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CAPITALIZED FEES PAID - Schedule of Capitalized Fees Paid (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Capitalized Fees paid |  |  |
Gross carrying value | $ 220,000 | $ 220,000 |
Accumulated amortization | (136,216) | (122,393) |
Net carrying value | $ 83,784 | 97,607 |
Weighted average remaining amortization period | 6 years 2 months 12 days |  |
Capitalized Fees paid, Future amortization |  |  |
Estimated amortization for the year 2024 | $ 13,800 |  |
Estimated amortization for the year 2025 | 13,800 |  |
Estimated amortization for the year 2026 | 13,800 |  |
Estimated amortization for the year 2027 | 13,800 |  |
Estimated amortization for the year 2028 | 13,700 |  |
Estimated amortization after 2028 | 14,800 |  |
Royalty revenue |  |  |
Capitalized Fees paid |  |  |
Amortization expense | 13,800 | 13,800 | $ 13,800
United States |  |  |
Capitalized Fees paid |  |  |
Gross carrying value | 120,000 | 120,000 |
Europe |  |  |
Capitalized Fees paid |  |  |
Gross carrying value | 60,000 | 60,000 |
Japan |  |  |
Capitalized Fees paid |  |  |
Gross carrying value | 40,000 | 40,000 |
GSK | Royalty revenue |  |  |
Capitalized Fees paid |  |  |
Amortization expense | $ 13,823 | $ 13,823 | $ 13,823

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