NET REVENUES FROM COLLABORATIONS - Schedule of Transaction Price Allocated (Details) - Global Strategic Collaboration - Regeneron Pharmaceuticals $ in Thousands		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	$ 558,380	$ 521,600
Research Services Obligation
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Standalone Selling Price	130,700	130,700
Transaction Price Allocated	215,680	183,100
C5 License Obligation
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Standalone Selling Price	97,600	97,600
Transaction Price Allocated	96,700	92,500
C5 Co-Co Obligation
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Standalone Selling Price	364,600	364,600
Transaction Price Allocated	$ 246,000	$ 246,000