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Leases (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2020
ft²
Sep. 30, 2023
USD ($)
ft²
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
ft²
Sep. 30, 2022
USD ($)
May 31, 2023
ft²
Jan. 31, 2023
ft²
Dec. 31, 2022
USD ($)
Feb. 28, 2019
ft²
Leases                  
Area leased, sublease agreement | ft²   33,019   33,019   11,564     20,433
Sub-subleased | ft² 8,115                
Additional sublease | ft²             6,261    
Amortization expense   $ 200 $ 300 $ 700 $ 800        
Operating Leases:                  
Accumulated amortization   (463)   (463)       $ (407)  
Other assets   6,917   6,917       6,973  
Current portion of lease liabilities   310   310       684  
Other liabilities   $ 1,834   $ 1,834       $ 1,570  
Financial position   Other liabilities   Other liabilities       Other liabilities  
Total operating lease liabilities   $ 2,144   $ 2,144       $ 2,254  
Operating Leases                  
Operating Leases:                  
Gross cost   5,804   5,804       5,240  
Accumulated amortization   (3,220)   (3,220)       (2,560)  
Other assets   $ 2,584   $ 2,584       $ 2,680