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Fair Value Measurements And Derivative Instruments (Narrative) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
item
$ / shares
Jun. 06, 2014
$ / shares
Feb. 29, 2012
$ / shares
Fair Value Measurements And Derivative Instruments [Line Items]      
Number of derivative positions held | item 2    
Transfers between levels | $ $ 0    
Series C Convertible Preferred Stock [Member]      
Fair Value Measurements And Derivative Instruments [Line Items]      
Debt instrument original conversion price, per share $ 1.60   $ 8.00
Warrants [Member]      
Fair Value Measurements And Derivative Instruments [Line Items]      
Common stock warrants, exercise price   $ 9.60 $ 9.60
Common stock warrants, adjusted exercise price   $ 1.92  
Percentage of adjustment to conversion ratio   120.00%  
Subscription Rights [Member]      
Fair Value Measurements And Derivative Instruments [Line Items]      
Common stock warrants, exercise price   $ 1.60