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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 |  |  |  |

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