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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Paid-In Capital | Accumulated Other Comprehensive Gain (Loss) | Accumulated Deficit | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 297,278 | $ 287 | $ (256,190) | $ (258) | $ 41,117
Balance, shares at Dec. 31, 2017 | 555,806 |  |  |  |  |
Net loss |  |  |  | (23,876) |  | (23,876)
Common stock and common stock purchase warrants issued, net of issuance costs | $ 1 | 11,422 |  |  |  | 11,423
Common stock and common stock purchase warrants issued, net of issuance costs(in shares) | 387,194 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 162 |  |  |  | 162
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes, shares | 419 |  |  |  |  |
Minimum withholding taxes on net share settlements of equity awards |  | (5) |  |  |  | (5)
Unrealized holding loss on marketable securities |  |  | (1,056) |  |  | (1,056)
Transfer to realized loss upon sale of available-for-sale securities |  |  | 93 |  |  | 93
Balance at Jun. 30, 2018 | $ 1 | 308,857 | (676) | (280,066) | (258) | 27,858
Balance, shares at Jun. 30, 2018 | 943,419 |  |  |  |  |
Balance at Mar. 31, 2018 |  | 298,010 | (650) | (259,609) | (258) | 37,493
Balance, shares at Mar. 31, 2018 | 576,628 |  |  |  |  |
Net loss |  |  |  | (20,457) |  | (20,457)
Common stock and common stock purchase warrants issued, net of issuance costs | $ 1 | 10,770 |  |  |  | 10,771
Common stock and common stock purchase warrants issued, net of issuance costs(in shares) | 366,392 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 82 |  |  |  | 82
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes, shares | 399 |  |  |  |  |
Minimum withholding taxes on net share settlements of equity awards |  | (5) |  | (5) |  |
Unrealized holding loss on marketable securities |  |  | (119) |  |  | (119)
Transfer to realized loss upon sale of available-for-sale securities |  |  | 93 |  |  | 93
Balance at Jun. 30, 2018 | $ 1 | 308,857 | (676) | (280,066) | (258) | 27,858
Balance, shares at Jun. 30, 2018 | 943,419 |  |  |  |  |
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 |  |  |  | (5,949) |  | (5,949)
Common stock and common stock purchase warrants issued, net of issuance costs | $ 1 | 1,153 |  |  |  | 1,154
Common stock and common stock purchase warrants issued, net of issuance costs(in shares) | 221,263 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 15 |  |  |  | 15
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 Jun. 30, 2019 | $ 2 | 314,179 | 0 | (297,823) | (258) | 16,100
Balance, shares at Jun. 30, 2019 | 1,658,211 |  |  |  |  |
Balance at Mar. 31, 2019 | $ 1 | 313,435 | 0 | (295,048) | (258) | 18,130
Balance, shares at Mar. 31, 2019 | 1,494,153 |  |  |  |  |
Net loss |  |  |  | (2,775) |  | (2,775)
Common stock and common stock purchase warrants issued, net of issuance costs | $ 1 | 738 |  |  |  | 739
Common stock and common stock purchase warrants issued, net of issuance costs(in shares) | 164,058 |  |  |  |  |
Stock compensation expense and related share issuances, net of shares withheld for payment of taxes |  | 7 |  |  |  | 7
Minimum withholding taxes on net share settlements of equity awards |  | (1) |  |  |  | (1)
Balance at Jun. 30, 2019 | $ 2 | $ 314,179 | $ 0 | $ (297,823) | $ (258) | $ 16,100
Balance, shares at Jun. 30, 2019 | 1,658,211 |  |  |  |  |

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