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STOCK-BASED COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
STOCK-BASED COMPENSATION |  |
Stock-based compensation expense | $ 2,379 | $ 2,055
Restricted stock units |  |
STOCK-BASED COMPENSATION |  |
Stock-based compensation expense | 1,600 | 500
Unamortized stock-based compensation costs for unvested awards | $ 18,200 | $ 5,500
Summary of restricted stock units outstanding |  |
Outstanding at beginning of period ( in shares) | 6,917,422 |
Awarded (in shares) | 530,000 |
Released (in shares) | (822,682) |
Outstanding at end of period ( in shares) | 6,624,740 |
Nonvested at end of period (in shares) | 6,533,180 |
Weighted-Average Grant Date Fair Value |  |
Outstanding at beginning of period (in dollars per share) | $ 2.35 |
Awarded (in dollars per share) | 6.75 |
Released (in dollars per share) | 1.25 |
Outstanding at end of period (in dollars per share) | 3.05 |
Nonvested at end of period (in dollars per share) | $ 3.01 |
Weighted Average Remaining Recognition Period (in years) | 3 years |

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