v3.25.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
ft²
Apr. 30, 2024
USD ($)
ft²
May 31, 2023
USD ($)
shares
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2025
USD ($)
renewal_term
Mar. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2021
USD ($)
Oct. 31, 2020
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Operating lease right-of-use asset               $ 2,092     $ 2,205    
Lease remaining term (in months)               4 years 1 month 6 days          
Operating lease liability, short-term               $ 536     $ 513    
Operating lease, liability, current, statement of financial position [Extensible List]               Accrued liabilities and other (including related party of $719 and $— as of March 31, 2025 and December 31, 2024, respectively)     Accrued liabilities and other (including related party of $719 and $— as of March 31, 2025 and December 31, 2024, respectively)    
Long term lease obligation               $ 1,900          
Operating lease, liability, noncurrent, statement of financial position [Extensible List]               Other liabilities          
Operating lease, weighted average incremental borrowing rate (in percent)               9.30%          
Amortization expense relating to operating lease right-of-use assets               $ 200 $ 200        
Operating lease expenses               $ 100 $ 100        
Colorado Lease                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Number of renewal terms (up to) | renewal_term               3          
Lessee, operating lease, renewal term 5 years             3 years          
Operating lease right-of-use asset $ 300                     $ 1,600  
Lease discount rate (in percent)                       6.00%  
Lease remaining term (in months)                       12 months  
Operating lease, annual base rent 100                        
Operating lease liability, short-term 300                     $ 1,600  
Massachusetts Lease                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Lessee, operating lease, renewal term   3 years                      
Operating lease right-of-use asset 500 $ 1,600                     $ 100
Lease discount rate (in percent)                         6.00%
Operating lease, annual base rent 100 500                      
Operating lease liability, short-term $ 500 $ 1,900                     $ 100
Area of property | ft² 2,788 10,427             10,956        
Lessee, operating lease, term of contract (in years)   5 years                      
Operating lease right-of-use asset derecognized   $ 1,100                      
Operating lease liability derecognized   $ 1,200                      
ImmunoGen, Inc                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Milestone payments                         48,000
Collaborative arrangement, milestone payment         $ 10,000 $ 3,000 $ 2,500            
Potential royalty payments                         $ 95,000
Enable Injections                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Milestone payments       $ 45,000                  
Potential royalty payments       150,000                  
Collaborative arrangement, rights and licenses fee       $ 15,000                  
Third Party Collaborator                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Milestone payments     $ 45,000                    
Potential royalty payments     $ 60,000                    
Shares issued in exchange for rights granted (in shares) | shares     243,902                    
Value of shares issued in exchange for rights granted                   $ 5,700      
Collaborative arrangement, value of shares to be issued for rights granted     $ 10,000