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Employee Benefit Plan | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Employee Benefit Plan | Employee Benefit PlanWe provide a retirement savings option to our eligible U.S. employees through the Moderna, Inc. 401(k) Plan (the 401(k) Plan), subject to certain limitations. As allowed under Section 401(k) of the Internal Revenue Code, the 401(k) Plan allows tax deferred salary deductions for eligible employees. We match 50% up to the first 6% contributed by a participant. All matching contributions are immediately vested. Total matching contributions to the 401(k) Plan were $5.0 million, $4.2 million, $2.1 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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