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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Options          
Stock-Based Compensation          
Unamortized compensation cost, net of expected forfeitures $ 3,400,000     $ 3,400,000  
Weighted average expected period over which the expense is to be recognized       2 years 3 months 18 days  
Tax benefits associated with exercise of stock options $ 0   $ 0 $ 0 $ 0
Inducement grant options          
Available for Grant          
Balance at the beginning of the year (in dollars per share) $ 3.68        
Number of Shares          
Balance at the beginning of the year (in shares) 2,233        
Options cancelled (in shares) (2)        
Options exercised (in shares) (512)        
Options expired (in shares) (16)        
Balance at the end of the year (in shares) 1,703 2,233   1,703  
Weighted Average Exercise Prices          
Options cancelled (in dollars per share) $ 3.86        
Options exercised (in dollars per share) 1.55        
Options expired (in dollars per share) 1.55        
Balance at the end of the year (in dollars per share) $ 4.34 $ 3.68   $ 4.34  
RSU's          
Stock-Based Compensation          
Weighted average expected period over which the expense is to be recognized       1 year 9 months 18 days  
Unamortized compensation cost for awards other than options, net of expected forfeitures $ 800,000     $ 800,000  
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  
Plans | Options          
Available for Grant          
Balance at the beginning of the year (in shares) 1,018 1,760   1,760  
Balance at the beginning of the year (in dollars per share) $ 3.52 $ 3.87   $ 3.87  
Additional shares authorized under the Amended 2010 Plan   500      
Restricted stock units cancelled (in shares) 10 6      
Options granted (in shares) (95) (1,323)      
Options cancelled (in shares) 128 153      
Options expired (in shares) (15) (78)      
Balance at the end of the year (in shares) 1,046 1,018   1,046  
Number of Shares          
Balance at the beginning of the year (in shares) 7,142 5,994   5,994  
Options granted (in shares) 95 1,323      
Options cancelled (in shares) (128) (153)      
Options exercised (in shares) (40) (22)      
Balance at the end of the year (in shares) 7,069 7,142   7,069  
Weighted Average Exercise Prices          
Options granted (in dollars per share) $ 2.04 $ 2.05      
Options cancelled (in dollars per share) 4.00 5.00      
Options exercised (in dollars per share) 1.65 1.60      
Options expired (in dollars per share) 4.35 5.79      
Balance at the end of the year (in dollars per share) $ 3.50 $ 3.52   $ 3.50  
Plans | RSU's          
Available for Grant          
Restricted stock units cancelled (in shares) 10 6