Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 segment	Sep. 30, 2011
Segment Reporting Information [Line Items]
Number of reportable segments			1
Net revenue	$ 48,223	$ 47,805	$ 150,529	$ 148,806
United States
Segment Reporting Information [Line Items]
Net revenue	47,737	47,197	149,169	146,910
Europe
Segment Reporting Information [Line Items]
Net revenue	3	11	12	70
Asia
Segment Reporting Information [Line Items]
Net revenue	$ 483	$ 597	$ 1,348	$ 1,826