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Fair Value of Financial Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Fair Value Measurements (Textual) [Abstract]        
Average remaining maturity of the Company's Level 2 investments less than six months      
Fair value assumptions estimated time to liquidity event     13 months 24 months
Fair Value Measurements (Additional Textual) [Abstract]        
Estimated total enterprise value $ 178.9 $ 106.9    
Risk-adjusted discount used in PWERM 14.00%      
Non-marketability discount 23.00%      
Percentage of weight assigned to initial public offering 60.00%      
Percentage of weight assigned to private offering 30.00%      
Percentage of weight assigned to sale 10.00%