Share-based compensation (Schedule Of Stock Option Activity) (Details) (MVIS, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
MVIS
Options, Outstanding as of beginning of period	1,318,000	964,000
Options, Granted	824,000	671,000
Options, Exercised	(23,000)	(16,000)
Options, Forfeited, cancelled or expired	(214,000)	(301,000)
Options, Outstanding as of end of period	1,905,000	1,318,000
Weighted-Average Exercise Prices, Outstanding as of beginnig of period	$ 13.71	$ 24.00
Weighted-Average Exercise Prices, Granted	$ 2.22	$ 1.97
Weighted-Average Exercise Prices, Exercised	$ 1.80	$ 1.80
Weighted-Average Exercise Prices, Forfeited, cancelled or expired	$ 13.86	$ 21.20
Weighted-Average Exercise Prices, Outstanding as of end of period	$ 8.86	$ 13.71
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7.4	6.8	5.8
Options, Outstanding, Aggregate Intrinsic Value	$ 1,500	$ 0	$ 0
Options, Vested and expected to vest at end of period	1,797,000
Weighted-Average Exercise Price, Vested and expected to vest	$ 9.26
Weighted-Average Remaining Contractual Term (in years), Vested and expected to vest	7.3
Options, Vested and expected to vest, Aggregate Intrinsic Value	1,443
Options, Exercisable at end of period	934,000
Weighted-Average Exercise Price, Exercisable	$ 15.41
Weighted-Average Remaining Contractual Term (in years), Exercisable	5.6
Options, Exercisable, Aggregate Intrinsic Value	750
Options, Exercises in Period, Intrinsic Value	21,000	13,000
Options, Vested, Aggregate Intrinsic Value		$ 1,700,000	$ 2,500,000