Nature of the Business	12 Months Ended
Dec. 31, 2019
Nature of the Business [Abstract]
Nature of the Business	1. NATURE OF THE BUSINESS Medifast, Inc. (the “Company” or “Medifast”) is a Delaware corporation, incorporated in 1989. The Company’s operations are primarily conducted through its wholly owned subsidiaries, Jason Pharmaceuticals, Inc., OPTAVIA, LLC, Jason Enterprises, Inc., Jason Properties, LLC, Medifast Franchise Systems, Inc., Medifast Nutrition, Inc., Seven Crondall Associates, LLC, Corporate Events, Inc., OPTAVIA (Hong Kong) Limited and OPTAVIA (Singapore) PTE. LTD. Medifast is the company behind one of the fastest-growing health and wellness communities called OPTAVIA^®, which offers Lifelong Transformation, One Healthy Habit at a Time^®. OPTAVIA is a highly effective lifestyle solution for people for whom diets alone have failed. The Company has one modern, United States Food and Drug Administration (the “FDA”) approved manufacturing facility located in Owings Mills, Maryland. Medifast sells a variety of weight loss, weight management and healthy living products all based on our proprietary formulas under the Medifast^®, OPTAVIA^®, Thrive by Medifast, Optimal Health by Take Shape for Life, and Flavors of Home^® brands. The Company’s product line includes more than 170 consumable options, including, but not limited to, bars, bites, pretzels, puffs, cereal crunch, drinks, hearty choices, oatmeal, pancakes, pudding, soft serve, shakes, smoothies, soft bakes, and soups. Medifast’s nutritional products are formulated with high-quality ingredients. The processing, formulation, packaging, labeling and advertising of the Company’s products are subject to regulation by one or more federal agencies, including the FDA, the Federal Trade Commission (the “FTC”), the Consumer Product Safety Commission, the United States Department of Agriculture, and the United States Environmental Protection Agency.

Nature of the Business

12 Months Ended

Dec. 31, 2019

1. NATURE OF THE BUSINESS

Medifast, Inc. (the “Company” or “Medifast”) is a Delaware corporation, incorporated in 1989. The Company’s operations are primarily conducted through its wholly owned subsidiaries, Jason Pharmaceuticals, Inc., OPTAVIA, LLC, Jason Enterprises, Inc., Jason Properties, LLC, Medifast Franchise Systems, Inc., Medifast Nutrition, Inc., Seven Crondall Associates, LLC, Corporate Events, Inc., OPTAVIA (Hong Kong) Limited and OPTAVIA (Singapore) PTE. LTD. Medifast is the company behind one of the fastest-growing health and wellness communities called OPTAVIA^®, which offers Lifelong Transformation, One Healthy Habit at a Time^®. OPTAVIA is a highly effective lifestyle solution for people for whom diets alone have failed. The Company has one modern, United States Food and Drug Administration (the “FDA”) approved manufacturing facility located in Owings Mills, Maryland.

Medifast sells a variety of weight loss, weight management and healthy living products all based on our proprietary formulas under the Medifast^®, OPTAVIA^®, Thrive by Medifast, Optimal Health by Take Shape for Life, and Flavors of Home^® brands. The Company’s product line includes more than 170 consumable options, including, but not limited to, bars, bites, pretzels, puffs, cereal crunch, drinks, hearty choices, oatmeal, pancakes, pudding, soft serve, shakes, smoothies, soft bakes, and soups. Medifast’s nutritional products are formulated with high-quality ingredients. The processing, formulation, packaging, labeling and advertising of the Company’s products are subject to regulation by one or more federal agencies, including the FDA, the Federal Trade Commission (the “FTC”), the Consumer Product Safety Commission, the United States Department of Agriculture, and the United States Environmental Protection Agency.