Business Acquisition (Details) (USD $)			3 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Velocitude [Member]	Jun. 30, 2010 Velocitude [Member]
Business Acquisition [Line Items]
Cost of acquisition of all assets and liabilities				$ 12,000,000
Liabilities for contingent consideration related to post closing milestones	0	990,000		2,400,000
Cash payment for achievement of post closing milestones	0	990,000		2,400,000
Final payment related to contingent consideration			400,000
Business acquisition purchase price allocation for goodwill			11,600,000
Identifiable intangible assets			$ 2,800,000