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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Options              
Stock-Based Compensation              
Unamortized compensation cost, net of expected forfeitures $ 2,900,000         $ 2,900,000  
Weighted average expected period over which the expense is to be recognized           2 years 2 months 12 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) $ 4.34 $ 3.68          
Number of Shares              
Balance at the beginning of the period (in shares) 1,703 2,233          
Options cancelled (in shares) (28)       (2)    
Options exercised (in shares) (6)       (512)    
Options expired (in shares)         (16)    
Balance at the end of the period (in shares) 1,669 1,703 2,233   1,703 1,669  
Weighted Average Exercise Prices              
Options cancelled (in dollars per share) $ 3.57       $ 3.86    
Options exercised (in dollars per share) 1.50       1.55    
Options expired (in dollars per share)         1.55    
Balance at the end of the year (in dollars per share) $ 4.36 $ 4.34 $ 3.68   $ 4.34 $ 4.36  
RSU's              
Stock-Based Compensation              
Weighted average expected period over which the expense is to be recognized           1 year 7 months 6 days  
Unamortized compensation cost for awards other than options, net of expected forfeitures $ 700,000         $ 700,000  
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 under the Amended 2010 Plan     500        
The Plans              
Available for Grant              
Balance at the beginning of the year (in shares) 1,046 1,018 1,760   1,760 1,760  
Balance at the beginning of the year (in dollars per share) $ 3.50 $ 3.52 $ 3.87   $ 3.87 $ 3.87  
Restricted stock units cancelled (in shares) 4 10 6        
Options granted (in shares) (120) (95) (1,323)        
Options cancelled (in shares) 203 128 153        
Options expired (in shares) (121) (15) (78)        
Balance at the end of the year (in shares) 1,012 1,046 1,018   1,046 1,012  
Number of Shares              
Balance at the beginning of the period (in shares) 7,069 7,142 5,994   5,994 5,994  
Options granted (in shares) 120 95 1,323        
Options cancelled (in shares) (203) (128) (153)        
Options exercised (in shares) (20) (40) (22)        
Balance at the end of the period (in shares) 6,966 7,069 7,142   7,069 6,966  
Weighted Average Exercise Prices              
Options granted (in dollars per share) $ 1.70 $ 2.04 $ 2.05        
Options cancelled (in dollars per share) 2.90 4.00 5.00        
Options exercised (in dollars per share) 1.65 1.65 1.60        
Options expired (in dollars per share) 2.26 4.35 5.79        
Balance at the end of the year (in dollars per share) $ 3.49 $ 3.50 $ 3.52   $ 3.50 $ 3.49  
The Plans | RSU's              
Available for Grant              
Restricted stock units cancelled (in shares)     6   10 4