Summary of Significant Accounting Policies | Note 2. Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation These consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The consolidated financial statements include the results of Teladoc Health, two professional associations and fourteen professional corporations and a service corporation (collectively, the “Association”). Teladoc Health Medical Group, P.A., formerly Teladoc Physicians, P.A. is party to several Services Agreements by and among it and the professional corporations pursuant to which each professional corporation provides services to Teladoc Health Medical Group, P.A. Each professional corporation is established pursuant to the requirements of its respective domestic jurisdiction governing the corporate practice of medicine. The Company holds a variable interest in the Association which contracts with physicians and other health professionals in order to provide services to Teladoc Health. The Association is considered a variable interest entity (“VIE”) since it does not have sufficient equity to finance its activities without additional subordinated financial support. An enterprise having a controlling financial interest in a VIE, must consolidate the VIE if it has both power and benefits—that is, it has (1) the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance (power) and (2) the obligation to absorb losses of the VIE that potentially could be significant to the VIE or the right to receive benefits from the VIE that potentially could be significant to the VIE (benefits). The Company has the power and rights to control all activities of the Association and funds and absorbs all losses of the VIE. Total revenue and net loss for the VIE were $83.6 million and $(3.2) million, $58.1 million and $(2.5) million and $33.2 million and $(7.0) million for the years ended December 31, 2019, 2018 and 2017, respectively. The VIE’s total assets all of which were current were $13.6 million and $9.8 million at December 31, 2019 and 2018, respectively. Total liabilities all of which were current for the VIE were $51.3 million and $44.3 million at December 31, 2019 and 2018, respectively. The VIE total stockholders’ deficit was $37.7 million and $34.5 million at December 31, 2019 and 2018, respectively. All intercompany transactions and balances have been eliminated. Business Combinations The Company accounts for its business combinations using the acquisition method of accounting. The cost of an acquisition is measured as the aggregate of the acquisition date fair values of the assets transferred and liabilities assumed by the Company to the sellers and equity instruments issued. Transaction costs directly attributable to the acquisition are expensed as incurred. Identifiable assets and liabilities acquired or assumed are measured separately at their fair values as of the acquisition date. The excess of (i) the total costs of acquisition over (ii) the fair value of the identifiable net assets of the acquiree is recorded as goodwill. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The Company bases its estimates on historical experience, current business factors, and various other assumptions that the Company believes are necessary to consider to form a basis for making judgments about the carrying values of assets and liabilities, the recorded amounts of revenue and expenses, and the disclosure of contingent assets and liabilities. The Company is subject to uncertainties such as the impact of future events, economic and political factors, and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s consolidated financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment evolves. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations; if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowance for doubtful accounts, the carrying value of long-lived assets (including goodwill and intangible assets), the carrying value, capitalization and amortization of software development costs, purchase accounting, client performance guarantees, the calculation of a contingent liability in connection with an earn-out, the provision for income taxes and related deferred tax accounts, certain accrued liabilities, revenue recognition, contingencies, litigation and related legal accruals and the value attributed to employee stock options and other stock-based awards. Segment Information The Company’s chief operating decision maker, its Chief Executive Officer (“CEO”), reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating its financial performance. Accordingly, the Company has determined that it operates in a single reportable segment—health services. Revenue earned by foreign operations for Clients outside of the United States were $108.0 million, $75.2 million and $18.8 million for the year ended December 31, 2019, 2018 and 2017, respectively. Long-lived assets of foreign operations totaled $2.2 million, $1.5 million and $0.2 million as of December 31, 2019, 2018 and 2017, respectively. These foreign operations were acquired in connection with the MedecinDirect, Advance Medical and Best Doctors’ acquisitions in April 2019, May 2018 and July 2017, respectively. Revenue Recognition The Company generates virtual healthcare service revenue from contracts with Clients who purchase access to the Company’s professional provider network or medical experts for their employees, dependents and other beneficiaries. The Company’s client contracts include a per-member-per-month subscription access fee as well as certain contracts that generate additional revenue on a per-telehealth visit basis for general medical and other specialty visits and expert medical service on a per case basis. The Company also has certain contracts that generate revenue based solely on a per telehealth visit basis for general medical and other specialty visits. For the Company’s direct-to-consumer behavioral health product, Members purchase access to