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LEASES - Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
ft²
extension_option
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Lessee, Lease, Description [Line Items]        
Operating lease, remaining lease term (in years)   8 months 12 days    
Operating lease, cost   $ 5,000 $ 5,000 $ 5,700
Operating lease, payments   5,800 5,700 5,900
Loss on termination of lease   $ 0 0 524
Minimum        
Lessee, Lease, Description [Line Items]        
Operating lease, incremental borrowing rates based on remaining lease term   6.65%    
Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease, incremental borrowing rates based on remaining lease term   6.94%    
Cambridge        
Lessee, Lease, Description [Line Items]        
Area of property leased (in square feet) | ft²   65,167    
Cambridge | Letter of Credit        
Lessee, Lease, Description [Line Items]        
Total security deposit in connection with lease   $ 1,700 1,700  
Cambridge | Office And Storage Space        
Lessee, Lease, Description [Line Items]        
Leased area subject to expiration | ft²   59,216    
Operating lease extensions (in extension options) | extension_option   1    
Lease extension period   5 years    
Cambridge | Laboratory Space        
Lessee, Lease, Description [Line Items]        
Leased area subject to expiration | ft²   5,951    
Operating lease extensions (in extension options) | extension_option   1    
Lease extension period   2 years    
Boston | Office Space        
Lessee, Lease, Description [Line Items]        
Area of property leased (in square feet) | ft²   27,924    
Payments to transfer rights and obligations of operating lease $ 1,300      
Boston | Office Space | Keryx Biopharmaceuticals, Inc.        
Lessee, Lease, Description [Line Items]        
Sublease rent payments received   $ 0 $ 0 $ 300