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Stock-Based Compensation (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Inducement grant options
Mar. 31, 2013
Inducement grant options
Jun. 30, 2013
Plans
Options
Mar. 31, 2013
Plans
Options
Jun. 30, 2013
Plans
RSU's
Stock-Based Compensation                  
Stock-based compensation expense $ 1,000,000 $ 1,000,000 $ 1,800,000 $ 2,100,000          
Unamortized compensation cost, net of expected forfeitures 5,500,000   5,500,000            
Weighted average period for recognition of unamortized compensation cost     2 years 9 months 22 days            
Tax benefits associated with the exercise of stock options $ 0 $ 0 $ 0 $ 0          
Available for Grant                  
Balance at the beginning of the period (in shares)             1,682 1,265  
Additional shares authorized under the 2010 Plan               500  
Options granted (in shares)             (1,140) (176)  
Restricted stock units granted (in shares)                 (35)
Options cancelled (in shares)             113 471  
Options expired (in shares)             (91) (378)  
Balance at the end of the period (in shares)             529 1,682  
Number of Shares                  
Balance at the beginning of the period (in shares)         3,414 3,358 6,408 6,872  
Options granted (in shares)           151 1,140 176  
Options cancelled (in shares)           (1) (113) (471)  
Options exercised (in shares)         (31) (94) (69) (169)  
Balance at the end of the period (in shares)         3,383 3,414 7,366 6,408  
Weighted Average Exercise Prices                  
Balance at the beginning of the period (in dollars per share)         $ 4.37 $ 4.29 $ 3.97 $ 4.05  
Options granted (in dollars per share)           $ 4.21 $ 4.46 $ 3.48  
Options cancelled (in dollars per share)           $ 1.50 $ 7.04 $ 5.48  
Options exercised (in dollars per share)         $ 1.54 $ 1.55 $ 3.34 $ 2.80  
Options expired (in dollars per share)             $ 7.85 $ 5.78  
Balance at the end of the period (in dollars per share)         $ 4.39 $ 4.37 $ 3.98 $ 3.97  
Number of Shares                  
Restricted stock units granted (in shares)                 35
Non-vested shares at the end of the period                 35
Weighted Average Grant-Date Fair Value                  
Restrict stock units granted (in dollars per share)                 $ 4.46
Non-vested shares at the end of the period (in dollars per share)                 $ 4.46