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Accounting for Shared-Based Payments - Stock option activity (Details) - USD ($)
12 Months Ended 122 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Weighted Average Remaining Contractual Term          
Stock based compensation expense $ 9,724,000 $ 4,722,000 $ 4,614,000    
Amount of excess tax benefits recognized (in dollars) $ 0        
Number of options with vesting contingent 2,159,500        
Stock options | Contingent vesting          
Weighted Average Remaining Contractual Term          
Grant date fair value $ 28,564,103       $ 28,564,103
Stock based compensation expense         $ 0
Stock options | Exercise Price Range $0.50 - $5.20          
Number of Options          
Balance outstanding, beginning of period (in shares)     9,734,268    
Balance outstanding, end of period (in shares)       9,734,268  
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)       $ 0.50  
Exercise price, high end of the range (in dollars per share)       5.20  
Weighted Average Exercise Price Per Share          
Balance outstanding, end of period (in dollars per share)       $ 2.75  
Intrinsic Value          
Intrinsic value of options outstanding (in dollars)       $ 24,482,000  
Weighted Average Remaining Contractual Term          
Balance at the end of the period       8 years 1 month 6 days  
Stock options | Exercise Price Range $0.44 - $20.01          
Number of Options          
Balance outstanding, beginning of period (in shares)   11,324,049      
Granted (in shares)     2,545,965    
Balance outstanding, end of period (in shares)     11,324,049    
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)     $ 0.44    
Exercise price, high end of the range (in dollars per share)     20.01    
Weighted Average Exercise Price Per Share          
Granted (in dollars per share)     6.41    
Balance outstanding, end of period (in dollars per share)     $ 3.31    
Intrinsic Value          
Intrinsic value of options outstanding (in dollars)     $ 37,521,000    
Weighted Average Remaining Contractual Term          
Balance at the end of the period     6 years 11 months 9 days    
Stock options | Exercise Price Range $0.50 - $4.28          
Number of Options          
Exercised (in shares)     (61,787)    
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)     $ 0.50    
Exercise price, high end of the range (in dollars per share)     4.28    
Weighted Average Exercise Price Per Share          
Exercised (in dollars per share)     $ 1.91    
Intrinsic Value          
Intrinsic value of options exercised (in dollars)     $ 221,000    
Stock options | Exercise Price Range $4.42 - $13.90          
Number of Options          
Forfeited (in shares)     (894,397)    
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)     $ 4.42    
Exercise price, high end of the range (in dollars per share)     13.90    
Weighted Average Exercise Price Per Share          
Forfeited (in dollars per share)     $ 6.05    
Stock options | Exercise Price Range $2.83 - $4.24          
Number of Options          
Granted (in shares)   5,528,000      
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)   $ 2.83      
Exercise price, high end of the range (in dollars per share)   4.24      
Weighted Average Exercise Price Per Share          
Granted (in dollars per share)   $ 3.47      
Stock options | Exercise Price Range $3.40 - $3.95          
Number of Options          
Exercised (in shares)   (9,999)      
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)   $ 3.40      
Exercise price, high end of the range (in dollars per share)   3.95      
Weighted Average Exercise Price Per Share          
Exercised (in dollars per share)   $ 3.58      
Intrinsic Value          
Intrinsic value of options exercised (in dollars)   $ 25,000      
Stock options | Exercise Price Range $4.24 - $20.01          
Number of Options          
Forfeited (in shares)   (275,030)      
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)   $ 4.24      
Exercise price, high end of the range (in dollars per share)   20.01      
Weighted Average Exercise Price Per Share          
Forfeited (in dollars per share)   $ 13.42      
Stock options | Exercise Price Per Share $0.44 - $17.79          
Number of Options          
Balance outstanding, beginning of period (in shares) 16,567,020        
Balance outstanding, end of period (in shares)   16,567,020      
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share)   $ 0.44      
Exercise price, high end of the range (in dollars per share)   17.79      
Weighted Average Exercise Price Per Share          
Balance outstanding, end of period (in dollars per share)   $ 3.20      
Intrinsic Value          
Intrinsic value of options outstanding (in dollars)   $ 8,949,000      
Weighted Average Remaining Contractual Term          
Balance at the end of the period   7 years 3 months 15 days      
Stock options | Exercise Price Per Share $2.94 - $9.33          
Number of Options          
Granted (in shares) 4,961,112        
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share) $ 2.94        
Exercise price, high end of the range (in dollars per share) 9.33        
Weighted Average Exercise Price Per Share          
Granted (in dollars per share) $ 6.51        
Stock options | Exercise Price Per Share $2.98 - $6.28          
Number of Options          
Exercised (in shares) (269,720)        
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share) $ 2.98        
Exercise price, high end of the range (in dollars per share) 6.28        
Weighted Average Exercise Price Per Share          
Exercised (in dollars per share) $ 4.24        
Intrinsic Value          
Intrinsic value of options exercised (in dollars) $ 904,000        
Stock options | Exercise Price Per Share $2.98 - $9.45          
Number of Options          
Forfeited (in shares) (305,037)        
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share) $ 2.98        
Exercise price, high end of the range (in dollars per share) 9.45        
Weighted Average Exercise Price Per Share          
Forfeited (in dollars per share) $ 6.22        
Stock options | Exercise Price Per Share $0.44 - $9.12          
Number of Options          
Balance outstanding, end of period (in shares) 20,953,375       20,953,375
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share) $ 0.44        
Exercise price, high end of the range (in dollars per share) 9.12        
Weighted Average Exercise Price Per Share          
Balance outstanding, end of period (in dollars per share) $ 3.86       $ 3.86
Intrinsic Value          
Intrinsic value of options outstanding (in dollars) $ 42,438,000       $ 42,438,000
Weighted Average Remaining Contractual Term          
Balance at the end of the period 7 years 1 month 24 days        
Stock options | Exercise Price per share $0.44 - 7.91          
Number of Options          
Exercisable at the end of the period (in shares) 9,858,717       9,858,717
Exercise Price Per Share          
Exercise price, low end of the range (in dollars per share) $ 0.44        
Exercise price, high end of the range (in dollars per share) 7.91        
Weighted Average Exercise Price Per Share          
Exercisable at the end of the period (in dollars per share) $ 3.28       $ 3.28
Intrinsic Value          
Intrinsic value of options exercisable (in dollars) $ 23,668,000       $ 23,668,000
Weighted Average Remaining Contractual Term          
Exercisable at the end of the period 6 years 7 days