Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements are prepared in accordance with the accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries, 1stdibs.com, Ltd. and 1stdibs Design Manager, Inc. (“Design Manager”). The Company sold its equity interest in Design Manager on June 29, 2022, therefore, the condensed consolidated statements of operations for the three and six months ended June 30, 2022 includes activity relating to Design Manager. The condensed consolidated balance sheet as of June 30, 2023 no longer includes the assets, liabilities, and equity amounts associated with Design Manager. All intercompany accounts and transactions have been eliminated in consolidation. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K (the “Form 10-K”) for the fiscal year ended December 31, 2022, filed with the Securities and Exchange Commission (“SEC”) on March 3, 2023. The condensed consolidated balance sheet as of December 31, 2022, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures including certain notes required by GAAP on an annual reporting basis. In the opinion of the Company, the accompanying unaudited condensed consolidated financial statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair presentation of its financial position and its results of operations, changes in stockholders’ equity, and cash flows for the interim periods. The results for the three and six months ended June 30, 2023 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending December 31, 2023.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, revenue recognition, provision for transaction losses, determination of useful lives of property and equipment, impairment assessment of goodwill, capitalization of internal-use software and determination of useful lives, stock option valuations, the incremental borrowing rate associated with lease liabilities, and income taxes. The Company evaluates its estimates and assumptions on an ongoing basis. Actual results could differ from those estimates and such differences may be material to the condensed consolidated financial statements.
Cash, Cash Equivalents, and Restricted Cash	The Company considers all short-term, highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Certain cash equivalents consist of investments in debt securities that are classified as available-for-sale. During the three and six months ended June 30, 2023, the Company purchased $19.9 million and $31.8 million of available-for-sale securities classified as cash equivalents, respectively. The Company’s restricted cash relates to a $3.3 million Letter of Credit for its office lease in New York, New York. Prior to June 30, 2023, $1.5 million was held in a joint escrow account in connection with the sale of Design Manager. As of June 30, 2023 the restriction was lifted and the funds were released. The carrying value of the restricted cash approximates fair value.
Short-term Investments	Short-term Investments Short-term investments designated as available-for-sale securities are carried at fair value, which is based on quoted market prices for such securities, if available, or is estimated on the basis of quoted market prices of financial instruments with similar characteristics. Investments with original maturities greater than 90 days and less than one year are classified within short-term investments on the Company’s condensed consolidated balance sheets. In addition, investments with maturities beyond one year at the time of purchase that are highly liquid in nature and represent the investment of cash that is available for current operations are classified as short-term investments. Any other investments with original maturities greater than one year would be classified within long-term investments. Unrealized gains and losses of available-for-sale securities are excluded from earnings and are reported as a component of other comprehensive income (loss) until the security is sold, has matured, or the Company determines that the fair value of the security has declined below its adjusted cost basis and the decline is not due to a credit loss. Realized gains and losses on short-term investments are calculated based on the specific identification method and would be reclassified from accumulated other comprehensive loss to other, net in the Company’s condensed consolidated statements of operations. Short-term investments are evaluated for impairment quarterly. The Company’s portfolio of available-for-sale debt securities is required to incorporate forward-looking information to determine any credit losses. This risk is mitigated by the high quality nature of the investments. The Company evaluates the current expected credit loss by considering various factors in determining whether it should recognize an impairment charge, including the credit quality of the issuer, the duration that the fair value has been less than the adjusted cost basis, the severity and reason for the decline in value, and the Company’s intent to sell and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value. If the Company concluded that an investment is impaired or a portion of the unrealized loss is a result of a credit loss, it recognizes the charge at that time in the condensed consolidated statements of operations. Determining whether the decline in fair value is due to a credit loss requires management judgment based on the specific facts and circumstances of each security. The ultimate value realized on these securities is subject to market price volatility until they are sold.
Accounts Receivable, net	Accounts Receivable, net The Company’s accounts receivable are recorded at amounts billed to sellers, generally for subscription revenue, and are presented net of an estimated allowance for doubtful accounts on the Company’s consolidated balance sheets. The Company’s accounts receivable do not bear interest and do not require collateral or other security to support related receivables. The allowance for doubtful accounts considers forward-looking information to estimate expected credit losses using a number of factors, including age of the receivable, current economic conditions, historical losses, and management’s assessment and judgement of the seller. The evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Losses are charged against the allowance when management believes the un-collectability of a receivable is confirmed and subsequent recoveries, if any, are credited to the allowance. Account balances are written off after all means of collection are exhausted and the potential for non-recovery is determined to be probable. Adjustments to the allowance for doubtful accounts are recorded as a component of provision for transaction losses in the condensed consolidated statements of operations.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which replaces the incurred loss impairment methodology with a methodology that requires the reflection of expected credit losses and also requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. For most financial instruments, the standard requires the use of a forward-looking expected loss model rather than the incurred loss model for recognizing credit losses, which generally results in the earlier recognition of credit losses on financial instruments. The Company adopted this standard effective January 1, 2023 under a modified retrospective basis and considers forward-looking information to estimate expected credit losses. No adjustment to accumulated deficit was recorded as the adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements are prepared in accordance with the accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries, 1stdibs.com, Ltd. and 1stdibs Design Manager, Inc. (“Design Manager”). The Company sold its equity interest in Design Manager on June 29, 2022, therefore, the condensed consolidated statements of operations for the three and six months ended June 30, 2022 includes activity relating to Design Manager. The condensed consolidated balance sheet as of June 30, 2023 no longer includes the assets, liabilities, and equity amounts associated with Design Manager. All intercompany accounts and transactions have been eliminated in consolidation. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K (the “Form 10-K”) for the fiscal year ended December 31, 2022, filed with the Securities and Exchange Commission (“SEC”) on March 3, 2023.

