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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | ---
Balances, beginning of period at Dec. 31, 2019 | $ 457,716 | $ (445,070) | $ 12,646
Balances, beginning of period (in shares) at Dec. 31, 2019 | 100,698,124 |  |
Shares issued, net of offering costs (Note 6) | $ 807 |  | 807
Shares issued, net of offering costs (Note 6) (in shares) | 1,031,819 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (97) |  | (97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 316,313 |  |
Shares issued (exercise of stock options) | $ 37 |  | 37
Shares issued (exercise of stock options) (in shares) | 50,000 |  |
Stock-based compensation (Note 6) | $ 592 |  | 592
Net income (loss) |  | (1,598) | (1,598)
Balances, end of period at Jun. 30, 2020 | $ 459,055 | (446,668) | 12,387
Balances, end of period (in shares) at Jun. 30, 2020 | 102,096,256 |  |
Balances, beginning of period at Dec. 31, 2019 | $ 457,716 | (445,070) | $ 12,646
Balances, beginning of period (in shares) at Dec. 31, 2019 | 100,698,124 |  |
Shares issued (exercise of stock options) (in shares) |  |  | 50,000
Balances, end of period at Dec. 31, 2020 | $ 460,501 | (444,650) | $ 15,851
Balances, end of period (in shares) at Dec. 31, 2020 | 103,171,904 |  |
Balances, beginning of period at Mar. 31, 2020 | $ 458,106 | (448,570) | 9,536
Balances, beginning of period (in shares) at Mar. 31, 2020 | 100,698,124 |  |
Shares issued, net of offering costs (Note 6) | $ 807 |  | 807
Shares issued, net of offering costs (Note 6) (in shares) | 1,031,819 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (97) |  | (97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 316,313 |  |
Shares issued (exercise of stock options) | $ 37 |  | 37
Shares issued (exercise of stock options) (in shares) | 50,000 |  |
Stock-based compensation (Note 6) | $ 202 |  | 202
Net income (loss) |  | 1,902 | 1,902
Balances, end of period at Jun. 30, 2020 | $ 459,055 | (446,668) | 12,387
Balances, end of period (in shares) at Jun. 30, 2020 | 102,096,256 |  |
Balances, beginning of period at Dec. 31, 2020 | $ 460,501 | (444,650) | 15,851
Balances, beginning of period (in shares) at Dec. 31, 2020 | 103,171,904 |  |
Shares issued, net of offering costs (Note 6) | $ 871 |  | 871
Shares issued, net of offering costs (Note 6) (in shares) | 798,270 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (396) |  | (396)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 939,663 |  |
Stock-based compensation (Note 6) | $ 584 |  | 584
Net income (loss) |  | (3,852) | (3,852)
Balances, end of period at Jun. 30, 2021 | $ 461,560 | (448,502) | 13,058
Balances, end of period (in shares) at Jun. 30, 2021 | 104,909,837 |  |
Balances, beginning of period at Mar. 31, 2021 | $ 461,162 | (447,749) | 13,413
Balances, beginning of period (in shares) at Mar. 31, 2021 | 103,998,923 |  |
Shares issued, net of offering costs (Note 6) | $ 437 |  | 437
Shares issued, net of offering costs (Note 6) (in shares) | 392,470 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (202) |  | (202)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 518,444 |  |
Stock-based compensation (Note 6) | $ 163 |  | 163
Net income (loss) |  | (753) | (753)
Balances, end of period at Jun. 30, 2021 | $ 461,560 | $ (448,502) | $ 13,058
Balances, end of period (in shares) at Jun. 30, 2021 | 104,909,837 |  |

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