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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
May. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation        
Stock-based compensation expense   $ 5,733 $ 4,055 $ 5,744
2013 Plan        
Stock-Based Compensation        
Number of shares authorized under the plan 5,000,000.0      
2005 Plan        
Stock-Based Compensation        
Number of additional awards to be granted 0      
Stock Option        
Number of Shares        
Options outstanding at the beginning of the period (in shares)   4,464,021 4,245,712 5,106,629
Granted (in shares)   1,973,606 1,002,955 1,138,600
Exercised (in shares)   (35,000) (78,125) (151,875)
Unvested options forfeited (in shares)   (660,733) (437,984) (762,062)
Vested options expired (in shares)   (1,139,148) (268,537) (1,085,580)
Options outstanding at the end of the period (in shares)   4,602,746 4,464,021 4,245,712
Exercisable (in shares)   1,779,288    
Weighted-Average Option Price        
Options outstanding at the beginning of the period (in dollars per share)   $ 11.50 $ 13.65 $ 14.32
Granted (in dollars per share)   5.73 8.01 8.30
Exercised (in dollars per share)   6.04 6.19 6.04
Unvested options forfeited (in dollars per share)   7.96 8.72 11.97
Vested options expired (in dollars per share)   14.89 17.83 13.47
Options outstanding at the end of the period (in dollars per share)   8.74 $ 11.50 $ 13.65
Exercisable (in dollars per share)   $ 12.73    
Weighted-Average Remaining Contractual Term        
Options outstanding at the end of the period   6 years 1 month 17 days    
Exercisable at the end of the period   3 years 11 months 27 days    
Aggregate Intrinsic Value        
Exercised (in dollars)   $ 67 $ 61 $ 268
Options outstanding at the end of the period (in dollars)   0    
Options exercisable at the end of the period (in dollars)   $ 0    
Stock Option | Inducement Awards        
Number of Shares        
Options outstanding at the end of the period (in shares)   1,000,000    
Stock Option | Inducement Awards | Minimum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 3.79    
Stock Option | Inducement Awards | Maximum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 4.26    
Stock Option | 2013 Plan        
Stock-Based Compensation        
Shares available for grant   3,200,000    
Expiration term   10 years    
Number of Shares        
Options outstanding at the end of the period (in shares)   1,400,000    
Stock Option | 2013 Plan | Minimum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 4.67    
Stock Option | 2013 Plan | Maximum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 8.85    
Stock Option | 2005 Plan        
Stock-Based Compensation        
Expiration term   10 years    
Number of Shares        
Options outstanding at the end of the period (in shares)   2,300,000    
Stock Option | 2005 Plan | Prior to 2011        
Stock-Based Compensation        
Expiration term   10 years    
Stock Option | 2005 Plan | Minimum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 6.04    
Stock Option | 2005 Plan | Maximum        
Weighted-Average Option Price        
Options outstanding at the end of the period (in dollars per share)   $ 27.00    
First Vesting Increment | Stock Option | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
First Vesting Increment | Stock Option | 2013 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
First Vesting Increment | Stock Option | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
First Vesting Increment | Stock Option | 2005 Plan | Prior to 2011        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
First Vesting Increment | Restricted Stock Units | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
First Vesting Increment | Restricted Stock Units | 2013 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
First Vesting Increment | Restricted Stock Units | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Second Vesting Increment | Stock Option | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Second Vesting Increment | Stock Option | 2013 CEO Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Second Vesting Increment | Stock Option | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Second Vesting Increment | Restricted Stock Units | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Second Vesting Increment | Restricted Stock Units | 2013 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Second Vesting Increment | Restricted Stock Units | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Third Vesting Increment | Stock Option | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Third Vesting Increment | Stock Option | 2013 CEO Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Third Vesting Increment | Stock Option | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Third Vesting Increment | Restricted Stock Units | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Third Vesting Increment | Restricted Stock Units | 2013 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Third Vesting Increment | Restricted Stock Units | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   33.00%    
Fourth Vesting Increment | Stock Option | Inducement Awards        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Fourth Vesting Increment | Stock Option | 2013 CEO Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%    
Fourth Vesting Increment | Stock Option | 2005 Plan        
Aggregate Intrinsic Value        
Award vesting percentage by year   25.00%