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Commitments and Contingencies - Consultant Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Related Party Transaction [Line Items]        
Consultant expense $ 3,424 $ 3,560 $ 11,545 $ 7,487
Clean Coal Solutions (CCS)        
Related Party Transaction [Line Items]        
Consultant expense $ (16) $ 226 $ 263 $ 783