Notes Receivable - Schedule of Notes Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	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	$ 1,617	1,545	1,750
Note Amount, non-current		2,000	4,332
Plus Accrued Interest, non-current			1
Less Unamortized Note Discount, non-current		(507)	(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	(383)	(507)	(1,005)
Note Balance per Balance Sheet, current and non-current		3,038	5,078
Notes Receivable - Laramide [Member]
Note Amount, current	2,000	1,500	1,500
Plus Accrued Interest, current		45	250
Less Unamortized Note Discount, current	(383)
Note Balance per Balance Sheet, current	$ 1,617	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

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.

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