Segment And Geographic Information (Schedule Of Geographic Allocation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 82,692	$ 71,642	$ 164,198	$ 138,608
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	29,567	22,137	60,077	39,379
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,238	7,349	16,662	14,309
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	6,413	5,060	11,905	10,009
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,036	5,273	10,067	11,438
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,012	4,286	9,324	8,640
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,497	3,703	8,265	7,542
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,715	10,648	21,463	21,291
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	11,276	10,303	21,089	20,188
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,938	$ 2,883	$ 5,346	$ 5,812