the Company’s professional provider network for a subscription access fee. Accordingly, the Company generates subscription access revenue from subscription access fees and visit fee revenue for general medical, expert medical service and other specialty visit. Revenues are recognized when the Company satisfies its performance obligation to stand ready to provide telehealth services which occurs when the Company’s Clients and Members have access to and obtain control of the telehealth service. Revenue is recognized in an amount that reflects the consideration that is expected in exchange for the service and includes a variable transaction price as the number of Members may vary from period to period. Based on historical experience, the Company estimates this amount which is recorded as a component of revenue. Cost of Revenue Cost of revenue primarily consists of fees paid to the physicians and other health professionals (“Providers”), costs incurred in connection with the Company’s provider network operations center activities, which include employee-related expenses (including salaries and benefits) as well as costs related to medical records, magnetic resonance imaging, medical lab tests, translation, postage and medical malpractice insurance. Cost of revenue does not include an allocation of depreciation and amortization. Cash and Cash Equivalents Cash and cash equivalents consist of highly liquid investments with original maturities of three months or less from the date of purchase. The Company’s cash and cash equivalents generally consist of investments in money market funds. Cash and cash equivalents are stated at fair value. Short-Term Investments The Company holds short-term investments primarily consisting of corporate bonds, commercial paper, U.S. treasuries and asset backed securities with maturities of less than one year. These short-term investments are classified as available-for-sale and are carried at fair value with unrealized gains or losses recorded as a separate component of stockholders’ equity in accumulated other comprehensive income (loss). Realized gains or losses are recognized in the consolidated statements of operations upon disposition of the securities. As of December 31, 2019, there were no Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. There were no realized losses for the year ended December 31, 2019. Realized losses for the year ended December 31, 2018 and 2017 were less than $0.1 million and were recognized in the Company’s consolidated statements of operations. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recorded at the invoiced amount, net of allowances for doubtful accounts. The allowance for doubtful accounts is based on the Company’s assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for doubtful accounts by considering the collection history and age of each outstanding invoice of each customer to determine whether a specific allowance is appropriate. Accounts receivable deemed uncollectable are charged against the allowance for doubtful accounts when identified. Property and Equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the respective asset as follows: Computer equipment 3 years Furniture and equipment 5 years Leasehold improvements Shorter of the lease term or the estimated useful lives of the improvements Maintenance and repairs are charged to expense as incurred while improvements are capitalized. When assets are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the accounts, and any resulting gain or loss is reflected in the consolidated statement of operations in the period realized. Internal-Use Software Internal-use software is included in intangible assets and is amortized on a straight-line basis over 3 to 5 years. For the Company’s development costs related to its software development tools that enable its Members and Providers to interact, the Company capitalizes costs incurred during the application development stage. Costs related to minor upgrades, minor enhancements and maintenance activities are expensed as incurred. Goodwill and Intangible Assets Goodwill represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired in a business combination. Goodwill is not amortized but is tested for impairment annually on October 1 or more frequently if events or changes in circumstances indicate that the asset may be impaired. The fair value of the reporting unit is estimated using quoted market prices in active markets of the Company’s stock. An impairment charge is recognized for the excess of the carrying value of goodwill over its implied fair value. The Company’s annual goodwill impairment test resulted in no impairment charges in any of the periods presented in the consolidated financial statements. Other intangible assets resulted from business acquisitions and include Client relationships, non-compete agreements, patents and trademarks. Client relationships are amortized over a period of 2 to 20 years in relation to expected future cash flows, while non-compete agreements are amortized over a period of 1.5 to 5 years using the straight-line method. Trademarks are amortized over 3 to 15 years using the straight-line method. Patents are amortized over 3 years using the straight-line method. Long-lived assets (property and equipment, internally developed software, and intangible assets) used in operations are reviewed for impairment whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. For long-lived assets to be held and used, the Company recognizes an impairment loss only if its carrying amount is not recoverable through its undiscounted cash flows and measures the impairment loss based on the difference between the carrying amount and fair value. There were no impairment losses in 2019, 2018 or 2017. Investments in Equity Securities Investments in equity securities, other than those of our consolidated subsidiaries, are accounted for at fair value or under the measurement alternative of