Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of reportable segments									1
Net revenue	$ 58,799	$ 52,603	$ 50,683	$ 44,480	$ 44,019	$ 48,223	$ 47,708	$ 54,598	$ 206,565	$ 194,548	$ 195,827
Long-Lived Assets	8,162				7,750				8,162	7,750	7,867
United States
Segment Reporting Information [Line Items]
Net revenue									204,764	192,801	193,755
Long-Lived Assets	8,147				7,682				8,147	7,682	4,945
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Net revenue									3	14	76
Long-Lived Assets	15				68				15	68	2,922
Asia
Segment Reporting Information [Line Items]
Net revenue									1,798	1,733	1,996
Long-Lived Assets	$ 0				$ 0				$ 0	$ 0	$ 0