Segment And Geographic Information (Schedule Of Geographic Allocation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total revenue	$ 78,472	$ 66,117	$ 217,080	$ 183,975
United States [Member]
Total revenue	35,290	15,726	82,444	27,184
France [Member]
Total revenue	6,389	6,436	19,417	19,430
Japan [Member]
Total revenue	4,809	6,119	15,250	19,079
Switzerland [Member]
Total revenue	4,382	4,887	13,536	14,100
Korea [Member]
Total revenue	3,235	4,449	10,102	13,886
Other Asia [Member]
Total revenue	12,663	15,665	40,225	51,714
Other Europe [Member]
Total revenue	8,812	9,447	26,915	27,527
Other International [Member]
Total revenue	$ 2,892	$ 3,388	$ 9,191	$ 11,055