Share-based compensation (Schedule Of Stock Option Activity) (Details) (MVIS, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MVIS
Options, Outstanding as of beginning of period	1,905,000	1,318,000
Options, Granted	717,000	824,000
Options, Exercised	(16,000)	(23,000)
Options, Forfeited, cancelled or expired	(301,000)	(214,000)
Options, Outstanding as of end of period	2,427,000	1,905,000
Weighted-Average Exercise Prices, Outstanding as of beginnig of period	$ 8.86	$ 13.71
Weighted-Average Exercise Prices, Granted	$ 1.78	$ 2.22
Weighted-Average Exercise Prices, Exercised	$ 0	$ 1.80
Weighted-Average Exercise Prices, Forfeited, cancelled or expired	$ 9.49	$ 13.86
Weighted-Average Exercise Prices, Outstanding as of end of period	$ 6.72	$ 8.86
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years 146 days	7 years 146 days
Options, Outstanding, Aggregate Intrinsic Value	$ 18,700	$ 1,500	$ 0
Options, Vested and expected to vest at end of period	2,293,000
Weighted-Average Exercise Price, Vested and expected to vest	$ 7.00
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest	7 years 110 days
Options, Vested and expected to vest, Aggregate Intrinsic Value	18,100
Options, Exercisable at end of period	1,263,000
Weighted-Average Exercise Price, Exercisable	$ 11.06
Weighted-Average Remaining Contractual Term (in years), Exercisable	5 years 329 days
Options, Exercisable, Aggregate Intrinsic Value	14,100
Options, Exercises in Period, Intrinsic Value		21,000
Grant date fair value of options vested	$ 3,300,000	$ 1,700,000