Basis of Presentation and Summary of Significant Accounting Policies | Note 1—Basis of Presentation and Summary of Significant Accounting Policies Description of Business Etsy operates two-sided online marketplaces that connect millions of passionate and creative buyers and sellers. Our primary marketplace, Etsy.com, is the global marketplace for unique and creative goods. The Company generates revenue primarily from transaction, listing, and payments processing fees, and on-site advertising and shipping label services. Basis of Consolidation The consolidated financial statements include the accounts of Etsy and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. On August 15, 2019, Etsy acquired all of the issued and outstanding capital stock of Reverb Holdings, Inc. (“Reverb”). The financial results of Reverb have been included in Etsy’s consolidated financial statements from the date of acquisition. See “Note 5—Business Combinations.” Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires us to make estimates and judgments that affect the amounts reported and disclosed in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates and assumptions. The accounting estimates that require management’s most subjective judgments include: stock-based compensation; income taxes, including the evaluation of uncertain tax positions; purchase price allocations for business combinations, valuation of the acquired intangibles purchased in a business combination, and valuation of goodwill and intangible assets; leases, including determining the incremental borrowing rate; and fair value of convertible senior notes. As of December 31, 2020, the effects of the ongoing COVID-19 pandemic on our business, results of operations, and financial condition continue to evolve. A s a result, many of our estimates and assumptions required increased judgment and carry a higher degree of variability and volatility. As additional information becomes available, our estimates may change materially in future periods. Revenue Recognition The Company accounts for revenue in accordance with ASC Topic 606 —Revenue from Contracts with Customers (“ASC 606”), which the Company adopted on January 1, 2018 using the full retrospective method of transition. The Company’s revenue is diversified; generated from a mix of marketplace activities and other optional services to help sellers generate more sales and scale their businesses. Revenues are recognized as the Company transfers control of promised goods or services to sellers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The Company evaluates whether it is appropriate to recognize revenue on a gross or net basis based upon its evaluation of whether the Company obtains control of the specified goods or services by considering if it is primarily responsible for fulfillment of the promise, has inventory risk, and has the latitude in establishing pricing and selecting suppliers, among other factors. Based on its evaluation of these factors, revenue is recorded either gross or net of costs associated with the transaction. With the exception of shipping labels, the Company’s revenues are recognized on a gross basis. Sales and usage-based taxes are excluded from revenues. Etsy Marketplace revenue: As members of the Etsy marketplace, Etsy sellers receive the benefit of marketplace activities, including listing items for sale, completing sales transactions, and payments processing, which represents a single stand-ready performance obligation. Etsy sellers pay a fixed listing fee of $0.20 for each item listed on Etsy.com for a period of four months or, if earlier, until a sale occurs. Variable fees include the 5% transaction fee that an Etsy seller pays for each completed transaction, inclusive of shipping fees charged, and where applicable, an additional transaction fee of 12% or 15% related to offsite advertising, and Etsy Payments fees for processing payments, including foreign currency payments. On July 16, 2018, the Company increased the seller transaction fee from 3.5% to 5% of each completed transaction, and now applies it to the cost of shipping in addition to the cost of the item. In May 2020, Etsy started charging sellers on its marketplace platform for Offsite Ads, whereby sellers will pay Etsy an advertising fee of 12% or 15% of the value of a sale based on the seller’s volume of sales, if such sale is generated from an advertisement placed by Etsy on third-party internet platforms. The corresponding expense is recorded in marketing. Etsy Payments processing fees vary between 3.0% and 4.5% of an item’s total sale price, including shipping, plus a flat fee per order, depending on the country in which a seller’s bank account is located. When a foreign currency payment is processed, an additional transaction fee is applied. The listing fee is recognized ratably over a four-month listing period, unless the item is sold or the seller re-lists it, at which time any remaining listing fee is recognized. The transaction fee, Offsite Ads transaction fee, and Etsy Payments processing fees are recognized when the corresponding transaction is consummated. Listing fees are