Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2020
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation - The accompanying unaudited condensed consolidated financial statements of Medifast, Inc. and its wholly-owned subsidiaries (the “Company,” “we,” “us,” or “our”) included herein have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, certain information and notes that are normally required by GAAP have been condensed or omitted. However, in the opinion of management, all adjustments consisting of normal, recurring adjustments considered necessary for a fair presentation of the financial position and results of operations have been included and management believes the disclosures that are made are adequate to make the information presented not misleading. The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited consolidated financial statements at that date. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of results that may be expected for the fiscal year ending December 31, 2020. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the 2019 audited consolidated financial statements and notes thereto, which are included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (“2019 Form 10-K”). Presentation of Financial Statements - The unaudited condensed consolidated financial statements included herein include the accounts of the Medifast, Inc. and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Reclassification - Certain amounts reported for prior periods have been reclassified to be consistent with the current period presentation. No reclassification in the condensed consolidated financial statements had a material impact on the presentation. Use of Estimates - The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates. Accounting Pronouncements Adopted in 2020 In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40), which addresses the accounting for implementation costs associated with a hosted service. The standard provides amendments to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). On January 1, 2020, the Company adopted this ASU. The Company capitalized $1.9 million during the quarter ended March 31, 2020 as a result of adoption, principally related to the configuration and development of the Company’s new hosted enterprise resource planning tool (“ERP”). In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which institutes a new model for recognizing credit losses on financial instruments that are not measured at fair value. On January 1, 2020, the Company adopted this ASU. There was no material impact on the Company's condensed consolidated financial statements. Recently Issued Accounting Pronouncements –Pending Adoption In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, to simplify the accounting for income taxes. The standard eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences related to changes in ownership of equity method investments and foreign subsidiaries. The standard also simplifies aspects of accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill and allocating consolidated income taxes to separate financial statements of entities not subject to income tax. This ASU is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. Upon adoption, the Company must apply certain aspects of this standard retrospectively for all periods presented while other aspects are applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Management is currently evaluating the effect that the provisions of ASU 2019-12 will have on the Company’s condensed consolidated financial statements. Coronavirus Aid, Relief and Economic Security Act ("CARES Act") On March 27, 2020, the President of the United States signed into law the CARES Act. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. There was no material impact on the Company’s condensed consolidated financial statements for the three months ended March 31, 2020. Management is currently evaluating the impact of the CARES Act will have on the Company’s condensed consolidated financial statements for the future periods.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation - The accompanying unaudited condensed consolidated financial statements of Medifast, Inc. and its wholly-owned subsidiaries (the “Company,” “we,” “us,” or “our”) included herein have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) for interim reporting and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, certain information and notes that are normally required by GAAP have been condensed or omitted. However, in the opinion of management, all adjustments consisting of normal, recurring adjustments considered necessary for a fair presentation of the financial position and results of operations have been included and management believes the disclosures that are made are adequate to make the information presented not misleading. The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited consolidated financial statements at that date.

The results of operations for the three months ended March 31, 2020 are not necessarily indicative of results that may be expected for the fiscal year ending December 31, 2020. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the 2019 audited consolidated financial statements and notes thereto, which are included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (“2019 Form 10-K”).

Presentation of Financial Statements - The unaudited condensed consolidated financial statements included herein include the accounts of the Medifast, Inc. and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.

Reclassification - Certain amounts reported for prior periods have been reclassified to be consistent with the current period presentation. No reclassification in the condensed consolidated financial statements had a material impact on the presentation.

Use of Estimates - The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates.

Accounting Pronouncements Adopted in 2020

In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40), which addresses the accounting for implementation costs associated with a hosted service. The standard provides amendments to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license).

On January 1, 2020, the Company adopted this ASU. The Company capitalized $1.9 million during the quarter ended March 31, 2020 as a result of adoption, principally related to the configuration and development of the Company’s new hosted enterprise resource planning tool (“ERP”).

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which institutes a new model for recognizing credit losses on financial instruments that are not measured at fair value. On January 1, 2020, the Company adopted this ASU. There was no material impact on the Company's condensed consolidated financial statements.

Recently Issued Accounting Pronouncements –Pending Adoption

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, to simplify the accounting for income taxes. The standard eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences related to changes in ownership of equity method investments and foreign subsidiaries. The standard also simplifies aspects of accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill and allocating consolidated income taxes to separate financial statements of entities not subject to income tax. This ASU is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. Upon adoption, the Company must apply certain aspects of this standard retrospectively for all periods presented while other aspects are applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. Management is currently evaluating the effect that the provisions of ASU 2019-12 will have on the Company’s condensed consolidated financial statements.

Coronavirus Aid, Relief and Economic Security Act ("CARES Act")

On March 27, 2020, the President of the United States signed into law the CARES Act. The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. There was no material impact on the Company’s condensed consolidated financial statements for the three months ended March 31, 2020. Management is currently evaluating the impact of the CARES Act will have on the Company’s condensed consolidated financial statements for the future periods.