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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 |  |  |  |  |

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