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STOCKHOLDERS’ EQUITY - Warrants Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Number of shares |  |  |
Outstanding, beginning balance (in shares) | 3,908,276 | 3,777,549 |
Exercisable, beginning balance (in shares) |  | 3,777,549 |
Issued (in shares) | 1,666,666 | 130,727 |
Exercised (in shares) | (11,638) | 0 |
Expired (in shares) | (410,907) |  |
Outstanding, ending balance (in shares) | 5,152,397 | 3,908,276 | 3,777,549
Exercisable, ending balance (in shares) | 5,152,397 |  | 3,777,549
Weighted average exercise price |  |  |
Outstanding, beginning balance (in dollars per share) | $ 5.42 | $ 5.42 |
Exercisable, beginning balance (in dollars per share) |  | 5.42 |
Issued (in dollars per share) | 1.88 | 5.72 |
Exercised (in dollars per share) | 2.75 | 0 |
Expired (in dollars per share) | 0 |  |
Outstanding, ending balance (in dollars per share) | 4.71 | $ 5.42 | $ 5.42
Exercisable, ending balance (in dollars per share) | $ 4.71 |  | $ 5.42
Weighted average remaining life (years) |  |  |
Outstanding | 3 years 4 months 6 days | 3 years 5 months 19 days | 4 years 5 months 12 days
Exercisable | 3 years 4 months 6 days |  | 4 years 5 months 12 days
Aggregate intrinsic value (in thousands) |  |  |
Outstanding | $ 792 | $ 2,020 | $ 1,259
Exercisable | $ 792 |  | $ 1,259

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