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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock and Additional Paid-in Capital ATM offering | Common Stock and Additional Paid-in Capital | Accumulated Deficit | ATM offering | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  | $ 1,457,422 | $ (971,476) |  | $ 485,946
Balance (in shares) at Dec. 31, 2018 |  | 344,560,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Stock issued during the period |  |  |  | 1,010,545 |
Balance at Mar. 31, 2019 |  | $ 1,479,809 | (981,612) |  | 498,197
Balance (in shares) at Mar. 31, 2019 |  | 359,986,000 |  |  |
Balance at Dec. 31, 2018 |  | $ 1,457,422 | (971,476) |  | 485,946
Balance (in shares) at Dec. 31, 2018 |  | 344,560,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Stock-based compensation |  | $ 197 |  |  | 197
Exercise of stock options |  | $ 260 |  |  | $ 260
Exercise of stock options (in shares) |  | 258,000 |  |  | 257,500
Units issued in connection with registered direct offering , net of share issue costs |  | $ 22,910 |  |  | $ 22,910
Units issued in connection with registered direct offering , net of share issue costs (in shares) |  | 16,129,000 |  |  |
Stock issued during the period | $ 1,851 |  |  | $ 1,851 |
Stock issued during the period | 1,010,000 |  |  |  |
Net loss |  |  | (23,150) |  | (23,150)
Balance at Jun. 30, 2019 |  | $ 1,482,640 | (994,626) |  | 488,014
Balance (in shares) at Jun. 30, 2019 |  | 361,957,000 |  |  |
Balance at Mar. 31, 2019 |  | $ 1,479,809 | (981,612) |  | 498,197
Balance (in shares) at Mar. 31, 2019 |  | 359,986,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Stock-based compensation |  | $ 136 |  |  | 136
Exercise of stock options |  | $ 37 |  |  | 37
Exercise of stock options (in shares) |  | 36,000 |  |  |
Units issued in connection with registered direct offering , net of share issue costs |  | $ 2,658 |  |  | 2,658
Units issued in connection with registered direct offering , net of share issue costs (in shares) |  | 1,935,000 |  |  |
Net loss |  |  | (13,014) |  | (13,014)
Balance at Jun. 30, 2019 |  | $ 1,482,640 | (994,626) |  | 488,014
Balance (in shares) at Jun. 30, 2019 |  | 361,957,000 |  |  |
Balance at Dec. 31, 2019 |  | $ 1,530,702 | (1,031,223) |  | 499,479
Balance (in shares) at Dec. 31, 2019 |  | 400,339,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Stock-based compensation |  | $ 302 |  |  | 302
Exercise of stock options |  | $ 61 |  |  | $ 61
Exercise of stock options (in shares) |  | 60,000 |  |  | 60,000
Shares issued for debt refinancing |  | $ 1,875 |  |  | $ 1,875
Shares issued for debt refinancing (in shares) |  | 2,092,000 |  |  |
Net loss |  |  | (119,005) |  | (119,005)
Balance at Jun. 30, 2020 |  | $ 1,532,940 | (1,150,228) |  | 382,712
Balance (in shares) at Jun. 30, 2020 |  | 402,491,000 |  |  |
Balance at Mar. 31, 2020 |  | $ 1,530,852 | (1,130,414) |  | 400,438
Balance (in shares) at Mar. 31, 2020 |  | 400,399,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Stock-based compensation |  | $ 213 |  |  | 213
Shares issued for debt refinancing |  | $ 1,875 |  |  | 1,875
Shares issued for debt refinancing (in shares) |  | 2,092,000 |  |  |
Net loss |  |  | (19,814) |  | (19,814)
Balance at Jun. 30, 2020 |  | $ 1,532,940 | $ (1,150,228) |  | $ 382,712
Balance (in shares) at Jun. 30, 2020 |  | 402,491,000 |  |  |

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