Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of net services revenue
Total net services revenue	$ 11,667	$ 8,274	$ 31,643	$ 22,166
Maintenance and support [Member]
Components of net services revenue
Total net services revenue	8,582	6,452	24,072	17,766
Professional services and training [Member]
Components of net services revenue
Total net services revenue	1,749	1,418	4,589	3,478
Subscriptions [Member]
Components of net services revenue
Total net services revenue	$ 1,336	$ 404	$ 2,982	$ 922