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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Jun. 28, 2013
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]            
Total stock-based compensation $ 334,000 $ 300,000 $ 1,004,000 $ 873,000    
Tax effect on stock-based compensation 0 0 0 0    
Net effect on net income (loss) 334,000 300,000 1,004,000 873,000    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 1.21 $ 0        
Stock Options [Member]
            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation costs related to unvested stock options not yet recognized 1,500,000   1,500,000      
Value of estimated forfeitures     30,000      
Weighted-average period of amortization     2 years 4 months 24 days      
Weighted-average grant date fair value of stock options granted (in dollars per share)     $ 1.21 $ 2.84    
Weighted average assumptions [Abstract]            
Expected term (in years) 4 years   4 years      
Volatility (in hundredths) 61.86%   61.86%      
Expected dividend (in hundredths) 0.00%   0.00%      
Risk-free interest rate (in hundredths) 1.00%   1.00%      
Number of options outstanding [Roll Forward]            
Options outstanding, beginning of period (in shares)     2,727,000      
Granted (in shares)   0 60,000      
Exercised (in shares)     (200,000)      
Canceled and expired (in shares)     (48,000)      
Options outstanding, end of period (in shares) 2,539,000   2,539,000   2,727,000  
Options vested and expected to vest as of September 30, 2013 2,522,000   2,522,000      
Options exercisable as of September 30, 2013 1,682,000   1,682,000      
Weighted average exercise price [Roll Forward]            
Options outstanding, beginning of period (in dollars per share)     $ 3.28      
Granted (in dollars per share)   $ 0 $ 2.55      
Exercised (in dollars per share)     $ 1.40      
Canceled and expired (in dollars per share)     $ 4.42      
Options outstanding, end of period (in dollars per share) $ 3.39   $ 3.39   $ 3.28  
Options vested and expected to vest as of September 30, 2013 $ 3.39   $ 3.39      
Options exercisable as of September 30, 2013 $ 3.22   $ 3.22      
Weighted average Remaining Contractual Life [Abstract]            
Options outstanding, beginning of period     6 years 5 months 8 days   6 years 8 months 16 days  
Options outstanding, end of period     6 years 5 months 8 days   6 years 8 months 16 days  
Options vested and expected to vest, end of period     6 years 5 months 1 day      
Option exercisable, end of period     5 years 3 months 18 days      
Aggregate Intrinsic Value [Abstract]            
Options outstanding, beginning of period     1,353,000      
Options outstanding, end of period 610,000   610,000   1,353,000  
Options vested and expected to vest, aggregate intrinsic value 610,000   610,000      
Options exercisable, end of period 607,000   607,000      
Closing price (in dollars per share)           $ 2.34
Restricted Stock [Member]
            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average period of amortization     2 years 4 months 24 days      
Shares [Roll Forward]            
Non-vested, beginning of period (in shares)     238,723      
Granted (in shares)     43,636      
Vested (in shares)     (47,767)      
Non-vested, end of period (in shares) 234,592   234,592      
Weighted Average Grant Date Fair Value [Roll Forward]            
Non-vested, beginning of period (in dollars per share)     $ 4.27      
Granted (in dollars per share)     $ 2.75      
Vested (in dollars per share)     $ 5.13      
Non-vested, end of period (in dollars per share) $ 3.82   $ 3.82      
Unrecognized compensation expense related to restricted stock awards 687,000   687,000      
Cost of revenue [Member]
            
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]            
Total stock-based compensation 6,000 19,000 17,000 56,000    
Selling, general and administrative [Member]
            
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]            
Total stock-based compensation 285,000 245,000 860,000 721,000    
Research and development [Member]
            
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]            
Total stock-based compensation $ 43,000 $ 36,000 $ 127,000 $ 96,000