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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Paid-In Capital [Member] | Accumulated Other Comprehensive Gain (Loss) [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 297,278 | $ 287 | $ (256,190) | $ (258) | $ 41,117
Balance, shares at Dec. 31, 2017 | 555,806 |  |  |  |  |
Net loss |  |  |  | (3,419) |  | (3,419)
Common stock issued, net of issuance costs |  | 651 |  |  |  | 651
Common stock issued, net of issuance costs, shares | 20,802 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 81 |  |  |  | 81
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes, shares | 20 |  |  |  |  |
Unrealized holding gain loss on marketable securities |  |  | (937) |  |  | (937)
Balance at Mar. 31, 2018 |  | 298,010 | (650) | (259,609) | (258) | 37,493
Balance, shares at Mar. 31, 2018 | 576,628 |  |  |  |  |
Balance at Dec. 31, 2018 | $ 1 | 313,012 | (90) | (291,874) | (258) | 20,791
Balance, shares at Dec. 31, 2018 | 1,436,555 |  |  |  |  |
Net loss |  |  |  | (3,174) |  | (3,174)
Common stock issued, net of issuance costs |  | 416 |  |  |  | 416
Common stock issued, net of issuance costs, shares | 57,205 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 8 |  |  |  | 8
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes, shares | 393 |  |  |  |  |
Minimum withholding taxes on net share settlements of equity awards |  | (1) |  |  |  | (1)
Transfer to realized loss upon sale of available-for-sale securities |  |  | $ 90 |  |  | 90
Balance at Mar. 31, 2019 | $ 1 | $ 313,435 |  | $ (295,048) | $ (258) | $ 18,130
Balance, shares at Mar. 31, 2019 | 1,494,153 |  |  |  |  |

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