Share-based compensation (Schedule Of Stock Option Activity) (Details) - MVIS - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options, Outstanding as of beginning of period	3,146	2,427	1,905
Options, Granted	1,167	849	717
Options, Exercised	(3)	(23)	0
Options, Forfeited, or expired	(307)	(107)	(195)
Options, Outstanding as of end of period	4,003	3,146	2,427
Weighted-Average Exercise Prices, Outstanding as of beginnig of period	$ 5.56	$ 6.72	$ 8.86
Weighted-Average Exercise Prices, Granted	1.83	3.23	1.78
Weighted-Average Exercise Prices, Exercised	1.77	1.88	0
Weighted-Average Exercise Prices, Forfeited, cancelled or expired	12.58	13.98	9.49
Weighted-Average Exercise Prices, Outstanding as of end of period	$ 3.94	$ 5.56	$ 6.72
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years 108 days	7 years 108 days	7 years 144 days
Options, Outstanding, Aggregate Intrinsic Value	$ 4	$ 1,613	$ 18,700	$ 1,500
Options, Vested and expected to vest at end of period	3,747
Weighted-Average Exercise Price, Vested and expected to vest	$ 4.06
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest	7 years 72 days
Options, Vested and expected to vest, Aggregate Intrinsic Value	$ 3
Options, Exercisable at end of period	2,032
Weighted-Average Exercise Price, Exercisable	$ 5.61
Weighted-Average Remaining Contractual Term (in years), Exercisable	5 years 288 days
Options, Exercisable, Aggregate Intrinsic Value	$ 0
Options, Exercises in Period, Intrinsic Value	3	29	0
Grant date fair value of options vested	$ 998	$ 591	$ 3,300