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Loss Per Share (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member]      
Class of Stock [Line Items]      
Dilutive Securities Excluded From Computation Of Earnings Per Share, Shares 6,663,270 4,427,276 2,932,191
Warrant [Member]      
Class of Stock [Line Items]      
Dilutive Securities Excluded From Computation Of Earnings Per Share, Shares 3,214,033 3,550,956 4,898,266
Restricted Stock [Member]      
Class of Stock [Line Items]      
Dilutive Securities Excluded From Computation Of Earnings Per Share, Shares 202,776 280,481 78,500