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COLLABORATION AND LICENSING AGREEMENTS - Deferred Revenue (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Current |  |
Beginning balance | $ 7,182 |
Ending balance | 10,829 |
Non-Current |  |
Beginning balance | 8,644 |
Ending balance | 9,613 |
2017 KKC Agreement |  |
Current |  |
Beginning balance | 7,182 | $ 4,211
Amounts invoiced as prepayments for product supply | 731 | 816
Decrease for revenue recognized for product supply | (1,328) | (2,333)
Reclassify amounts to be recognized in the next twelve months | 4,244 | 3,265
Ending balance | 10,829 | 5,959
Non-Current |  |
Beginning balance | 8,644 | 9,025
Amounts invoiced as prepayments for product supply | 5,213 | 3,478
Decrease for revenue recognized for product supply | 0 | 0
Reclassify amounts to be recognized in the next twelve months | (4,244) | (3,265)
Ending balance | $ 9,613 | $ 9,238

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