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Leases - 65 Grove Street Lease (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Oct. 31, 2023
USD ($)
ft²
Sep. 01, 2022
USD ($)
ft²
Jul. 31, 2019
USD ($)
ft²
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jul. 17, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 24, 2022
USD ($)
Oct. 06, 2022
ft²
Operating Leased Assets [Line Items]                  
Lessee-paid construction costs       $ 4,394 $ 2,629        
Weighted-average discount rate       11.70% 9.90%        
Right-of-use asset, net       $ 5,535 $ 10,068        
Lease liabilities       13,984          
Asset impairment charges       7,579 710        
Right-of-use asset impairment expense       7,400          
Impairment of long-lived assets       $ 200          
Impairment of long-lived assets, location       Asset impairment charges          
65 Grove Street, Watertown,MA                  
Operating Leased Assets [Line Items]                  
Area of office space leased | ft² 5,600 7,216 25,078           7,216
Lessee-paid construction costs     $ 800            
Lease term   5 years 8 months 12 days 8 years            
Weighted-average discount rate   11.30% 8.90%         11.90%  
Base rent   $ 100              
Right-of-use asset, net         700   $ 3,200 $ 100  
Lease liabilities             $ 3,200 $ 100  
Letters of credit outstanding, amount           $ 1,600      
Upfront rental payment $ 1,000                
Deferred rent       $ 800          
65 Grove Street, Watertown,MA | Letter of Credit                  
Operating Leased Assets [Line Items]                  
Restricted cash         1,600        
Restricted cash, noncurrent       $ 1,400 $ 1,400