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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 976,000 | 30,860,000 |  |
Beginning balance, amount at Dec. 31, 2016 | $ 26,223 | $ 1 | $ 31 | $ 49,625 | $ (23,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Conversion of Series B convertible preferred to common stock (in shares) |  | (976,000) | 1,951,000 |  |
Conversion of Series B convertible preferred to common stock | 0 | $ (1) | $ 2 | (1) |
Stock based compensation | $ 871 |  |  | 871 |
Shares issued on net settlement of stock options (in shares) | 19,688 |  | 47,000 |  |
Shares issued on net settlement of warrants (in shares) |  |  | 20,000 |  |
Net income (loss) | $ (5,062) |  |  |  | (5,062)
Ending balance (in shares) at Dec. 31, 2017 |  | 0 | 32,878,000 |  |
Ending balance, amount at Dec. 31, 2017 | 22,032 | $ 0 | $ 33 | 50,495 | (28,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | 67,262 |  |  |  |
Ending balance, amount at Sep. 30, 2018 | 90,597 |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  | 0 | 32,878,000 |  |
Beginning balance, amount at Dec. 31, 2017 | 22,032 | $ 0 | $ 33 | 50,495 | (28,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised for cash (in shares) |  |  | 88,000 |  |
Options exercised for cash | 202 |  |  | 202 |
Stock based compensation | $ 2,224 |  |  | 2,224 |
Shares issued on net settlement of stock options (in shares) | 17,289 |  | 721,000 |  |
Shares issued on net settlement of stock options | $ 0 |  | $ 1 | (1) |
Shares issued on net settlement of warrants (in shares) |  |  | 18,000 |  |
Net income (loss) | 62,719 |  |  |  | 62,719
Ending balance (in shares) at Dec. 31, 2018 |  | 0 | 33,705,000 |  |
Ending balance, amount at Dec. 31, 2018 | 87,177 | $ 0 | $ 34 | 52,920 | 34,223
Ending balance, amount at Mar. 31, 2019 | 82,831 |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  | 0 | 33,705,000 |  |
Beginning balance, amount at Dec. 31, 2018 | 87,177 | $ 0 | $ 34 | 52,920 | 34,223
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised for cash (in shares) |  |  | 61,000 |  |
Options exercised for cash | 207 |  |  | 207 |
Stock based compensation | 3,581 |  |  | 3,581 |
Shares issued on net settlement of stock options (in shares) |  |  | 223,000 |  |
Vested restricted stock issued (in shares) |  |  | 181,000 |  |
Net income (loss) | (19,706) |  |  |  | (19,706)
Ending balance (in shares) at Dec. 31, 2019 |  | 0 | 34,170,000 |  |
Ending balance, amount at Dec. 31, 2019 | $ 71,259 | $ 0 | $ 34 | $ 56,708 | $ 14,517

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