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Equity Plans and Share-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option plan term 10 years    
Option plan term for options granted to an optionee owning more than 10% 5 years    
Optionee owner percentage 10.00%    
Exercise price to fair market value percentage 110.00%    
Non-statutory option granted exercise price to fair market value percentage 85.00%    
Options granted (in shares) 785 45 1,295
Share-based compensation expense $ 621,505 $ 924,315 $ 1,572,607
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 311,965 443,103 768,703
Weighted average grant date fair value (in dollars per share) $ 0.49 $ 0.60 $ 1.49
Total compensation cost not yet recognized 304,000    
Recognized over a weighted average period 1 year 5 months 10 days    
Vested and expected to vest shares (in shares) 1,312,028    
Vested and expected to vest weighted average exercise price (in dollars per share) $ 1.95    
Number of shares available for grant (in shares) 1,432,967    
Restricted Stock Units and Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants (in shares) 427 658 488
Share-based compensation expense 309,540 481,212 803,904
Total compensation cost not yet recognized $ 14,000    
Recognized over a weighted average period 0 years 6 months 10 days    
Number of shares available for grant (in shares) 756,017    
Restricted stock, weighted average estimated fair value (in dollars per share) $ 0.62 $ 0.57 $ 3.19
Restricted stock expected to vest (in shares) 14,745    
Stock Option Plan 2005 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 1,000,000    
Increased number of shares authorized 3,700,000    
Restricted Stock Plan 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 750,000    
Increased number of shares authorized 2,550,000    
Grants Outside Existing Equity Plans [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 200,000    
Grants Outside Existing Equity Plans [Member] | Restricted Stock Units and Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants (in shares) 40,000