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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Revenues Recognized under Agreement (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 57,763	$ 21,958	$ 92,392	$ 47,577
Biogen MA, Inc.
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	9,621	0	17,799	0
Biogen MA, Inc. | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	7,306	0	14,050	0
Biogen MA, Inc. | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	2,315	0	3,749	0
Kite Pharma Inc
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	7,294	8,861	21,935	26,233
Kite Pharma Inc | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	6,296	6,296	18,750	18,682
Kite Pharma Inc | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	998	2,565	3,185	7,551
Pfizer SB-525
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	30,084	3,440	33,696	5,035
Pfizer SB-525 | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	221	3,440	2,737	5,035
Pfizer SB-525 | Milestone Achievement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	29,863	0	30,959	0
Pfizer
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	9,200	468	12,985	1,538
Pfizer | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	4,200	468	7,985	1,538
Pfizer | Milestone Achievement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	5,000	0	5,000	0
Sanofi
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	1,498	2,754	3,789	7,763
Sanofi | Collaboration Agreements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	321	940	(28)	2,594
Sanofi | Research services
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	961	1,814	3,836	5,169
Sanofi | Milestone Achievement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Revenues	$ 216	$ 0	$ (19)	$ 0

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