Segment Reporting and Geographic Information (External Revenue and Long-Lived Assets by Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 43,170	$ 38,385	$ 128,612	$ 115,465
Long-Lived Assets	5,159		5,159		5,555
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	3,256		3,256		3,326
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	13,254	15,010	39,665	40,811
Americas (Excluding the U.S.) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	197	972	879	3,452
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	25,553	21,275	78,653	66,565
Long-Lived Assets	1,874		1,874		2,194
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	21,200	16,000	63,000	51,500
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,166	1,128	9,415	4,637
Long-Lived Assets	$ 29		$ 29		$ 35