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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock [Member] | Paid-In Capital [Member] | Accumulated Other Comprehensive (Loss) Gain [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 5 | $ 258,096 | $ (67) | $ (217,297) | $ (258) | $ 40,479
Balance, shares at Dec. 31, 2015 | 4,522,186 |  |  |  |  |
Net loss |  |  | (19,605) |  |  | (19,605)
Common stock issued, net of issuance costs | $ 9 | 13,940 |  |  |  | 13,949
Common stock issued, net of issuance costs, shares | 8,930,061 |  |  |  |  |
Common stock issued for extinguishment of convertible debt | $ 3 | 5,820 |  |  |  | 5,823
Common stock issued for extinguishment of convertible debt, shares | 2,487,562 |  |  |  |  |
Common stock issued for settlement of accounts payable |  | 850 |  |  |  | 850
Common stock issued for settlement of accounts payable, shares | 214,991 |  |  |  |  |
Common stock issued for purchase of lithium properties |  | 132 |  |  |  | 132
Common stock issued for purchase of lithium properties, shares | 100,000 |  |  |  |  |
Common stock issued for loan interest |  | 304 |  |  |  | 304
Common stock issued for loan interest, shares | 83,000 |  |  |  |  |
Common stock issued for commitment fees |  | 856 |  |  |  | 856
Common stock issued for commitment fees, shares | 315,000 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for the payment of taxes |  | 195 |  |  |  | 195
Stock compensation expense and related share issuances, net of shares withheld for the payment of taxes, shares | 14,594 |  |  |  |  |
Minimum withholding taxes on net share settlements of equity awards |  | (2) |  |  |  | (2)
Unrealized holding loss on marketable securities |  |  | 67 |  |  | 67
Balance at Dec. 31, 2016 | $ 17 | 280,191 |  | (236,902) | (258) | 43,048
Balance, shares at Dec. 31, 2016 | 16,667,394 |  |  |  |  |
Net loss |  |  |  | (19,288) |  | (19,288)
Common stock issued, net of issuance costs | $ 10 | 15,311 |  |  |  | 15,321
Common stock issued, net of issuance costs, shares | 9,926,396 |  |  |  |  |
Common stock issued for settlement of accounts payable |  | 325 |  |  |  | 325
Common stock issued for settlement of accounts payable, shares | 177,700 |  |  |  |  |
Common stock issued for purchase of lithium properties |  | 110 |  |  |  | 110
Common stock issued for purchase of lithium properties, shares | 100,000 |  |  |  |  |
Common stock issued for loan interest |  |  |  |  |  |
Common stock issued for commitment fees | $ 1 | 1,213 |  |  |  | 1,214
Common stock issued for commitment fees, shares | 880,000 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for the payment of taxes |  | 101 |  |  |  | 101
Stock compensation expense and related share issuances, net of shares withheld for the payment of taxes, shares | 38,834 |  |  |  |  |
Minimum withholding taxes on net share settlements of equity awards |  | (1) |  |  |  | (1)
Unrealized holding loss on marketable securities |  |  | 287 |  |  | 287
Balance at Dec. 31, 2017 | $ 28 | $ 297,250 | $ 287 | $ (256,190) | $ (258) | $ 41,117
Balance, shares at Dec. 31, 2017 | 27,790,324 |  |  |  |  |

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