Segment And Geographic Information (Schedule Of Geographic Allocation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 81,506	$ 66,966
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	35,443	21,051
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,544	6,345
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,939	4,531
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,514	5,641
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,375	3,500
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,490	11,331
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,445	8,856
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 2,756	$ 5,711