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Capital Availability (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Capital Availability [Abstract]          
Net loss $ (9,385,000) $ (5,258,000) $ (31,612,000) $ (16,137,000)  
Accumulated deficit (332,517,000)   (332,517,000)   (300,905,000)
Net cash used     25,374,000 25,064,000  
Proceeds from sale of Series A 3.6% convertible preferred stock and warrants to purchase common stock 12,500,000        
Periodic payments beginning August 2014     $ 1,000,000