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Retirement Plan | 12 Months Ended
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Dec. 31, 2021
Retirement Plan |
Retirement Plan | 9. Retirement Plan ​ In 2006, the Company established a 401(k) plan to cover eligible employees, which permitted deferral of up to $17,000 per year (indexed for inflation) into the 401(k) plan, subject to certain limitations imposed by the Internal Revenue Code. An employee’s elective deferrals are immediately vested upon contribution to the 401(k) plan. The Company matches employee contributions to the 401(k) plan dollar for dollar up to 3% of each employee’s annual compensation up to $200,000. In addition, we may elect to make an annual discretionary profit-sharing contribution. The Company’s total contribution under the 401(k) plan amounted to $0.1 million, $0.1 million and $0.2 million for the years ended December 31, 2021, 2020 and 2019, respectively.

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