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UNAUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | ---
Balances, beginning of period at Dec. 31, 2018 | $ 456,938 | $ (435,684) | $ 21,254
Balances, beginning of period (in shares) at Dec. 31, 2018 | 100,268,161 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (46) |  | (46)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 142,380 |  |
Shares issued (exercise of stock options) | $ 66 |  | 66
Shares issued (exercise of stock options) (in shares) | 127,000 |  |
Stock-based compensation (Note 6) | $ 467 |  | 467
Net income/(loss) |  | (5,696) | (5,696)
Balances, end of period at Jun. 30, 2019 | $ 457,425 | (441,380) | 16,045
Balances, end of period (in shares) at Jun. 30, 2019 | 100,537,541 |  |
Balances, beginning of period at Dec. 31, 2018 | $ 456,938 | (435,684) | $ 21,254
Balances, beginning of period (in shares) at Dec. 31, 2018 | 100,268,161 |  |
Shares issued (exercise of stock options) (in shares) |  |  | 163,667
Balances, end of period at Dec. 31, 2019 | $ 457,716 | (445,070) | $ 12,646
Balances, end of period (in shares) at Dec. 31, 2019 | 100,698,124 |  |
Balances, beginning of period at Mar. 31, 2019 | $ 457,009 | (438,336) | 18,673
Balances, beginning of period (in shares) at Mar. 31, 2019 | 100,537,541 |  |
Stock-based compensation (Note 6) | $ 416 |  | 416
Net income/(loss) |  | (3,044) | (3,044)
Balances, end of period at Jun. 30, 2019 | $ 457,425 | (441,380) | 16,045
Balances, end of period (in shares) at Jun. 30, 2019 | 100,537,541 |  |
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 |  | 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 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 |  |

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