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Stock-based Compensation (Details 2) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation costs related to unvested stock options not yet recognized $ 1,000,000   $ 1,000,000    
Value of estimated forfeitures     $ 60,000    
Weighted-average period of amortization     2 years 3 months 18 days    
Weighted-average grant date fair value of stock options granted (in dollars per share)   $ 1.08 $ 0.48 $ 1.09  
Weighted average assumptions [Abstract]          
Expected term     1 year    
Volatility (in hundredths)     54.21%    
Risk-free interest rate (in hundredths)     1.86%    
Number of options outstanding [Roll Forward]          
Options outstanding, beginning of period (in shares)     3,198,000    
Granted (in shares) 0 200,000 20,000 252,000  
Exercised (in shares)     (119,000)    
Canceled and expired (in shares)     (62,000)    
Options outstanding, end of period (in shares) 3,037,000   3,037,000   3,198,000
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) 3,037,000   3,037,000    
Options exercisable, end of period (in shares) 2,033,000   2,033,000    
Weighted average exercise price [Roll Forward]          
Options outstanding, beginning of period (in dollars per share)     $ 3.12    
Granted (in dollars per share)     2.51    
Exercised (in dollars per share)     1.38    
Canceled and expired (in dollars per share)     3.86    
Options outstanding, end of period (in dollars per share) $ 3.17   3.17   $ 3.12
Options vested and unvested options expected to vest, net of forfeitures, end of period (in dollars per share) 3.17   3.17    
Options exercisable, end of period (in dollars per share) $ 3.50   $ 3.50    
Weighted average Remaining Contractual Life [Abstract]          
Options outstanding     5 years 4 months 24 days   6 years 11 months 12 days
Options vested and unvested options expected to vest, net of forfeitures, end of period     5 years 4 months 24 days    
Option exercisable, end of period     4 years 4 months 17 days    
Aggregate Intrinsic Value [Abstract]          
Options outstanding, beginning of period     $ 1,247,000    
Options outstanding, end of period $ 96,000   96,000   $ 1,247,000
Options vested and unvested options expected to vest, net of forfeitures, end of period 96,000   96,000    
Options exercisable, end of period $ 96,000   $ 96,000    
Closing price (in dollars per share) $ 1.92   $ 1.92    
Restricted Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of amortization     1 year 7 months 6 days    
Unrecognized compensation expense related to restricted stock awards $ 1,000,000   $ 1,000,000    
Shares [Roll Forward]          
Non-vested, beginning of period (in shares)     261,000    
Granted (in shares)     336,000    
Vested (in shares)     (118,000)    
Forfeited (in shares)     (13,000)    
Non-vested, end of period (in shares) 466,000   466,000   261,000
Weighted Average Grant Date Fair Value [Roll Forward]          
Non-vested, beginning of period (in dollars per share)     $ 2.71    
Granted (in dollars per share)     2.56    
Vested (in dollars per share)     2.65    
Forfeited (in dollars per share)     2.34    
Non-vested, end of period (in dollars per share) $ 2.63   $ 2.63   $ 2.71