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Organization and Operations (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Subsidiary
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Organization and Operations [Abstract]                        
Number of subsidiaries | Subsidiary                 5      
Net loss $ 2,756,000 $ (1,520,000) $ (4,449,000) $ 21,957,000 $ 5,755,000 $ 9,385,000 $ 11,828,000 $ 10,400,000 $ 18,744,000 $ 37,368,000 $ 26,177,000  
Accumulated deficit 357,017,000       338,273,000       357,017,000 338,273,000    
Net cash used in operating activities                 20,468,000 30,330,000 34,563,000  
Cash and cash equivalents 14,338,000       $ 14,622,000       14,338,000 $ 14,622,000 $ 15,506,000 $ 25,717,000
Joint Venture purchase obligation $ 1,800,000               1,800,000      
Minimum cash on hand consider to avoid an event of default                 $ 5,000,000      
Percentage of warrant coverage                 100.00%