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Retirement Plans
 12 Months Ended
Dec. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans

14.

Retirement Plans

The Company operates a defined contribution plan intended to qualify under Section 401(k) of the U.S. Internal Revenue Code. Participating U.S. employees may contribute a portion of their pre-tax compensation, as defined, subject to statutory maximums. The Company matches employee contributions up to 5% of eligible compensation, subject to a stated calendar year Internal Revenue Service maximum.

The Company operated a defined contribution pension plan for U.K. employees pursuant to which the Company made contributions on behalf of employees plus a matching percentage of elective employee contributions. This pension plan was terminated in the quarter ending September 30, 2016 following termination of employment of all U.K. employees.

The Company contributed a total of $1.0 million and $690,000 for the years ended December 31, 2021 and 2020, respectively, in connection with these retirement plans.