nonrefundable while transaction fees, Offsite Ads transaction fees, and Etsy Payments processing fees are recorded net of refunds. Reverb Marketplace revenue: The Reverb seller transaction fee is a variable fee, which is 5% of each completed transaction, including both the cost of the item and the shipping. In August 2020, Reverb increased its seller transaction fee from 3.5% to 5%. There are no Reverb listing fees. Variable fees also include payments fees for processing payments, including foreign currency payments. Payments processing fees vary between 2.5% and 2.7% of an item’s total sale price, including shipping and any applicable sales tax, plus a flat fee per order, depending on the currency in which a listing is denominated. International transactions incur a 1% additional cross-border fee. Etsy Services revenue: Services revenue is derived from optional services offered to Etsy sellers, which primarily include on-site advertising services (formerly Promoted Listings) and Etsy Shipping Labels. Each service below represents an individual obligation that the Company must perform when an Etsy seller chooses to use the service. • During the second quarter of 2020, Etsy transitioned from a combined “Etsy Ads” on-site and offsite advertising offering to two separate advertising offerings: Offsite Ads, with 12% or 15% transaction fees reported in Marketplace revenue, and Etsy Ads, the new name for the Company’s on-site product (formerly Promoted Listings), with advertising fees reported in Services revenue. Revenue from Etsy Ads consists of cost-per-click fees an Etsy seller pays for prominent placement of her listings in search results in the Etsy.com marketplace. The previous combined “Etsy Ads” offering was available from the third quarter of 2019 to the beginning of the second quarter of 2020. Under this offering, Etsy streamlined Promoted Listings and Google Shopping, an off-site marketing tool for Etsy sellers, into one unified ad platform, where Etsy sellers could set a budget, which allowed Etsy to allocate that budget between channels, targeting optimal return on seller spend. Revenue from this unified ad platform consisted of cost-per-click fees, which were nonrefundable and were charged to a seller’s Etsy bill when the ad was clicked. This unified ad platform was replaced by the new on-site Etsy Ads product. The revenue that the Company recognized related to the unified ad platform was recorded on a gross basis in Services revenue with an offsetting expense recorded in cost of revenue. Prior to the unified ad platform, revenue from Promoted Listings consisted of cost-per-click fees an Etsy seller paid the Company for prominent placement of her listings in search results in the Company’s marketplace. Promoted Listing fees were nonrefundable and were charged to a seller’s Etsy bill when the Promoted Listing was clicked, at which time revenue was recognized. • Revenue from Etsy Shipping Labels consists of fees an Etsy seller pays the Company when she purchases shipping labels through its platform, net of the cost the Company incurs in purchasing those shipping labels. The Company provides its sellers access to purchase shipping labels at discounted pricing due to the volume of purchases through its platform. The Company recognizes Etsy Shipping Labels revenue when an Etsy seller purchases a shipping label. The Company recognizes Etsy Shipping Labels revenue on a net basis as it is an agent in this arrangement and does not take control of shipping labels prior to transferring the labels to the Etsy seller. Etsy Shipping Label revenue is recorded net of refunds. Reverb Services revenue : Reverb has its own on-site advertising service called Bump advertising. Reverb sellers have the ability to determine their own ad rate as a percentage of their item’s final sale price. Revenue from Bump advertising is recognized at the time the item is sold. Reverb also provides its sellers access to purchase shipping labels at discounted pricing due to the volume of purchases through its platform. Revenue from shipping labels consists of fees a Reverb seller pays when they purchase shipping labels directly through the Reverb platform, net of the cost the shipping company charges Reverb. Reverb recognizes shipping label revenue when a Reverb seller purchases a shipping label. Reverb recognizes shipping label revenue on a net basis as it is an agent in this arrangement and does not take control of shipping labels prior to transferring the labels to the Reverb seller. Shipping label revenue is recorded net of refunds. Contract balances: The Company records deferred revenues when cash payments are received or due in advance of the completion of the listing period, which represents the value of the Company’s unsatisfied performance obligations. Deferred listing revenue is recognized ratably over the remainder of the four-month listing period, unless the item is sold or the seller re-lists it, at which time any remaining listing fee is recognized. The amount of revenue recognized in the year ended December 31, 2020 that was included in the deferred balance at January 1, 2020 was $7.6 million. Cost of