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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2016 |  | 976 | 30,860 |  |
Beginning balance, amount at Dec. 31, 2016 | $ 26,223 | $ 1 | $ 31 | $ 49,625 | $ (23,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised (in shares) |  |  | 21 |  |
Options exercised | 275 |  |  | 275 |
Conversion of Series B convertible preferred to common stock (in shares) |  | (976) | 1,951 |  |
Conversion of Series B convertible preferred to common stock | 0 | $ (1) | $ 2 | (1) |
Stock based compensation | 532 |  |  | 532 |
Stock issued to acquire options and warrants | (275) |  |  | (275) |
Net income (loss) | (4,238) |  |  |  | (4,238)
Ending balance, amount at Sep. 30, 2017 | 22,517 | $ 0 | $ 33 | 50,156 | (27,672)
Ending balance (in shares) at Sep. 30, 2017 |  | 0 | 32,832 |  |
Beginning balance (in shares) at Dec. 31, 2017 |  | 0 | 32,878 |  |
Beginning balance, amount at Dec. 31, 2017 | 22,032 | $ 0 | $ 33 | 50,495 | (28,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Options exercised (in shares) |  |  | 1,278 |  |
Options exercised | 3,103 |  |  | 3,103 |
Warrant exercised (in shares) |  |  | 40 |  |
Warrants exercised | 95 |  |  | 95 |
Stock based compensation | 1,238 |  |  | 1,238 |
Stock issued to acquire options and warrants (in shares) |  |  | (576) |  |
Stock issued to acquire options and warrants | (3,133) |  |  | (3,133) |
Net income (loss) | 67,262 |  |  |  | 67,262
Ending balance, amount at Sep. 30, 2018 | $ 90,597 | $ 0 | $ 33 | $ 51,798 | $ 38,766
Ending balance (in shares) at Sep. 30, 2018 |  | 0 | 33,620 |  |

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