Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Exercise prices for the option and warrant shares.

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Number of replacement options and warrants.

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Number of replacement options issued.

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Number of replacement options outstanding.

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Number of replacement warrants outstanding.

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Replacement options and warrants shares exchange rate.

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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2018	Nov. 30, 2015	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Apr. 18, 2019	Dec. 13, 2017	Jul. 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 7,719	$ 80,673	$ 300	$ 100
Number of replacement options outstanding					25,271
Alabama Graphite [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of replacement options outstanding			5,568		289,600
Number of replacement options and warrants	50,168
Replacement options and warrants shares exchange rate	$ 0.0016
Exercise prices for the option and warrant shares								$ 0.77809
Number of replacement warrants outstanding			11,440		571,985
Anatolia Energy Limited [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of replacement options issued		7,495
Debt instrument conversion price per share		$ 0.0001096
Number of replacement options outstanding			449
2013 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares reserved for future issuance					13,905		66,278
2013 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares reserved for future issuance			66,278		1,083,333		66,000		20,000
Stock option vesting period			10 years		10 years