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Stock-Based Compensation - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Options          
Stock-Based Compensation          
Unamortized compensation cost, net of expected forfeitures $ 1,500,000     $ 1,500,000  
Weighted average expected period over which the expense is to be recognized       1 year 8 months 12 days  
Tax benefits associated with exercise of stock options $ 0   $ 0 $ 0 $ 0
Inducement grant options          
Number of Shares          
Balance at the beginning of the period (in shares) 1,501 1,640   1,640  
Options cancelled (in shares) (366) (139)      
Balance at the end of the period (in shares) 1,135 1,501   1,135  
Weighted Average Exercise Prices          
Balance at the beginning of the year (in dollars per share) $ 4.42 $ 4.37   $ 4.37  
Options cancelled (in dollars per share) 3.83 3.87      
Balance at the end of the year (in dollars per share) $ 4.61 $ 4.42   $ 4.61  
RSU's          
Stock-Based Compensation          
Weighted average expected period over which the expense is to be recognized       10 months 24 days  
Unamortized compensation cost for awards other than options, net of expected forfeitures $ 300,000     $ 300,000  
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) 1,805 1,059   1,059  
Options cancelled (in shares) 413 232      
Balance at the end of the year (in shares) 2,220 1,805   2,220  
Number of Shares          
Balance at the beginning of the period (in shares) 6,437 6,749   6,749  
Options cancelled (in shares) (413) (232)      
Options cancelled and expired (in shares) (500) (80)      
Balance at the end of the period (in shares) 5,524 6,437   5,524  
Weighted Average Exercise Prices          
Balance at the beginning of the year (in dollars per share) $ 3.51 $ 3.51   $ 3.51  
Options cancelled (in dollars per share) 3.87 3.30      
Options cancelled and expired (in dollars per share) 4.53 4.18      
Balance at the end of the year (in dollars per share) $ 3.40 $ 3.51   $ 3.40  
The Plans | RSU's          
Available for Grant          
Restricted stock units cancelled (in shares) 2 14