Revenue Cost of revenue primarily consists of the cost of interchange and other fees for credit card processing services, credit card verification service fees, and credit card chargebacks to support payments revenue, and costs of refunds made to buyers that the Company is not able to collect from sellers. Cost of revenue also includes expenses associated with the operation and maintenance of the Company’s platform, including employee-related costs, hosting and bandwidth costs, and depreciation and amortization. With the shift to the combined “Etsy Ads” offering from the third quarter of 2019 to the beginning of the second quarter of 2020, amounts spent on Google Shopping, which were previously recorded on a net basis in Services revenue, were recorded on a gross basis in Services revenue with an offsetting expense recorded in cost of revenue. Marketing Marketing expenses primarily consist of direct marketing expenses, which largely includes digital marketing and television ad and digital video expenses. Digital marketing, also referred to as performance marketing, primarily consists of targeted promotional campaigns through electronic channels, such as product listing ads, search engine marketing, social channels, and affiliate programs, which are focused on buyer acquisition and retargeting. Marketing expenses also include employee-related expenses to support the Company’s marketing initiatives. Advertising expenses are recognized as incurred, with the exception of certain production expenses related to television and display advertising which are deferred until the first time an advertisement airs or is published. If such advertising is not expected to occur, costs are expensed immediately. Advertising expenses related to direct marketing, included in marketing expenses on the Consolidated Statements of Operations, were $442.2 million, $175.2 million, and $129.1 million in the years ended December 31, 2020, 2019, and 2018, respectively. Product Development Product development expenses consist primarily of employee-related expenses for engineering, product management, product design, and product research activities, net of costs capitalized to website development and internal-use software. Additional expenses include consulting costs related to the development, quality assurance, and testing of new technology and enhancement of our existing technology. Stock-Based Compensation The Company accounts for our stock-based compensation awards in accordance with ASC Topic 718 —Compensation—Stock Compensation (“ASC 718”). Stock options and restricted stock units (“RSUs”) are awarded to employees and members of the Company’s Board of Directors and are measured at fair value at each grant date. The Company calculates the fair value of stock options on the date of grant using the Black-Scholes option-pricing model and the expense is recognized over the requisite service period. The Company uses the closing price of its common stock on Nasdaq as the fair value of its common stock. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatilities are based on implied volatilities from market comparisons of Etsy and certain publicly traded companies. The expected term of stock options granted has been determined using the simplified method, which uses the midpoint between the vesting date and the contractual term. The fair value of RSUs is determined based on the closing price of the Company’s common stock on Nasdaq on the grant date. The requisite service period for stock options and RSUs is generally four years from the date of grant. The Company recognizes forfeitures as they occur. Foreign Currency The Company has determined that the functional currency for each of its foreign operations is the currency of the primary cash flow of the operations, which is generally the local currency in which the operation is located. All assets and liabilities are translated into U.S. dollars using exchange rates in effect at the balance sheet date. Revenue and expenses are translated using average exchange rates during the period. Foreign currency translation adjustments are reflected in stockholders’ equity as a component of other comprehensive income (loss). Transaction gains and losses including intercompany balances denominated in a currency other than the functional currency of the entity involved are included in foreign exchange gain (loss) within other income (expense) in the Consolidated Statement of Operations. Income Taxes The income tax benefit is based on income before income taxes and is accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to settle. The Company recognizes future tax benefits, such as net operating losses and tax credits, to the extent that realizing these benefits is considered in its judgment to be more likely than not. