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Organization and Operations (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Organization and Operations [Abstract]                      
Number of subsidiaries                 3    
Net loss $ 3,823,000 $ 11,248,000 $ 7,883,000 $ 9,325,000 $ 6,906,000 $ 8,335,000 $ 5,138,000 $ 12,072,000 $ 32,279,000 $ 32,451,000 $ 27,494,000
Accumulated deficit 274,728,000       242,449,000       274,728,000 242,449,000  
Net cash used                 32,193,000 35,323,000 23,574,000
Principal payment amount per month                 $ 825,000