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Fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Schedule Of Warrant Liabilities [Abstract]  
Schedule Of Warrant Liabilities
The following table summarizes the activity for the period: 
 
Warrant Liabilities
Fair value at December 31, 2012
$
389,454

Fair value adjustment at December 31, 2013
(257,189
)
Fair value at December 31, 2013
$
132,265