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Stockholders' Equity (Details Narrative) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Aug. 07, 2018 shares | Jun. 14, 2018 USD ($) $ / shares shares | May 03, 2018 USD ($) shares | Apr. 23, 2018 shares | Apr. 23, 2018 shares | Apr. 18, 2018 USD ($) a shares | Sep. 27, 2017 USD ($) shares | Sep. 25, 2017 USD ($) 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
Proceeds from common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 415 | $ 651 | $ 8,715 | $ 16,535
Fair value of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95 | $ 325
Number of shares issued for services | shares |  |  | 172,727 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued for services, value |  |  | $ 95 |  |  |  |  |  |  |  |  |  |  |  | 95 |
Option Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | shares |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |
Fair value of shares issued |  |  |  |  |  | $ 114 |  |  |  |  |  |  |  |  |  |
Mining claims covering area | a |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |  |
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 | shares |  |  |  |  |  |  |  |  |  |  |  |  | 488,685 |  |  |
ATM Offering [Member] | January 31, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900 |
Number of common stock sold | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,573,682 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | shares |  |  |  |  |  |  |  |  |  |  |  |  | 57,205 | 20,802 | 32,018,551 | 9,926,396
Number of shares issued for services | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 172,727 |
Number of shares issued for services, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | ATM Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  | $ 4,500 |
Number of common stock sold | shares |  |  |  |  |  |  |  |  |  |  |  |  | 57,205 |  | 20,900,173 |
Available for future sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,800 |  | $ 23,900 |
Common stock registered for sale, value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 3,100 |
Aspire Capital Fund LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering |  | $ 2,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | shares | 4,825,509 | 3,717,773 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price per shares issued | $ / shares |  | $ 0.34 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock |  | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aspire Capital Fund LLC [Member] | Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering |  |  |  |  |  |  |  | $ 22,000 |  |  |  |  |  |  |  |
Number of common stock issued | shares |  | 2,725,096 |  |  |  |  | 1,428,571 | 880,000 |  |  |  |  |  |  | 2,575,096 |
Proceeds from common stock |  | $ 1,500 |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  | $ 1,300 |
Aspire Capital Fund LLC [Member] | Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued for common stock | shares |  | 4,968,518 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prefunded warrants price per share | $ / shares |  | $ 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds of warrants |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant purchase price per share | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable term |  | Aug. 07, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alabama Graphite [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued | shares |  |  |  | 232,504 | 11,625,210 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |

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