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Capital Availability (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Capital Availability [Abstract]      
Net loss $ (5,339,000) $ (21,958,000)  
Accumulated deficit (362,356,000)   $ (357,017,000)
Net cash used in operating activities (5,058,000) $ (5,030,000)  
Minimum cash on hand consider to avoid an event of default $ 5,000,000    
Percentage of warrant coverage 100.00%