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Equity Plans and Share-Based Compensation Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 201,346 $ 289,318 $ 551,688 $ 1,101,292
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 84,389 92,169 274,668 629,962
Weighted average grant date fair value (in dollars per share)     $ 0.56 $ 2.55
Total compensation cost not yet recognized 596,000   596,000  
Recognized over a weighted average period     2 years 8 months 12 days  
Vested and expected to vest shares (in shares) 1,086,220   1,086,220  
Vested and expected to vest weighted average exercise price (in dollars per share) $ 2.77   $ 2.77  
Number of shares available for grant (in shares) 1,771,300   1,771,300  
Restricted Stock Units and Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 116,957 197,149 277,020 471,330
Total compensation cost not yet recognized $ 233,000   $ 233,000  
Recognized over a weighted average period     7 months 6 days  
Number of shares available for grant (in shares) 1,197,051   1,197,051  
Restricted stock, weighted average estimated fair value (in dollars per share)     $ 0.56 $ 3.19
Restricted stock expected to vest (in shares) 289,097   289,097