SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	1 Months Ended		3 Months Ended			12 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) unit	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Insurance coverage limit						$ 250,000
Intangibles impairment charge					$ 31,700,000	$ 27,764,000	$ 31,700,000	$ 0
Number of reporting units | unit						1
Goodwill		$ 13,064,000	$ 13,100,000	$ 13,064,000		$ 0	13,064,000
Goodwill impairment							$ 0
License agreement, royalty rate			2.00%			2.00%
Contingent consideration liability, measurement input		0.080		0.080			0.080
Business combination, contingent consideration, liability			$ 1,800,000			$ 0			$ 0
Dividend yield						0.00%
License and related revenue						$ 40,000,000	$ 26,544,000	$ 11,236,000
Discount Rate
Property, Plant and Equipment [Line Items]
Weighted-average cost of capital		9.30%		9.30%			9.30%
Roche
Property, Plant and Equipment [Line Items]
Proceeds from milestone achieved	$ 20,000,000
Performance-Based Awards
Property, Plant and Equipment [Line Items]
Award vesting period						4 years
Expected term (in years)						10 years
IPR&D intangible assets:
Property, Plant and Equipment [Line Items]
Total Intangibles		$ 14,700,000		$ 14,700,000		$ 0	$ 14,700,000
Licensing Agreements | Roche
Property, Plant and Equipment [Line Items]
Milestone payment		$ 20,000,000
Milestone payment term		30 days
Vicinium | Europe | IPR&D intangible assets:
Property, Plant and Equipment [Line Items]
Intangibles impairment charge			14,700,000
Total Intangibles		$ 14,700,000	$ 0	14,700,000		$ 0	$ 14,700,000
EBI-031 | Roche
Property, Plant and Equipment [Line Items]
License and related revenue				$ 20,000,000
Proceeds from milestone achieved	$ 20,000,000
Lab equipment
Property, Plant and Equipment [Line Items]
Estimated useful life						5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life						4 years
Computer equipment
Property, Plant and Equipment [Line Items]
Estimated useful life						3 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life						5 years