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Stock-Based Compensation - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Options    
Stock-Based Compensation    
Unamortized compensation cost, net of expected forfeitures $ 1,900,000  
Weighted average expected period over which the expense is to be recognized 1 year 10 months 24 days  
Tax benefits associated with exercise of stock options $ 0 $ 0
Inducement grant options    
Number of Shares    
Balance at the beginning of the period (in shares) 1,640  
Options cancelled (in shares) (139)  
Balance at the end of the period (in shares) 1,501  
Weighted Average Exercise Prices    
Balance at the beginning of the year (in dollars per share) $ 4.37  
Options cancelled (in dollars per share) 3.87  
Balance at the end of the year (in dollars per share) $ 4.42  
RSU's    
Stock-Based Compensation    
Weighted average expected period over which the expense is to be recognized 1 year 2 months 12 days  
Unamortized compensation cost for awards other than options, net of expected forfeitures $ 400,000  
RSU's | Minimum    
Stock-Based Compensation    
Stock-based compensation expense, recognition period 3 years  
RSU's | Maximum    
Stock-Based Compensation    
Stock-based compensation expense, recognition period 5 years  
Amended 2010 Plan    
Available for Grant    
Additional shares authorized 500  
The Plans    
Available for Grant    
Balance at the beginning of the year (in shares) 1,059  
Options cancelled (in shares) 313  
Balance at the end of the year (in shares) 1,886  
Number of Shares    
Balance at the beginning of the period (in shares) 6,749  
Options cancelled (in shares) (313)  
Balance at the end of the period (in shares) 6,436  
Weighted Average Exercise Prices    
Balance at the beginning of the year (in dollars per share) $ 3.51  
Options cancelled (in dollars per share) 3.53  
Balance at the end of the year (in dollars per share) $ 3.51  
The Plans | RSU's    
Available for Grant    
Restricted stock units cancelled (in shares) 14