Business Acquisition (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Business Acquisition [Line Items]
Liabilities for contingent consideration related to post closing milestones	$ 0	$ 990,000
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			2,400,000
Payment related to contingent consideration	600,000	700,000
Decreased fair value of liability	400,000	700,000
Business acquisition purchase price allocation for goodwill		11,600,000	11,600,000
Identifiable intangible assets		$ 2,800,000	$ 2,800,000