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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) | $ (76) |  | (76)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 266,296 |  |
Shares issued (exercise of stock options) | $ 66 |  | 66
Shares issued (exercise of stock options) (in shares) | 127,000 |  |
Stock-based compensation (Note 6) | $ 615 |  | 615
Net income/(loss) |  | (8,194) | (8,194)
Balances, end of period at Sep. 30, 2019 | $ 457,543 | (443,878) | 13,665
Balances, end of period (in shares) at Sep. 30, 2019 | 100,661,457 |  |
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 Jun. 30, 2019 | $ 457,425 | (441,380) | 16,045
Balances, beginning of period (in shares) at Jun. 30, 2019 | 100,537,541 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (30) |  | (30)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 123,916 |  |
Stock-based compensation (Note 6) | $ 148 |  | 148
Net income/(loss) |  | (2,498) | (2,498)
Balances, end of period at Sep. 30, 2019 | $ 457,543 | (443,878) | 13,665
Balances, end of period (in shares) at Sep. 30, 2019 | 100,661,457 |  |
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) | $ 1,436 |  | 1,436
Shares issued, net of offering costs (Note 6) (in shares) | 1,541,134 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (124) |  | (124)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 395,446 |  |
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) | $ 757 |  | $ 757
Net income/(loss) |  | 2,622 | 2,622
Balances, end of period at Sep. 30, 2020 | $ 459,822 | (442,448) | 17,374
Balances, end of period (in shares) at Sep. 30, 2020 | 102,684,704 |  |
Balances, beginning of period at Jun. 30, 2020 | $ 459,055 | (446,668) | 12,387
Balances, beginning of period (in shares) at Jun. 30, 2020 | 102,096,256 |  |
Shares issued, net of offering costs (Note 6) | $ 629 |  | 629
Shares issued, net of offering costs (Note 6) (in shares) | 509,315 |  |
Shares issued (RSUs vested, net of shares withheld) (Note 6) | $ (27) |  | (27)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) | 79,133 |  |
Stock-based compensation (Note 6) | $ 165 |  | 165
Net income/(loss) |  | 4,220 | 4,220
Balances, end of period at Sep. 30, 2020 | $ 459,822 | $ (442,448) | $ 17,374
Balances, end of period (in shares) at Sep. 30, 2020 | 102,684,704 |  |

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