the Financial Accounting Standards Board's ("FASB") issued Accounting Standards Update ("ASU") No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, following its adoption on January 1, 2018, with any changes to fair value recognized within other income (expense), net each reporting period. Under the measurement alternative, equity investments without readily determinable fair values are carried at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar securities of the same issuer; value is generally determined based on a market approach as of the transaction date. The Company reviews its investments in equity securities without readily determinable fair values for impairment each reporting period when there are qualitative factors or events that indicate possible impairment. If our assessment indicates that the fair value of the investment is below its carrying value, the Company will write down the investment to its fair value and record the corresponding charge within other income (expense), net. Stock-Based Compensation Stock-based compensation for stock options and restricted stock units granted is measured based on the grant- date fair value of the awards and recognized on a straight-line basis over the period during which the employee is required to perform services in exchange for the award (generally the vesting period of the award). The Company estimates the fair value of employee stock options using the Black-Scholes option-pricing model. Stock-based compensation for performance stock units (PSU) granted is measured based on the grant- date fair value of the awards and recognized on an accelerated tranche by tranche basis over the period during which the employee is required to perform services in exchange for the award (generally the vesting period of the award). The ultimate number of PSUs that are issued to an employee is the result of the actual performance of the Company at the end of the performance period compared to the performance conditions and can range from 50% to 200% of the initial grant. The Company’s Employee Stock Purchase Plan (“ESPP”) permits eligible employees to purchase common stock at a discount through payroll deductions during defined offering periods. Under the ESPP, the Company may specify offerings with durations of not more than 27 months and may specify shorter purchase periods within each offering. Each offering will have one or more purchase dates on which shares of its common stock will be purchased for employees participating in the offering. An offering may be terminated under certain circumstances. The price at which the stock is purchased is equal to the lower of 85% of the fair market value of the common stock at the beginning of an offering period or on the date of purchase. Foreign Currency The functional currency for each of our foreign subsidiaries is the local currency. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at the weighted average exchange rate during the period. Cumulative translation gains or losses are included in stockholders’ equity as a component of accumulated other comprehensive income (loss) . For the year ended December 31, 2019, realized foreign exchange gain was $0.2 million and was recognized in the Company’s consolidated statement of operations in interest expense, net. For the year ended December 31, 2018, realized foreign exchange gain was $0.1 million and was recognized in the Company’s consolidated statement of operations. For the year ended December 31, 2017, realized foreign exchange loss was $0.1 million and was recognized in the Company’s consolidated statement of operations. Income Taxes The Company accounts for income taxes using the liability method, under which deferred tax assets and liabilities are determined based on the future tax consequences attributable to differences between the financial reporting carrying amounts of existing assets and liabilities and their respective tax bases and tax credit carry forwards and net operating loss carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to be in effect when the differences are expected to reverse. The Company assesses the likelihood that deferred tax assets will be recovered from future taxable income, and a valuation allowance is established when necessary to reduce deferred tax assets to the amounts more likely than not expected to be realized. The Company recognizes and measures uncertain tax positions using a two- step approach. The first step is to evaluate the tax position taken or expected to be taken by determining if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. Significant judgment is required to evaluate uncertain tax positions. The Company evaluates its uncertain tax positions on a regular basis. Its evaluations are based on a number of factors, including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during the course of audit and effective settlement of audit issues. The Company’s policy is to include interest and penalties related to unrecognized tax benefits as a component of interest expense, net in the consolidated statements of operations. The Tax Cuts and Jobs Act, was enacted on December 22, 2017. Authoritative accounting guidance requires companies to recognize the effect of tax law changes in the period of enactment. Certain key aspects of the new law were effective January 1, 2018 and other key aspects had an immediate accounting effect for the year ended December 31, 2017. Refer to Note 14. Comprehensive Loss Comprehensive loss consists of net loss and unrealized gains or losses on short-term investments and cumulative translation gains or losses. Unrealized gains or losses are net of any reclassification adjustments for realized gains and losses included in the consolidated statements of operations. Net Loss Per Share Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock of the Company outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including outstanding stock options, warrants and convertible notes, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive. Warranties and Indemnification The Company’s arrangements generally include certain provisions for indemnifying Clients against liabilities if there is a breach of a Client’s data or if the Company’s service infringes a third party’s intellectual property rights. