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Business Combinations (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2011
Apr. 30, 2011
Privately-held company
Apr. 04, 2011
Privately-held company
Apr. 04, 2011
Privately-held company
Core technology
Business combination        
Cash paid to acquire a privately-held company     $ 28,300,000  
Definite-lived intangibles     16,400,000 13,600,000
Goodwill $ 14,661,000 $ 14,700,000