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Leases - Narrative (Details)
$ in Thousands
 3 Months Ended
Aug. 30, 2024
USD ($)
ft²
May 07, 2024
USD ($)
ft²
May 01, 2024
USD ($)
extension_option
Feb. 28, 2024
USD ($)
ft²
Nov. 13, 2023
operating_lease
Oct. 31, 2023
USD ($)
ft²
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
Jul. 17, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 06, 2022
ft²
Sep. 01, 2022
ft²
Jul. 31, 2019
ft²
Operating Leased Assets [Line Items]                            
Operating lease, weighted average discount rate, percent               11.60% 9.70%          
Lease liabilities               $ 14,651            
Right-of-use asset, net             $ 10,068 13,523            
65 Grove Street, Watertown, MA                            
Operating Leased Assets [Line Items]                            
Area of office space leased | ft²           5,600           7,216 7,216 25,078
Letter of credit outstanding                   $ 1,600        
Upfront rental payment           $ 1,000                
Deferred rent             800 100            
Right-of-use asset impairment expense             700              
65 Grove Street, Watertown, MA | Letter of Credit                            
Operating Leased Assets [Line Items]                            
Restricted cash                     $ 1,600      
Long-term restricted cash             $ 1,400 1,400            
704 Quince Orchard Road Leases                            
Operating Leased Assets [Line Items]                            
Number of acquired operating leases | operating_lease         2                  
Operating lease, weighted average discount rate, percent         11.50%                  
7495 new Horizon Way Lease                            
Operating Leased Assets [Line Items]                            
Area of office space leased | ft² 2,009 7,842   19,199                    
Letter of credit outstanding               $ 300            
Operating lease, weighted average discount rate, percent   14.00% 14.00%                      
Lease term     7 years 2 months 12 days                      
Number of options to extend lease | extension_option     1                      
Lease renewal term (in years)     5 years                      
Lease agreement, monthly base rent     $ 900                      
Base rent upward annual adjustment percentage after first year 3.00% 3.00% 3.00%                      
Lease agreement, first month's rent paid upon execution of lease agreement       $ 100                    
Lease liabilities $ 300 $ 1,200 $ 3,600                      
Right-of-use asset, net 300 1,200 3,700                      
Tenant improvement recognized as reduction in right-of-use asset and lease liability   100 $ 700                      
Additional annual base rent for first year $ 100 $ 300                        
7495 new Horizon Way Lease | Minimum                            
Operating Leased Assets [Line Items]                            
Operating lease, cost (as a percent)     100.00%                      
7495 new Horizon Way Lease | Maximum                            
Operating Leased Assets [Line Items]                            
Operating lease, cost (as a percent)     103.00%