SIGNIFICANT AGREEMENTS AND CONTRACTS - Summary of Contract Liability Activity (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability [Roll Forward]
Opening balance, December 31, 2021	$ 13,920
Closing balance, March 31, 2022	14,260
Current portion of deferred revenue	14,260	$ 13,920
Long-term portion of deferred revenue	17,229	18,413
Total deferred revenue	31,489
Affiliated Entity \| Mundipharma Medical Company
Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability [Roll Forward]
Opening balance, December 31, 2021	32,333
Payments received in advance	0
Payments receivable	1,508
Revenue from performance obligations satisfied during reporting period	(2,352)
Closing balance, March 31, 2022	31,489
Current portion of deferred revenue	$ 31,489	$ 32,333

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Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability, Noncurrent

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Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability, Payments Received In Advance

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Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability, Revenue Recognized

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Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Liability [Roll Forward]

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Revenue From Collaborative Arrangement, Excluding Revenue From Contract With Customer, Payment Receivable

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