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Leases
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Leases Leases
The Company has operating leases for real estate. The Company does not have any finance leases.

During the year ended December 31, 2021, the Company recorded $3,389 of additional right-of-use assets of which $2,359 related to two new leases that commenced during the period for its Menlo Park, California, U.S. and Sawston, U.K. locations and $1,030 which related to one lease that was extended during the period for its Oxfordshire, U.K location.

The carrying value of the right-of-use assets as of December 31, 2021 and 2020 is $2,790 and $554, respectively.
The elements of lease expense were as follows:

Year Ended December 31, 2021Year Ended December 31, 2020
Lease Cost:
    Fixed lease costs$785 $478 
    Variable lease costs164171
    Short-term lease278272
Total lease cost$1,227 $921 

The weighted average discount rate and the weighted average remaining lease term were 2.5% and 3.9 years, respectively, as of December 31, 2021. The weighted average discount rate and the weighted average remaining lease term were 3.75% and 1.1 years, respectively, as of December 31, 2020.

Future lease payments under non-cancelable leases as of December 31, 2021 are detailed as follows:

Year Ending December 31,Amount
2022$1,037 
2023509 
2024508 
2025508 
2026386 
Total lease payments2,948 
Less: imputed interest166 
Total operating lease liabilities$2,782 
Total operating lease liabilities balance sheet presentation:
Current lease liabilities$1,091 
Non-current lease liabilities1,691 
$2,782 
Amounts presented above do not include payments related to the Company's Cambridge, Massachusetts, United States office where the lease term is month to month and therefore was not capitalized on the balance sheet.