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as income or expense in the period that includes the enactment date. The Company regularly reviews the recoverability of its deferred tax assets by considering its historic profitability, projected future taxable income, timing of the reversals of existing temporary differences and the feasibility of its tax planning strategies. Where appropriate, the Company records a valuation allowance against deferred tax assets that are deemed not more likely than not to be realizable. On December 22, 2017 the Tax Cuts and Jobs Act of 2017 (the “TCJA”) was signed into law. The TCJA requires the Company to make an accounting policy election of either (1) treating taxes due on future U.S. inclusions in taxable income related to Global Intangible Low Taxed Income (“GILTI”) as a current period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has recorded tax expense related to GILTI in its effective tax rate beginning in 2018, and has elected to treat taxes due on future U.S. inclusions in taxable income related to GILTI as a current period expense when incurred using the period cost method. The Company accounts for uncertainty in income taxes using a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by the taxing authorities. The amount recognized is measured as the largest amount of benefit that has a greater than 50% likelihood of being realized upon ultimate audit settlement. The Company recognizes interest and penalties, if any, associated with income tax matters as part of the income tax provision and includes accrued interest and penalties with the related income tax liability in the Consolidated Balance Sheets. Net Income Per Share Basic net income per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted net income per share is computed by dividing net income adjusted on an if-converted basis for the period by the weighted-average number of shares of common stock and potentially dilutive common stock outstanding during the period. Potentially dilutive shares, which are based on the weighted-average shares of common stock underlying outstanding stock-based compensation awards and convertible senior notes using the treasury stock method or the if-converted method, as applicable, are included when calculating net income per share of common stock attributable to common stockholders when their effect is dilutive. The calculation of diluted net income per share excludes all anti-dilutive common shares. Segment Data The Company identifies operating segments as components of an entity for which discrete financial information is available and is regularly reviewed by the chief operating decision maker in making decisions regarding resource allocation and performance assessment. The Company defines the term “chief operating decision maker” to be its chief executive officer. The Company has determined it has two operating segments, Etsy and Reverb, which qualify for aggregation as one reportable segment, for purposes of allocating resources and evaluating financial performance. Cash and Cash Equivalents, and Short- and Long-term Investments The Company considers all investments with an original maturity of three months or less at time of purchase to be cash equivalents. Cash restricted by third parties is not considered cash and cash equivalents. Short-term investments, consisting of certificates of deposit, commercial paper, corporate bonds, and U.S. Government and agency securities with original maturities of greater than three months but less than one year when purchased, are classified as available-for-sale and are reported at fair value using the specific identification method. Long-term investments, consisting of certificates of deposit, corporate bonds, and U.S. Government and agency securities with original maturities of greater than twelve months but less than 37 months when purchased, are classified as available-for-sale and are reported at fair value using the specific identification method. Unrealized gains and losses are excluded from earnings and reported as a component of other comprehensive income (loss), net of related estimated income tax expenses or benefits. The following table provides cash and cash equivalents, and short- and long-term investments within the Consolidated Balance Sheets as of the dates indicated (in thousands): As of December 31, 2020 2019 Cash and cash equivalents $ 1,244,099 $ 443,293 Short-term investments 425,119 373,959 Long-term investments 39,094 89,343 Total cash and cash equivalents, and short- and long-term investments $ 1,708,312 $ 906,595 Restricted Cash The Company classifies any cash balances that are legally restricted as to withdrawal or usage as restricted cash on the Consolidated Balance Sheets. In connection with the Company’s noncancellable Brooklyn lease agreement, which expires in 2026, the Company established a $5.3 million collateral account, which is reflected in the restricted cash balance as of December 31, 2020 and 2019. