Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary of Stock Options Activity) (Details)

v3.3.1.900
Stock-Based Compensation (Summary of Stock Options Activity) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options      
Outstanding at beginning of year 5,345,764    
Granted 1,365,400    
Exercised (146,625) (468,000) (60,000)
Canceled and forfeited (1,081,725)    
Expired (45,750)    
Outstanding at end of year 5,437,064 5,345,764  
Exercisable at end of year 2,512,049    
Weighted Average Exercise Price      
Outstanding at beginning of period, dollars per share $ 2.16    
Granted, dollars per share 1.67    
Exercised, dollars per share 0.61    
Canceled and Forfeited, dollars per share 2.82    
Expired, dollars per share 0.39    
Outstanding at end of period, dollars per share 1.96 $ 2.16  
Exercisable at end of period, dollars per share $ 2.14    
Weighted Average Remaining Contractual Life (years)      
Outstanding at end of year 7 years 2 months 12 days    
Exercisable at end of year 5 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding at end of year $ 301,969    
Exercisable at end of year $ 251,889