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Stock-Based Compensation (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock-Based Compensation    
Stock-based compensation expense $ 900,000 $ 1,000,000
Unamortized compensation cost, net of expected forfeitures 4,600,000  
Weighted average period for recognition of unamortized compensation cost 2 years 6 months 29 days  
Tax benefits associated with the exercise of stock options $ 0 $ 0
Inducement grant options
    
Number of Shares    
Balance at the beginning of the period (in shares) 3,358  
Options granted (in shares) 151  
Options cancelled (in shares) (1)  
Options exercised (in shares) (94)  
Balance at the end of the period (in shares) 3,414  
Weighted Average Exercise Prices    
Balance at the beginning of the period (in dollars per share) $ 4.29  
Options granted (in dollars per share) $ 4.21  
Options cancelled (in dollars per share) $ 1.50  
Options exercised (in dollars per share) $ 1.55  
Balance at the end of the period (in dollars per share) $ 4.37  
Plans | Options
    
Available for Grant    
Balance at the beginning of the period (in shares) 1,265  
Additional shares authorized under the 2010 Plan 500  
Options granted (in shares) (176)  
Options cancelled (in shares) 471  
Options expired (in shares) (378)  
Balance at the end of the period (in shares) 1,682  
Number of Shares    
Balance at the beginning of the period (in shares) 6,872  
Options granted (in shares) 176  
Options cancelled (in shares) (471)  
Options exercised (in shares) (169)  
Balance at the end of the period (in shares) 6,408  
Weighted Average Exercise Prices    
Balance at the beginning of the period (in dollars per share) $ 4.05  
Options granted (in dollars per share) $ 3.48  
Options cancelled (in dollars per share) $ 5.48  
Options exercised (in dollars per share) $ 2.80  
Options expired (in dollars per share) $ 5.78  
Balance at the end of the period (in dollars per share) $ 3.97