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Equity Plans and Share-Based Compensation Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 170,446 $ 209,662 $ 538,365 $ 761,351
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 96,911 104,939 298,455 379,607
Weighted average grant date fair value (in dollars per share)     $ 0.49 $ 0.56
Total compensation cost not yet recognized 371,000   371,000  
Recognized over a weighted average period     1 year 8 months 0 days  
Vested and expected to vest shares (in shares) 1,501,229   1,501,229  
Vested and expected to vest weighted average exercise price (in dollars per share) $ 2.05   $ 2.05  
Number of shares available for grant (in shares) 1,331,592   1,331,592  
Restricted Stock Units and Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 73,535 104,723 239,910 381,744
Total compensation cost not yet recognized $ 82,000   $ 82,000  
Recognized over a weighted average period     0 years 3 months 8 days  
Number of shares available for grant (in shares) 756,017   756,017  
Restricted stock, weighted average estimated fair value (in dollars per share)     $ 0.62 $ 0.57
Restricted stock expected to vest (in shares) 130,863   130,863