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Organization and Operations (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Subsidiary
Dec. 31, 2012
Dec. 31, 2011
Organization and Operations [Abstract]                      
Equity method ownership interest in joint venture (in hundredths) 50.00%               50.00%    
Number of subsidiaries                 4    
Net loss $ 10,041,000 $ 5,258,000 $ 3,211,000 $ 7,667,000 $ 3,823,000 $ 11,248,000 $ 7,883,000 $ 9,325,000 $ 26,177,000 $ 32,279,000 $ 32,451,000
Accumulated deficit 300,905,000       274,728,000       300,905,000 274,728,000  
Net cash used                 34,563,000 32,193,000 35,323,000
Periodic payments beginning August 2014                 $ 868,000