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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 22, 2023 shares | Jul. 28, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) segment $ / shares | Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 1 |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |  |
Number of days of advance notice for contract termination for monthly billing cycles |  |  |  | 5 days |  |  |
Number of days of advance notice for contract termination |  |  |  | 30 days |  |  |
Deferred contract acquisition costs, current |  |  |  | $ 29,634 | $ 20,544 |  |
Deferred contract acquisition costs, non-current |  |  |  | 47,769 | 32,527 |  |
Selling and marketing |  |  |  | 506,241 | 404,209 | $ 394,369 |
Accrued expenses |  |  |  | 125,159 | 99,828 |  |
Accounts payable |  |  |  | $ 29,072 | $ 14,579 |  |
Warrants, exercise price (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |
Stock and warrants issued |  |  |  | $ 15 | $ 14 | 62 |
Capitalized prepaid marketing expense |  |  |  | 32,400 | 32,400 |  |
Prepaid marketing expense |  |  |  | 132,849 | 153,346 |  |
Advertising costs |  |  |  | 51,800 | 45,900 | 41,600 |
Uncertain tax positions |  |  | $ 0 | 1,345 | 1,334 | 0 | $ 0
Unbilled accounts receivable |  |  | 1,479 | 2,256 | 1,030 | 1,479 | $ 2,253
Cash equivalents |  |  |  | 325,900 | 278,200 |  |
Restricted cash |  |  |  | 738 | 375 |  |
Restricted cash, non-current |  |  |  | 0 | 739 |  |
Cash and cash equivalents |  |  |  | $ 1,064,875 | 881,473 |  |
Property, plant and equipment, useful life |  |  |  | 5 years |  |  |
Operating lease, option to extend, renewal term (up to) |  |  |  | 10 years |  |  |
Foreign currency translation gains (losses) |  |  |  | $ 1,600 | 1,000 | 0 |
Impairment of long-lived assets |  |  |  | $ 0 | $ 0 | $ 0 |
Capitalized internal-use software |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  |  | 3 years |  |  |
Total Expenditures Benchmark | Customer One | Customer Concentration Risk |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 18.00% | 17.00% | 19.00% |
Total Expenditures Benchmark | Customer Two | Customer Concentration Risk |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 14.00% | 16.00% | 14.00% |
Total Expenditures Benchmark | Customer Three | Customer Concentration Risk |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Customer concentration risk, percentage |  |  |  | 13.00% | 12.00% | 12.00% |
Interest-Bearing Deposits |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 150,000 |  |  |
Unbilled Revenues |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Unbilled accounts receivable |  |  |  | $ 3,300 | $ 1,700 |  |
Conversion of Redeemable Common Stock Into Series B Common Stock | Series A Common Stock |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Conversion of common stock (in shares) | shares | 64,046,223 |  |  |  |  |  |
ESPP |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
ESPP purchase discount |  |  |  | 15.00% |  |  |
ESPP | Call Option |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Percent look-back feature, portion covered by option |  |  |  | 0.85 |  |  |
ESPP | Put Option |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Percent look-back feature, portion covered by option |  |  |  | 0.15 |  |  |
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Conversion of common stock (in shares) | shares | 3,935,793 |  |  |  |  |  |
Increase in prepaid marketing expense |  |  | $ 92,600 |  |  |  |
Shopify | Private Placement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Shares issued under purchase agreement (in shares) | shares |  | 2,951,846 |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  | $ 33.88 |  |  |  |  |
Shopify | Investment Option |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Issuance price per share (in dollars per share) | $ / shares |  | $ 88.93 |  |  |  |  |
Additional shares available for purchase (in shares) | shares |  | 15,743,174 |  |  |  |  |
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Collaborative arrangement, term |  | 7 years |  |  |  |  |
Collaborative arrangement, renewal term |  | 1 year |  |  |  |  |
Maximum number of common stock shares in which warrants may be converted (in shares) | shares |  | 15,743,174 |  |  |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |  |
Stock and warrants issued |  | $ 370,300 |  |  |  |  |
Marketing expense |  |  |  | $ 52,900 | 52,900 | $ 52,900 |
Prepaid marketing expense |  |  |  | 132,800 | 153,300 |  |
Unrecognized marketing expense |  |  |  | $ 189,500 |  |  |
Warrants, cost not yet recognized, period for recognition |  |  |  | 3 years 7 months 6 days |  |  |
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Class of Warrant or Right, Vesting Period One |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Warrants, vesting percentage | 0.25 | 0.25 |  |  |  |  |
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Class of Warrant or Right, Vesting Periods Two Through Twenty-One |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Warrants, vesting percentage |  | 0.75 |  |  |  |  |
Shopify | Revenue Sharing Agreement |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Revenue from collaborative arrangement exceeding threshold, percentage to be shared |  | 0.15 |  |  |  |  |
Revenue from collaborative arrangement, threshold |  | $ 1,000 |  |  |  |  |
Selling and marketing |  |  |  | $ 33,200 | 27,400 | $ 21,900 |
Accrued expenses |  |  |  | 3,000 | 2,600 |  |
Accounts payable |  |  |  | $ 3,000 | $ 2,500 |  |
Minimum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Deferred contract acquisition costs, capitalized, amortization period |  |  |  | 18 months |  |  |
Operating lease, term of contract |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |
Deferred contract acquisition costs, capitalized, amortization period |  |  |  | 60 months |  |  |
Operating lease, term of contract |  |  |  | 8 years |  |  |

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