Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Exercise prices for the option and warrant shares.

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Number of replacement options and warrants.

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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 Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2018	Jun. 30, 2021	Jun. 30, 2021	May 21, 2021	Apr. 28, 2020	Apr. 18, 2019	Dec. 13, 2017	Jul. 18, 2017
Alabama Graphite
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Alabama Graphite \| CAD Currency
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Replacement options and warrants shares exchange rate	$ 0.0016
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares reserved for future issuance		1,279,774	1,279,774
Stock-based compensation expense		$ 0.2	$ 0.3
2013 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares reserved for future issuance				1,500,000	350,000	66,000		20,000
Stock option vesting period			10 years