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STOCK-BASED COMPENSATION - Options activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Options Outstanding |  |  |
Outstanding at beginning of period (in shares) | 4,695,619 |  |
Options granted (in shares) | 0 |  |
Options exercised (in shares) | (32,290) | 0 |
Outstanding at end of period (in shares) | 4,663,329 |  | 4,695,619
Exercisable at end of period (in shares) | 4,371,160 |  |
Nonvested at end of period (in shares) | 292,169 |  |
Weighted-Average Exercise Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 2.01 |  |
Options exercised (in dollars per share) | 1.05 |  |
Outstanding at end of period (in dollars per share) | 2.01 |  | $ 2.01
Exercisable at end of period (in dollars per share) | 2.08 |  |
Nonvested at end of period (in dollars per share) | $ 1.05 |  |
Weighted-Average Remaining Contractual Term-in years |  |  |
Outstanding | 5 years 1 month 6 days |  | 5 years 10 months 24 days
Exercisable | 5 years 1 month 6 days |  |
Nonvested | 7 years 6 months |  |
Aggregate Intrinsic Value |  |  |
Options exercised (in dollars) | $ 200 |  |
Outstanding (in dollars) | 22,318 |  | $ 7,875
Exercisable (in dollars) | 20,638 |  |
Nonvested (in dollars) | 1,680 |  |
Grant-date fair value of stock options vested during the period | $ 36 | $ 100 |

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