Segment Reporting and Geographic Information (External Revenue and Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 42,714	$ 43,124	$ 81,487	$ 85,442
Long-Lived Assets	4,605		4,605		$ 4,890
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	2,815		2,815		3,078
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	13,613	13,555	23,865	26,411
Americas (Excluding the U.S.) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,857	126	4,620	682
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	23,494	26,522	44,310	53,101
Long-Lived Assets	1,767		1,767		1,786
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,200	21,400	35,400	41,800
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,750	2,921	8,692	5,248
Long-Lived Assets	23		23		$ 26
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 3,200	$ 2,400	$ 7,700	$ 4,000