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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Inducement grant options
Mar. 31, 2012
Inducement grant options
Jun. 30, 2012
Plans
Options
Mar. 31, 2012
Plans
Options
Jun. 30, 2012
Plans
Restricted stock awards and restricted stock unit
Mar. 31, 2012
Plans
Restricted stock awards and restricted stock unit
Stock-Based Compensation                    
Stock-based compensation expense $ 1.0 $ 0.8 $ 2.1 $ 1.6            
Unamortized compensation cost, net of expected forfeitures $ 5.0   $ 5.0              
Weighted average period for recognition of unamortized compensation cost     2 years 5 months 19 days              
Available for Grant                    
Balance at the beginning of the period (in shares)             2,529,000 1,977,000    
Additional shares authorized under the 2010 Plan               500,000    
Options granted (in shares)             (430,000) (4,000)    
Options cancelled (in shares)             361,000 111,000    
Options expired (in shares)             (235,000) (55,000)    
Balance at the end of the period (in shares)             2,225,000 2,529,000    
Number of Shares                    
Balance at the beginning of the period (in shares)         4,951,000 4,815,000 6,387,000 6,528,000    
Options granted (in shares)           350,000 430,000 4,000    
Options cancelled (in shares)         (199,000) (103,000) (361,000) (111,000)    
Options exercised (in shares)         (438,000) (111,000) (20,000) (34,000)    
Balance at the end of the period (in shares)         4,314,000 4,951,000 6,436,000 6,387,000    
Weighted Average Exercise Prices                    
Balance at the beginning of the period (in dollars per share)         $ 3.41 $ 3.29 $ 4.50 $ 4.48    
Options granted (in dollars per share)           $ 3.92 $ 3.23 $ 3.93    
Options cancelled (in dollars per share)         $ 1.55 $ 1.54 $ 6.70 $ 4.23    
Options exercised (in dollars per share)         $ 1.55 $ 1.54 $ 1.98 $ 2.85    
Balance at the end of the period (in dollars per share)         $ 3.69 $ 3.41 $ 4.30 $ 4.50    
Number of Shares                    
Non-vested shares at the beginning of the period                 15,000 15,000
Vested (in shares)                 (11,000)  
Cancelled (in shares)                 (4,000)  
Non-vested shares at the end of the period                   15,000
Weighted Average Grant-Date Fair Value                    
Non-vested shares at the beginning of the period (in dollars per share)                 $ 1.60 $ 1.60
Vested (in dollars per share)                 $ 1.62  
Cancelled (in dollars per share)                 $ 1.55  
Non-vested shares at the end of the period (in dollars per share)                   $ 1.60