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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Options
Jun. 30, 2013
Options
Jun. 30, 2014
Options
Jun. 30, 2013
Options
Jun. 30, 2014
RSU's
Jun. 30, 2014
RSU's
Minimum
Jun. 30, 2014
RSU's
Maximum
Jun. 30, 2014
Inducement grant options
Mar. 31, 2014
Inducement grant 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 $ 1,000,000 $ 1,000,000 $ 2,500,000 $ 1,800,000                          
Unamortized compensation cost, net of expected forfeitures         4,500,000   4,500,000                    
Weighted average expected period over which the expense is to be recognized             2 years 2 months 26 days   2 years 8 months 16 days                
Stock-based compensation expense, recognition period                   3 years 5 years            
Unamortized compensation cost for awards other than options, net of expected forfeitures                 1,300,000                
Tax benefits associated with exercise of stock options         $ 0 $ 0 $ 0 $ 0                  
Available for Grant                                  
Balance at the beginning of the period (in shares)                           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)
Options granted (in shares)                             (49,000)    
Options cancelled (in shares)                           4,000 60,000    
Options expired (in shares)                           (4,000) (60,000)    
Balance at the end of the period (in shares)                           1,865,000 374,000    
Number of Shares                                  
Balance at the beginning of the period (in shares)                       3,224,000 3,178,000 6,416,000 6,727,000    
Options granted (in shares)                       125,000 118,000   49,000    
Options cancelled (in shares)                         (40,000) (4,000) (60,000)    
Options exercised (in shares)                       (20,000) (32,000) (52,000) (300,000)    
Balance at the end of the period (in shares)                       3,329,000 3,224,000 6,360,000 6,416,000    
Weighted Average Exercise Prices                                  
Balance at the beginning of the period (in dollars per share)                       $ 4.46 $ 4.42 $ 3.89 $ 3.86    
Options granted (in dollars per share)                       $ 3.87 $ 5.22   $ 4.69    
Options cancelled (in dollars per share)                         $ 4.47 $ 5.21 $ 3.42    
Options exercised (in dollars per share)                       $ 1.55 $ 3.88 $ 1.61 $ 3.58    
Options expired (in dollars per share)                           $ 5.21 $ 3.42    
Balance at the end of the period (in dollars per share)                       $ 4.45 $ 4.46 $ 3.91 $ 3.89