| (in thousands) | March 31, 2024 | December 31, 2023 | |||||||||||||||||||||||||||||||
| Accrued R&D costs | $ | 20,709 | $ | 24,902 | Accrued payroll and benefits | 6,029 | 12,693 | GTN sales adjustments | 8,804 | 1,543 | Operating lease liabilities, short-term | 1,432 | 1,467 | Other | 11,696 | 11,496 | $ | 48,670 | $ | 52,101 | |||||||||||||
| (in thousands) | December 31, 2023 | December 31, 2022 | |||||||||||||||||||||
| Accrued R&D costs | $ | 24,902 | $ | 35,627 | Accrued payroll and benefits | 12,693 | 16,306 | Other | 13,039 | 16,558 | $ | 50,634 | $ | 68,491 | |||||||||
