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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Inducement grant options
Jun. 30, 2012
Inducement grant options
Mar. 31, 2012
Inducement grant options
Sep. 30, 2012
Plans
Options
Jun. 30, 2012
Plans
Options
Mar. 31, 2012
Plans
Options
Stock-Based Compensation                    
Stock-based compensation expense $ 0.9 $ 0.9 $ 3.0 $ 2.5            
Unamortized compensation cost, net of expected forfeitures $ 5.7   $ 5.7              
Weighted average period for recognition of unamortized compensation cost     2 years 8 months 26 days              
Available for Grant                    
Balance at the beginning of the period (in shares)               2,225,000 2,529,000 1,977,000
Additional shares authorized under the 2010 Plan                   500,000
Options granted (in shares)               (1,338,000) (430,000) (4,000)
Options cancelled (in shares)               356,000 361,000 111,000
Options expired (in shares)               (209,000) (235,000) (55,000)
Balance at the end of the period (in shares)               1,034,000 2,225,000 2,529,000
Number of Shares                    
Balance at the beginning of the period (in shares)         4,314,000 4,951,000 4,815,000 6,436,000 6,387,000 6,528,000
Options granted (in shares)             350,000 1,338,000 430,000 4,000
Options cancelled (in shares)         (248,000) (199,000) (103,000) (356,000) (361,000) (111,000)
Options exercised (in shares)         (597,000) (438,000) (111,000) (78,000) (20,000) (34,000)
Balance at the end of the period (in shares)         3,469,000 4,314,000 4,951,000 7,340,000 6,436,000 6,387,000
Weighted Average Exercise Prices                    
Balance at the beginning of the period (in dollars per share)         $ 3.69 $ 3.41 $ 3.29 $ 4.30 $ 4.50 $ 4.48
Options granted (in dollars per share)             $ 3.92 $ 3.23 $ 3.23 $ 3.93
Options cancelled (in dollars per share)         $ 1.55 $ 1.55 $ 1.54 $ 5.77 $ 6.70 $ 4.23
Options exercised (in dollars per share)         $ 1.55 $ 1.55 $ 1.54 $ 2.29 $ 1.98 $ 2.85
Balance at the end of the period (in dollars per share)         $ 4.21 $ 3.69 $ 3.41 $ 4.04 $ 4.30 $ 4.50