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Capital Availability (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Capital Availability [Abstract]            
Net loss $ 11,828,000 $ 3,211,000 $ 22,228,000 $ 10,877,000    
Accumulated deficit 323,133,000   323,133,000   300,905,000  
Net cash used     18,137,000 17,014,000    
Cash and cash equivalents 12,760,000 13,621,000 12,760,000 13,621,000 15,506,000 25,717,000
Periodic payments beginning August 2014     868,000      
Loan amount in event of default due and payable $ 28,670,000   $ 28,670,000