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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Retained Earnings (Accumulated Deficit) | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2020 | $ 433 | $ 118,269 | $ (78,080) | $ 40,622
Balance (in shares) at Dec. 31, 2020 | 43,347,887 |  |  |
Issuance of common stock upon exercise of stock options | $ 14 | 187 |  | 201
Issuance of common stock upon exercise of stock options (in shares) | 1,398,979 |  |  |
Excess tax benefits from exercise of stock options |  | (2,655) |  | (2,655)
Issuance of common stock for services | $ 1 |  |  | 1
Issuance of common stock for services (in shares) | 12,059 |  |  |
Share-based compensation |  | 511 |  | 511
Net income |  |  | 32,259 | 32,259
Balance at Dec. 31, 2021 | $ 448 | 116,312 | (45,821) | 70,939
Balance (in shares) at Dec. 31, 2021 | 44,758,925 |  |  |
Issuance of common stock upon exercise of stock options | $ 5 | 177 |  | 182
Issuance of common stock upon exercise of stock options (in shares) | 519,749 |  |  |
Excess tax benefits from exercise of stock options |  | (969) |  | (969)
Issuance of common stock for services (in shares) | 8,945 |  |  |
Share-based compensation |  | 922 |  | 922
Net income |  |  | 103,801 | 103,801
Balance at Dec. 31, 2022 | $ 453 | 116,442 | 57,980 | 174,875
Balance (in shares) at Dec. 31, 2022 | 45,287,619 |  |  |
Issuance of common stock upon exercise of stock options | $ 2 | 37 |  | 39
Issuance of common stock upon exercise of stock options (in shares) | 214,761 |  |  |
Excess tax benefits from exercise of stock options |  | (694) |  | (694)
Share-based compensation |  | 2,306 |  | 2,306
Net income |  |  | 52,247 | 52,247
Balance at Dec. 31, 2023 | $ 455 | $ 118,091 | $ 110,227 | $ 228,773
Balance (in shares) at Dec. 31, 2023 | 45,502,380 |  |  |

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