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Employee Benefit Plan
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Employee Benefit Plan Employee Benefit Plan
In 2002, the Company established the MacroGenics 401(k) Plan (the Plan) for its employees under Section 401(k) of the IRC. Under this Plan, all employees at least 21 years of age are eligible to participate in the Plan, starting on the first day of each month. Employees may contribute up to 100% of their salary, subject to government maximums.
Employees are 100% vested in their contributions to the Plan. The Company's contribution to the Plan, as determined by the Board of Directors, is discretionary. The Company's contributions to the Plan totaled $1.4 million in each of the years ended December 31, 2020 and 2019, and $1.3 million for the year ended December 31, 2018.