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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIIES - Percentage of Accounts Receivable (Details) - Accounts Receivable - Accounts receivable from collaboration agreements, cost reimbursements concentration risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Biogen MA, Inc.
Concentration Risk [Line Items]
Percentage of accounts receivable	46.00%	52.00%
Novartis Institutes for BioMedical Research, Inc.
Concentration Risk [Line Items]
Percentage of accounts receivable	32.00%	21.00%
Sanofi S.A.
Concentration Risk [Line Items]
Percentage of accounts receivable	11.00%	19.00%

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