Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segment	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments			1
Net revenue	$ 50,683	$ 47,708	$ 95,163	$ 102,306
United States
Segment Reporting Information [Line Items]
Net revenue	50,518	47,346	94,682	101,433
Europe
Segment Reporting Information [Line Items]
Net revenue	1	4	2	9
Asia
Segment Reporting Information [Line Items]
Net revenue	$ 164	$ 358	$ 479	$ 864