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company has also agreed to indemnify its directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by the Company, arising out of that person’s services as a director or officer or that person’s services provided to any other company or enterprise at the Company’s request. The Company maintains director and officer liability insurance coverage that would generally enable it to recover a portion of any future amounts paid. The Company may also be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions. Advertising and Marketing Expenses Advertising and marketing include all communications and campaigns to the Company’s Clients and Members, digital and media advertising and related employees’ costs and are expensed as incurred. For the years ended December 31, 2019, 2018 and 2017, advertising expenses were $88.8 million, $70.6 million and $45.1 million, respectively. Concentrations of Risk and Significant Clients The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. Although the Company deposits its cash with multiple financial institutions in U.S. and in foreign countries, its deposits, at times, may exceed federally insured limits. The Company’s short-term investments are comprised of a portfolio of diverse high credit rating instruments with maturity durations of one year or less. Revenue from Clients located in the United States for the year ended December 31, 2019, 2018 and 2017 were $445.3 million, $342.7 million and $214.5 million, respectively. Revenue from Clients located outside the United States for the year ended December 31, 2019, 2018 and 2017 were $108.0 million, $75.2 million and $18.8 million, respectively. Reclassifications Certain prior year amounts have been reclassified to conform to the current year presentation. Seasonality The Company typically experiences the strongest increases in consecutive quarterly revenue during the fourth and first quarters of each year, which coincides with traditional annual benefit enrollment seasons. In particular, as a result of many Clients’ introduction of new services at the very end of a calendar year, or the start of each calendar year, the majority of the Company’s new Client contracts have an effective date of January 1. Additionally, as a result of national seasonal cold and flu trends, the Company experiences the highest level of visit fees during the first and fourth quarters of each year when compared to other quarters of the year. Recently Issued and Adopted Accounting Pronouncements In December 2019, FASB issued ASU 2019-12 Simplification of Income Taxes (Topic 740) Income Taxes. ASU 2019-12 . ASU 2019-12 is effective for public companies for annual periods beginning after December 15, 2020, including interim periods within those fiscal years. The standard will apply as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is in the process of evaluating the impact of the adoption of ASU 2019-12 on the Company’s consolidated financial statements and disclosures. In January 2017, the FASB issued ASU 2017-04, Goodwill Simplifications (Topic 350). ASU 2017-04 simplifies the test for goodwill impairment. The new guidance eliminates Step 2 from the goodwill impairment test as currently prescribed in the U.S. generally accepted accounting principle. This ASU is the result of the FASB project focused on simplifications to accounting for goodwill. The new guidance has been adopted in the current period. In June 2016, FASB issued ASU 2016-13 Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments . ASU 2016-13 requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") model to estimate its lifetime "expected credit loss" and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. ASU 2016-13 is effective for public companies for annual periods beginning after December 13, 2019, including interim periods within those fiscal years. The standard will apply as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is in the process of evaluating the impact of the adoption of ASU 2016-13 on the Company's consolidated financial statements and disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 outlines a comprehensive lease accounting model and supersedes the current lease guidance. The new guidance requires lessees to recognize lease liabilities and corresponding right-of-use assets for all leases with lease terms of greater than 12 months. It also changes the definition of a lease and expands the disclosure requirements of lease arrangements. The Company adopted this standard on January 1, 2019 utilizing the modified retrospective approach and reflecting a cumulative effect adjustment at that time. Under this adoption method, prior periods are presented in accordance with the previous guidance in ASC 840, Leases. In adopting the new standard, the Company elected to utilize the available package of practical expedients permitted under the transition guidance within the new standard, which does not require the reassessment of the following: i) whether existing or expired arrangements are or contain a lease, ii) the lease classification of existing or expired leases, and iii) whether previous initial direct costs would qualify for capitalization under the new lease standard. Additionally, the Company made an accounting policy election to keep leases with a term of 12 months or less off of its balance sheet. As part of its adoption, the Company underwent a process of assessing the lease population and determining the impact of the adoption of this standard which resulted in the recognition of operating lease liabilities |