17. 401(k) plan

The Company has a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. The Company matches 50% of the first 6% of an employee’s deferral. The Company’s contributions are expensed in the year for which they are declared. For the year ended December 31, 2021 and 2020, the Company recorded expense of $0.6 million and $0.4 million, respectively, for 401(k) match contributions.