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Notes Receivable - Schedule of Notes Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Note Amount, current $ 1,500 $ 1,500
Plus Accrued interest, current 250
Less Unamortized Note Discount, current
Note Balance per Balance Sheet, current 1,500 1,750
Note Amount, non-current   4,332
Plus Accrued interest, non-current   1
Less Unamortized Note Discount, non-current   (1,005)
Note Balance per Balance Sheet, non-current 1,242 3,328
Note Amount, current and non-current 3,500 5,832
Plus Accrued interest, current and non-current 251
Less Unamortized Note Discount, current and non-current (758) (1,005)
Note Balance per Balance Sheet, current and non-current 2,742 5,078
Notes Receivable Laramide [Member]    
Note Amount, current 1,500 1,500
Plus Accrued interest, current 250
Less Unamortized Note Discount, current
Note Balance per Balance Sheet, current 1,500 1,750
Note Amount, non-current 2,000 3,500
Plus Accrued interest, non-current
Less Unamortized Note Discount, non-current (758) (1,005)
Note Balance per Balance Sheet, non-current $ 1,242 2,495
Notes Receivable - Alabama Graphite [Member]    
Note Amount, non-current   832
Plus Accrued interest, non-current   1
Less Unamortized Note Discount, non-current  
Note Balance per Balance Sheet, non-current   $ 833