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v3.19.1

COMMON STOCK (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2019 shares | Apr. 23, 2018 shares | Apr. 23, 2018 shares | May 09, 2017 USD ($) | Apr. 14, 2017 USD ($) | Apr. 14, 2017 USD ($) | Mar. 09, 2017 USD ($) | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Reverse stock split of its common stock | 0.02 |  |  |  |  |  |  |  |  |  |
Common stock outstanding before the effect of reverse stock spilt conversion | 74,700,000 |  |  |  |  |  |  | 74,700,000 |  |  |
Common stock outstanding after the effect of reverse stock spilt conversion | 1,500,000 |  |  |  |  |  |  | 1,494,153 |  | 1,436,394 | 27,782,299
Reverse stock split of its fractional shares | 0 |  |  |  |  |  |  |  |  |  |
Proceeds from common stock | $ |  |  |  |  |  |  |  | $ 415 | $ 651 | $ 8,715 | $ 16,535
ATM Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering | $ |  |  |  | $ 8,000 | $ 30,000 | $ 30,000 | $ 8,000 |  |  |  |
Proceeds from common stock | $ |  |  |  |  |  |  |  | $ 6,100 |  |  |
Sales commission percentage |  |  |  |  | 2.50% | 2.50% |  |  |  |  |
Number of common stock sold |  |  |  |  |  |  |  | 488,685 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Reverse stock split of its common stock | 0.02 |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  | 57,205 | 20,802 | 32,018,551 | 9,926,396
Common Stock [Member] | ATM Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock | $ |  |  |  |  |  |  |  | $ 400 |  | $ 4,500 |
Number of common stock sold |  |  |  |  |  |  |  | 57,205 |  | 20,900,173 |
Available for future sales | $ |  |  |  |  |  |  |  | $ 23,800 |  | $ 23,900 |
Common stock registered for sale, value | $ |  |  |  |  |  |  |  | $ 0 |  | $ 3,100 |
Alabama Graphite [Member] |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  | 11,625,210 | 232,504 |  |  |  |  |  |  |  |
Ownership percentage |  | 100.00% | 100.00% |  |  |  |  |  |  |  |

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