Segment and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Revenues:
Total revenue	$ 40,516	$ 32,179	$ 78,859	$ 61,833
Long-Lived Assets, net
Total Long-Lived Assets, net	12,977		12,977		10,623
United States [Member]
Revenues:
Total revenue	23,041	20,801	48,870	37,873
Long-Lived Assets, net
Total Long-Lived Assets, net	11,946		11,946		9,603
EMEA [Member]
Revenues:
Total revenue	9,756	4,898	15,502	9,645
Long-Lived Assets, net
Total Long-Lived Assets, net	355		355		269
APAC [Member]
Revenues:
Total revenue	3,478	3,809	8,531	7,382
Long-Lived Assets, net
Total Long-Lived Assets, net	156		156		155
Other [Member]
Revenues:
Total revenue	4,241	2,671	5,956	6,933
Long-Lived Assets, net
Total Long-Lived Assets, net	$ 520		$ 520		$ 596