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Leases (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Net Operating Lease Expense

For the years ended December 31, 2023 and 2022, the net operating lease expenses were as follows (in thousands):

   
Years ended December 31,
  
   
2023
    
2022
  
Operating lease expense
  
$
3,399
    
$
595
  
Sublease income
    
(84
)
    
(84
)
Variable lease expense
    
136
      
150
  
Total lease expense
  
$
3,451
    
$
661
  
Operating Lease Right-of-use Assets and Liabilities

The tables below show the beginning balances of the operating ROU assets and lease liabilities as of January 1, 2023 and the ending balances as of December 31 2023, including the changes during the period (in thousands).

   
Operating Lease
ROU Assets
  
       
Operating lease ROU assets at January 1, 2023
  
$
1,030
  
Recognition of ROU asset for Somerville Sublease
    
34,410
  
Adjustment to ROU asset for remeasurement of Somvervile Sublease liability
    
(1,620
)
Amortization of operating lease ROU assets
    
(1,039
)
Operating lease ROU assets at December 31, 2023
  
$
32,781
  

   
Operating Lease
Liabilities
  
Operating lease liabilities at January 1, 2023
  
$
1,182
  
Recognition of lease liability for Somerville Sublease
    
34,169
  
Accretion of interest for Somerville Sublease
    
1,858
  
Adjustment to lease liablity due to remeasurement of Somerville Sublease
    
(1,620
)
Principal payments on operating lease liabilities
    
(519
)
Operating lease liabilities at December 31, 2023
    
35,070
  
Less non-current portion
    
32,854
  
Current portion at December 31, 2023
  
$
2,216
  
Maturities of Operating Lease Liabilities The maturities of the operating lease liabilities are as follows (in thousands):

   
As of
December 31,
2023
  
2024
  
$
6,972
  
2025
    
6,075
  
2026
    
6,238
  
2027
    
6,308
  
2028
    
6,406
  
Thereafter
    
33,879
  
Total payments
    
65,878
  
Less imputed interest
    
(30,808
)
Total operating lease liabilities
  
$
35,070
  
Future Lease Payments from Sublease Agreement

The following tables shows the future payments the Company expects to receive from the Subtenant over the remaining term of the sublease (in thousands):

 
  
As of
December 31,
2023
  
2024
  
$
86
  
2025
    
88
  
2026
    
75
  
Total payments
 
$
249