The condensed consolidated balance sheet as of December 31, 2022, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures including certain notes required by GAAP on an annual reporting basis.

In the opinion of the Company, the accompanying unaudited condensed consolidated financial statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair presentation of its financial position and its results of operations, changes in stockholders’ equity, and cash flows for the interim periods. The results for the three and six months ended June 30, 2023 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending December 31, 2023.

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, revenue recognition, provision for transaction losses, determination of useful lives of property and equipment, impairment assessment of goodwill, capitalization of internal-use software and determination of useful lives, stock option valuations, the incremental borrowing rate associated with lease liabilities, and income taxes. The Company evaluates its estimates and assumptions on an ongoing basis. Actual results could differ from those estimates and such differences may be material to the condensed consolidated financial statements.

Cash, Cash Equivalents, and Restricted Cash

The Company considers all short-term, highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Certain cash equivalents consist of investments in debt securities that are classified as available-for-sale. During the three and six months ended June 30, 2023, the Company purchased $19.9 million and $31.8 million of available-for-sale securities classified as cash equivalents, respectively. The Company’s restricted cash relates to a $3.3 million Letter of Credit for its office lease in New York, New York. Prior to June 30, 2023, $1.5 million was held in a joint escrow account in connection with the sale of Design Manager. As of June 30, 2023 the restriction was lifted and the funds were released. The carrying value of the restricted cash approximates fair value.

Short-term Investments

Short-term investments designated as available-for-sale securities are carried at fair value, which is based on quoted market prices for such securities, if available, or is estimated on the basis of quoted market prices of financial instruments with similar characteristics. Investments with original maturities greater than 90 days and less than one year are classified within short-term investments on the Company’s condensed consolidated balance sheets. In addition, investments with maturities beyond one

year at the time of purchase that are highly liquid in nature and represent the investment of cash that is available for current operations are classified as short-term investments. Any other investments with original maturities greater than one year would be classified within long-term investments.

Unrealized gains and losses of available-for-sale securities are excluded from earnings and are reported as a component of other comprehensive income (loss) until the security is sold, has matured, or the Company determines that the fair value of the security has declined below its adjusted cost basis and the decline is not due to a credit loss. Realized gains and losses on short-term investments are calculated based on the specific identification method and would be reclassified from accumulated other comprehensive loss to other, net in the Company’s condensed consolidated statements of operations.

Short-term investments are evaluated for impairment quarterly. The Company’s portfolio of available-for-sale debt securities is required to incorporate forward-looking information to determine any credit losses. This risk is mitigated by the high quality nature of the investments. The Company evaluates the current expected credit loss by considering various factors in determining whether it should recognize an impairment charge, including the credit quality of the issuer, the duration that the fair value has been less than the adjusted cost basis, the severity and reason for the decline in value, and the Company’s intent to sell and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value. If the Company concluded that an investment is impaired or a portion of the unrealized loss is a result of a credit loss, it recognizes the charge at that time in the condensed consolidated statements of operations. Determining whether the decline in fair value is due to a credit loss requires management judgment based on the specific facts and circumstances of each security. The ultimate value realized on these securities is subject to market price volatility until they are sold.

Accounts Receivable, net

The Company’s accounts receivable are recorded at amounts billed to sellers, generally for subscription revenue, and are presented net of an estimated allowance for doubtful accounts on the Company’s consolidated balance sheets. The Company’s accounts receivable do not bear interest and do not require collateral or other security to support related receivables. The allowance for doubtful accounts considers forward-looking information to estimate expected credit losses using a number of factors, including age of the receivable, current economic conditions, historical losses, and management’s assessment and judgement of the seller. The evaluation is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available. Losses are charged against the allowance when management believes the un-collectability of a receivable is confirmed and subsequent recoveries, if any, are credited to the allowance. Account balances are written off after all means of collection are exhausted and the potential for non-recovery is determined to be probable. Adjustments to the allowance for doubtful accounts are recorded as a component of provision for transaction losses in the condensed consolidated statements of operations.

Recently Adopted Accounting Pronouncements

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses, which replaces the incurred loss impairment methodology with a methodology that requires the reflection of expected credit losses and also requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. It also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. For most financial instruments, the standard requires the use of a forward-looking expected loss model rather than the incurred loss model for recognizing credit losses, which generally results in the earlier recognition of credit losses on financial instruments.

The Company adopted this standard effective January 1, 2023 under a modified retrospective basis and considers forward-looking information to estimate expected credit losses. No adjustment to accumulated deficit was recorded as the adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements.

- Definition

Disclosure of accounting policy for investment in financial asset.

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