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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2024
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(in thousands) |  | 2024 |  | 2023
Research and development | ​ | $ | 992 | ​ | $ | 862
General and administrative | ​ |  | 1,387 | ​ |  | 1,193
Total stock-based compensation expense | ​ | $ | 2,379 | ​ | $ | 2,055
Schedule of options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted-Average |  | ​ | ​
​ |  | ​ |  | Weighted- |  | Remaining |  | Aggregate
​ | ​ | Options |  | Average |  | Contractual |  | Intrinsic
(in thousands, except for share data) | ​ | Outstanding | ​ | Exercise Price |  | Term (in years) | ​ | Value
Outstanding at December 31, 2023 |  | 4,695,619 | ​ | $ | 2.01 | ​ | 5.9 | ​ | $ | 7,875
Options granted |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Options exercised |  | (32,290) | ​ | ​ | 1.05 | ​ | ​ | ​ | ​ | ​
Forfeited |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
Outstanding at March 31, 2024 |  | 4,663,329 | ​ | $ | 2.01 | ​ | 5.1 | ​ | $ | 22,318
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at March 31, 2024 |  | 4,371,160 | ​ | $ | 2.08 | ​ | 5.1 | ​ | $ | 20,638
Nonvested at March 31, 2024 |  | 292,169 | ​ | $ | 1.05 | ​ | 7.5 | ​ | $ | 1,680
Schedule of restricted stock units outstanding | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ |  | Grant Date
(in thousands, except for share data) | ​ | Shares |  | Fair Value
Outstanding at December 31, 2023 |  | 6,917,422 | ​ | $ | 2.35
Awarded |  | 530,000 | ​ | ​ | 6.75
Released |  | (822,682) | ​ | ​ | 1.25
Forfeited |  | — | ​ | ​ | —
Outstanding at March 31, 2024 |  | 6,624,740 | ​ | $ | 3.05
Nonvested at March 31, 2024 |  | 6,533,180 | ​ | $ | 3.01
​ | ​ | ​ | ​ | ​ | ​
Weighted Average Remaining Recognition Period (in years) | ​ | 3.0 | ​ | ​ | ​

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