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LEASES - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
ft²
Dec. 31, 2024
USD ($)
Jul. 30, 2024
ft²
Jul. 01, 2024
USD ($)
Sep. 07, 2021
ft²
Lessee, Lease, Description [Line Items]          
Lessee, area of sublease | ft²     20,000    
Waltham lease for additional period 5 years        
Operating lease right-of-use assets $ 16,841 $ 19,251      
Total operating lease liabilities 16,883        
Lessee, operating lease, term of contract       5 years 3 months  
Accent Therapeutics, Inc          
Lessee, Lease, Description [Line Items]          
Letters of credit outstanding, amount 200        
Phase A Premises          
Lessee, Lease, Description [Line Items]          
Lessee, area of sublease | ft²         35,662
Waltham Lease          
Lessee, Lease, Description [Line Items]          
Lessee, operating lease, monthly base rent $ 200        
Operating lease, period for improvement 8 years 4 months        
Percentage of annual increase in operating lease 3.00%        
Letters of credit outstanding, amount $ 1,200        
Operating lease right-of-use assets $ 5,700        
Total operating lease liabilities       $ 5,700  
Lessee, operating lease, monthly base rent per square foot | ft² 71.00        
Lessee, operating lease, area of rental space | ft² 17,500