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Stock Option Plans and Share-Based Compensation Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2010
2009 Equity Incentive Plan [Member]
Mar. 31, 2013
2009 Equity Incentive Plan [Member]
May 19, 2009
2009 Equity Incentive Plan [Member]
Dec. 31, 2012
2009 Equity Incentive Plan [Member]
Stock Options [Member]
VestingInstallment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         2,100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Not Available for Grant For Each Share Granted     0 1.40    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     2,600,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Monthly Vesting Installments After Initial Cliff           36
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years
Common Stock, Capital Shares Reserved for Future Issuance 1,107,858          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options   $ 7.0        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 9 months 18 days