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents, short- and long-term investments, and funds receivable and seller accounts. The Company reduces credit risk by placing its cash and cash equivalents with major financial institutions with high credit ratings. At times, to the extent eligible, such amounts may exceed federally insured limits. The Company believes that minimal credit risk exists with respect to these investments due to the credit ratings of the financial institutions that hold its short- and long-term investments. In addition, funds receivable settle relatively quickly, and the Company’s historical experience of losses has not been significant. Fair Value of Financial Instruments Management believes that the fair value of financial instruments, consisting of cash and cash equivalents, short- and long-term investments, accounts receivable, funds receivable and seller accounts, accounts payable, and funds payable and seller accounts approximates carrying value due to the immediate or short-term maturity associated with these instruments. In accounting for the issuance of the 0.125% Convertible Senior Notes due 2027 (the “2020 Notes”), 0.125% Convertible Senior Notes due 2026 (the “2019 Notes”), and 0% Convertible Senior Notes due 2023 (the “2018 Notes”and together with the 2020 Notes and the 2019 Notes, the “Notes”), and the extinguishment of the 2018 Notes, discussed in “Note 13—Debt,” management used estimates and assumptions to calculate the carrying amounts of the liability and equity components by measuring the fair value of similar securities. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. To measure the fair value of a similar liability that does not have an associated convertible feature, the Company discounted the contractual cash flows of each of the Notes at an estimated interest rate for a comparable liability. The carrying amount of the equity component, representing the conversion option, which does not meet the criteria for separate accounting as a derivative as it is indexed to the Company’s stock, was determined by deducting the fair value of the liability component from the par value of each of the Notes. Subsequent to their issuance, the Notes are not measured at fair value in the Consolidated Balance Sheets, but the Company estimates the fair value of the liability component of the Notes through inputs that are observable in the market or that could be derived from observable market data, corroborated with quoted market prices of similar instruments. See Note 8—Fair Value Measurements for more information on the fair value of the liability component of the Notes. Accounts Receivable and Provision for Expected Credit Losses The Company’s trade accounts receivable are recorded at amounts billed to sellers and are presented on the Consolidated Balance Sheets net of the provision for expected credit losses. The provision is determined by a number of factors, including age of the receivable, current economic conditions, historical losses, and management’s assessment of the financial condition of sellers. Receivables are written off once they are deemed uncollectible. Estimates of uncollectible accounts receivable are recorded to general and administrative expense. Etsy payment terms: As of November 13, 2018, for Etsy sellers using Etsy Payments, all charges, including listing fees, transactions fees, Etsy Payments fees, advertising services fees, and Etsy Shipping Labels fees, are deducted from the funds credited to the seller’s shop payment account in the seller’s ledger currency prior to settlement of those funds to the seller’s bank account. Etsy sellers receive a statement electronically on the first day of each month outlining the previous month’s charges and any remaining amount due after the Company’s fees are deducted from the seller’s shop payment account. Etsy sellers who do not use Etsy Payments receive a statement electronically on the first day of each month for the previous month’s charges in U.S. dollars, including all listing fees, transactions fees, advertising services fees, and Etsy Shipping Labels fees. Payment is due by the 15th of every month. Prior to November 13, 2018, Etsy sellers would receive a statement electronically on the first day of each month for the previous month’s charges in U.S. dollars, including all listing fees, transactions fees, advertising services fees, and Etsy Shipping Labels fees. Payment was due by the 15th of every month. Prior to November 13, 2018 only Etsy Payments fees were deducted from the funds credited to the seller’s shop payment account in the seller’s ledger currency prior to settlement of those funds to the seller’s bank account. Reverb payment terms: For most transactions, Reverb buyers use a credit card to pay for the service, when the order is placed. For these transactions, the Company collects the total amount due on the order, retains its fees due from the Reverb seller, and remits the net proceeds to the Reverb seller. The following table provides a rollforward of the allowance for credit losses that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected (in thousands): Year Ended 2020 2019 2018 Balance as of the beginning of period $ 5,033 $ 4,720 $ 2,687 Provision for expected credit losses 15,033 10,963 4,124 Amounts written off, net of recoveries (10,309) (10,650) (2,091) Balance as of the end of period $ 9,757 $ 5,033 $ 4,720 Funds Receivable and Seller Accounts and Funds Payable and Amounts due to Sellers The Company records funds receivable and seller accounts and funds payable and amounts due to sellers as current assets and liabilities, respectively, on the Consolidated Balance