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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Options
Sep. 30, 2013
Options
Sep. 30, 2014
Options
Sep. 30, 2013
Options
Sep. 30, 2014
Inducement grant options
Jun. 30, 2014
Inducement grant options
Mar. 31, 2014
Inducement grant options
Sep. 30, 2014
RSU's
Sep. 30, 2014
RSU's
Minimum
Sep. 30, 2014
RSU's
Maximum
Sep. 30, 2014
Plans
Options
Jun. 30, 2014
Plans
Options
Mar. 31, 2014
Plans
Options
Jun. 30, 2014
Plans
RSU's
Mar. 31, 2014
Plans
RSU's
Stock-Based Compensation                                      
Stock-based compensation expense $ 1,100,000 $ 1,000,000 $ 3,600,000 $ 2,800,000                              
Unamortized compensation cost, net of expected forfeitures         4,100,000   4,100,000                        
Weighted average expected period over which the expense is to be recognized             2 years 1 month 17 days         2 years 5 months 27 days              
Stock-based compensation expense, recognition period                         3 years 5 years          
Unamortized compensation cost for awards other than options, net of expected forfeitures                       1,200,000              
Tax benefits associated with exercise of stock options         $ 0 $ 0 $ 0 $ 0                      
Available for Grant                                      
Balance at the beginning of the period (in shares)                             1,865,000 374,000 422,000    
Additional shares authorized under the Amended 2010 Plan                               1,500,000 500,000    
Restricted stock units granted (in shares)                               (9,000) (499,000) (9,000) (499,000)
Options granted (in shares)                             (120,000)   (49,000)    
Options cancelled (in shares)                             257,000 4,000 60,000    
Options expired (in shares)                             (257,000) (4,000) (60,000)    
Balance at the end of the period (in shares)                             1,745,000 1,865,000 374,000    
Number of Shares                                      
Balance at the beginning of the period (in shares)                 3,329,000 3,224,000 3,178,000       6,360,000 6,416,000 6,727,000    
Options granted (in shares)                 95,000 125,000 118,000       120,000   49,000    
Options cancelled (in shares)                     (40,000)       (257,000) (4,000) (60,000)    
Options exercised (in shares)                 (5,000) (20,000) (32,000)       (48,000) (52,000) (300,000)    
Balance at the end of the period (in shares)                 3,419,000 3,329,000 3,224,000       6,175,000 6,360,000 6,416,000    
Weighted Average Exercise Prices                                      
Balance at the beginning of the period (in dollars per share)                 $ 4.45 $ 4.46 $ 4.42       $ 3.91 $ 3.89 $ 3.86    
Options granted (in dollars per share)                 $ 3.11 $ 3.87 $ 5.22       $ 3.10   $ 4.69    
Options cancelled (in dollars per share)                     $ 4.47       $ 4.55 $ 5.21 $ 3.42    
Options exercised (in dollars per share)                 $ 1.55 $ 1.55 $ 3.88       $ 1.72 $ 1.61 $ 3.58    
Options expired (in dollars per share)                             $ 4.55 $ 5.21 $ 3.42    
Balance at the end of the period (in dollars per share)                 $ 4.42 $ 4.45 $ 4.46       $ 3.88 $ 3.91 $ 3.89