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Accounting for Shared-Based Payments (Details 2) (Stock options, USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jan. 17, 2013
Callisto
Jun. 30, 2013
Callisto
Dec. 31, 2012
Exercise price per Share 0.50 - 5.20
Jun. 30, 2013
Exercise price per Share 0.44 - 20.01
Jun. 30, 2013
Exercise price per Share 0.44 - 20.01
Maximum
Jun. 30, 2013
Exercise price per Share 0.44 - 20.01
Minimum
Jun. 30, 2013
Exercise price per Share 0.44 - 4.28
Jun. 30, 2013
Exercise price per Share 0.44 - 4.28
Maximum
Jun. 30, 2013
Exercise price per Share 0.44 - 4.28
Minimum
Jun. 30, 2013
Exercise price per Share 4.42 - 12.51
Jun. 30, 2013
Exercise price per Share 4.42 - 12.51
Maximum
Jun. 30, 2013
Exercise price per Share 4.42 - 12.51
Minimum
Shared-based payments                        
Options outstanding (in shares)     9,734,268 10,463,063                
Granted (in shares) 1,221,316     1,589,316                
Exercised (in shares)             (61,787)          
Forfeited (in shares)   (298,734)               (798,734)    
Exercisable at the end of the period (in shares)       3,591,494                
Exercise Price Per Share                        
Exercise price, low end of the range (in dollars per share)     $ 0.50 $ 0.44     $ 0.44     $ 4.42    
Exercise price, high end of the range (in dollars per share)     $ 5.20 $ 20.01     $ 4.28     $ 12.51    
Granted (in dollars per share)         $ 20.01 $ 0.44            
Exercised (in dollars per share)               $ 4.28 $ 0.44      
Forfeited (in dollars per share)                     $ 12.51 $ 4.42
Exercisable at the end of the period (in dollars per share)         $ 20.01 $ 0.44            
Weighted average exercise price per share of outstanding options (in dollars per share)     $ 2.75 $ 3.25                
Granted (in dollars per share)       $ 7.62                
Exercised (in dollars per share)             $ 1.91          
Forfeited (in dollars per share)                   $ 5.85    
Exercisable at the end of the period (in dollars per share)       $ 2.68                
Intrinsic Value                        
Intrinsic value of options outstanding (in dollars)     $ 24,482 $ 16,649                
Intrinsic value of options exercisable (in dollars)       $ 8,472                
Weighted Average Remaining Contractual Term                        
Balance at the end of the period     6 years 5 months 12 days 7 years 2 months 12 days                
Exercisable at the end of the period       5 years 6 months                
Additional disclosures                        
Vested (in shares)   711,293