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Equity Plans and Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 232,411 $ 208,072 $ 689,911 $ 633,396
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 151,998 99,802 $ 438,995 $ 315,342
Weighted average grant date fair value (in dollars per share)     $ 0.72 $ 5.00
Total compensation cost not yet recognized $ 549,000   $ 549,000  
Recognized over a weighted average period     1 year 10 months 24 days  
Vested and expected to vest shares (in shares) 1,136,896   1,136,896  
Vested and expected to vest weighted average exercise price (in dollars per share) $ 3.38   $ 3.38  
Number of shares available for grant (in shares) 3,722,267   3,722,267  
Restricted Stock Units and Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 80,413 $ 108,270 $ 250,916 $ 318,054
Total compensation cost not yet recognized $ 85,000   $ 85,000  
Recognized over a weighted average period     6 months 14 days  
Number of shares available for grant (in shares) 1,964,893   1,964,893  
Restricted stock, weighted average estimated fair value (in dollars per share)     $ 1.11 $ 7.10
Restricted stock expected to vest (in shares) 99,258   99,258