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Summary Of Significant Accounting Policies (Anti-Dilutive Shares Excluded From Computation Of Diluted Net Loss Per Share) (Details) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Stock excluded from the computation of diluted net loss per share 26,656 22,542
Warrants to purchase common stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Stock excluded from the computation of diluted net loss per share   1,682