Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary Of Unvested Shares) (Details)

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Stock-Based Compensation (Summary Of Unvested Shares) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of options, Cancelled (379,833)    
Weighted average fair value at grant date, Vested $ 0.47 $ 0.69 $ 0.28
Nonvested Options [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of options, outstanding 3,233,499    
Number of options, Granted 4,201,316    
Number of options, Vested (1,308,050)    
Number of options, Cancelled (238,333)    
Number of options, outstanding 5,888,432 3,233,499  
Weighted average fair value at grant date, Unvested $ 0.60    
Weighted average fair value at grant date, Granted 0.47    
Weighted average fair value at grant date, Vested 0.58    
Weighted average fair value at grant date, Cancelled 0.57    
Weighted average fair value at grant date, Unvested $ 0.51 $ 0.60