Sheets. Funds receivable and seller accounts represent amounts received or expected to be received from buyers via third-party credit card processors, which flow through a bank account for payment to sellers. This cash and related receivable represent the total amount due to sellers, and as such a liability for the same amount is recorded to funds payable and amounts due to sellers. Property and Equipment Property and equipment, consisting principally of capitalized website development and internal-use software, building, leasehold improvements, and computer equipment, are recorded at cost. Depreciation and amortization begin at the time the asset is placed into service and is recognized using the straight-line method in amounts sufficient to relate the cost of depreciable and amortizable assets to the Consolidated Statements of Operations over their estimated useful lives. Repairs and maintenance are charged to the Consolidated Statements of Operations as incurred. Upon sale or retirement of assets, the cost and related accumulated depreciation or amortization are removed from the balance sheet and the resulting gain or loss is reflected in the Consolidated Statements of Operations. When events or changes in circumstances require, the Company assesses the likelihood of recovering the cost of tangible long-lived assets based on its expectations of future profitability, undiscounted cash flows, and management’s plans with respect to operations to determine if the asset is impaired and subject to write-off. Measurement of any impairment loss is based on the excess of the carrying value of the asset over the fair value. Website Development and Internal-use Software Costs Costs incurred to develop the Company’s website and software for internal-use are capitalized and amortized over the estimated useful life of the software, generally three If an asset will continue to be used, but the net book value is not expected to be fully recoverable, the asset is impaired to its fair value. When events or changes in circumstances require, the Company assesses the likelihood of recovering the cost of website development and internal-use software costs based on its expectations of future profitability, undiscounted cash flows, and our plans with respect to operations to determine if the asset is impaired and subject to write-off. Measurement of any impairment loss is based on the excess of the carrying value of the asset over the fair value. Capitalized website development and internal-use software costs are included in property and equipment within the Consolidated Balance Sheets. Business Combinations In accordance with the guidance for business combinations, the Company determines whether a transaction is a business combination, which requires that the assets acquired and liabilities assumed constitute a business. The Company accounts for business combinations using the acquisition method of accounting. If the assets acquired are not a business, we account for the transaction as an asset acquisition. Under both methods, the purchase price is allocated to the assets acquired and liabilities assumed using the fair values determined by management as of the acquisition date. The results of businesses acquired in a business combination are included in the Company’s consolidated financial statements from the date of acquisition. Determining the fair value of assets acquired and liabilities assumed requires management to use significant judgment and estimates, including estimates of future revenue and adjusted earnings before interest and taxes and discount rates. Our estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ materially from estimates. Our estimates associated with the accounting for business combinations may change as additional information becomes available regarding the assets acquired and liabilities assumed. Any change in facts and circumstances that existed as of the acquisition date and impacts our preliminary estimates is recorded to goodwill if identified within the measurement period. Subsequent to the measurement period or our final determination of fair value of assets and liabilities, whichever is earlier, the adjustments will affect our earnings. Acquisition-related expenses incurred by the Company in a business combination are not included as a component of consideration transferred, but are accounted for as an expense in the period in which the costs are incurred. Goodwill Goodwill represents the excess of the aggregate fair value of the consideration transferred in a business combination over the fair value of the assets acquired, net of liabilities assumed. The Company performs its annual goodwill impairment test during the fourth quarter or more frequently if events or changes in circumstances indicate that the goodwill may be impaired. Management has determined that the Company has two operating segments, Etsy and Reverb, which qualify for aggregation as one reportable segment, for purposes of allocating resources and evaluating financial performance, and each operating segment is determined to be a reporting unit. The Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair |