Notes Receivable - Schedule of Notes Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Note Amount, current	$ 1,500	$ 1,500
Plus Accrued Interest, current	45	250
Less Unamortized Note Discount, current
Note Balance per Balance Sheet, current	1,545	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	1,493	3,328
Note Amount, current and non-current	3,500	5,832
Plus Accrued interest, current and non-current	45	251
Less Unamortized Note Discount, current and non-current	(507)	(1,005)
Note Balance per Balance Sheet, current and non-current	3,038	5,078
Notes Receivable - Laramide [Member]
Note Amount, current	1,500	1,500
Plus Accrued Interest, current	45	250
Less Unamortized Note Discount, current
Note Balance per Balance Sheet, current	1,545	1,750
Note Amount, non-current	2,000	3,500
Plus Accrued Interest, non-current
Less Unamortized Note Discount, non-current	(507)	(1,005)
Note Balance per Balance Sheet, non-current	$ 1,493	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

Notes, loans and financing receivable, gross, current and noncurrent.

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- Definition

Notes, loans and financing receivable, net, current and noncurrent.

+ References

No definition available.

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Unamortized debt discount, current and noncurrent.

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Unamortized debt discount, current.

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Unamortized debt discount, noncurrent.

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- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

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Carrying amount as of the balance sheet date of noncurrent interest earned but not received. Also called accrued interest or accrued interest receivable.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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