-Average Exercise Prices, Forfeited, cancelled or expired	3.51	6.09
Weighted-Average Exercise Prices, Outstanding as of end of period	$ 2.27	$ 2.94
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years	6 years 216 days
Options, Outstanding, Aggregate Intrinsic Value	$ 0	$ 53	$ 4
Options, Vested and expected to vest at end of period	4,364
Weighted-Average Exercise Price, Vested and expected to vest	$ 3.04
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest	6 years 288 days
Options, Vested and expected to vest, Aggregate Intrinsic Value	$ 0
Options, Exercisable at end of period	2,252
Weighted-Average Exercise Price, Exercisable	$ 2.30
Weighted-Average Remaining Contractual Term (in years), Exercisable	5 years
Options, Exercisable, Aggregate Intrinsic Value	$ 0
Options, Exercises in Period, Intrinsic Value		40
Grant date fair value of options vested	$ 958	$ 1,000