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Stock-Based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
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May 20, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Feb. 28, 2025
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation included in capitalized internal-use software |  | $ 500,000 | $ 1,200,000 | $ 2,000,000.0 | $ 3,200,000 |
Intrinsic value of options exercised |  |  |  | 4,700,000 | 12,500,000 |
Cost not yet recognized for stock options, amount |  | 200,000 |  | 200,000 |  |
Incremental modification expense |  |  |  |  | 1,000,000 |
Sales and marketing |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Incremental modification expense |  |  |  |  | 700,000 |
General and administrative |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Incremental modification expense |  |  |  |  | 300,000 |
Restricted stock units outstanding |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Cost not yet recognized for restricted stock units, amount |  | 31,100,000 |  | $ 31,100,000 |  |
Cost not yet recognized, period for recognition (in years) |  |  |  | 2 years 2 months 12 days |  |
Restricted stock units outstanding | Bonus Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 301,571
Stock-based compensation |  | 0 | 500,000 | $ 2,000,000 | 1,800,000 |
Stock-based compensation included in capitalized internal-use software |  | 0 | 100,000 | $ 200,000 | 200,000 |
Restricted stock units outstanding | Share-Based Payment Arrangement, Nonemployee |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 1 year |  |
Options outstanding |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 4 years |  |
Cost not yet recognized, period for recognition (in years) |  |  |  | 1 month 6 days |  |
Expiration period (in years) |  |  |  | 10 years |  |
Employee Stock | 2021 Employee Stock Purchase Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Cost not yet recognized, period for recognition (in years) |  |  |  | 9 months 18 days |  |
Stock-based compensation |  | 700,000 | 400,000 | $ 1,700,000 | 1,200,000 |
Stock-based compensation included in capitalized internal-use software |  | 0 | $ 100,000 | 200,000 | $ (400,000) |
Cost not yet recognized for stock options, amount |  | $ 2,600,000 |  | $ 2,600,000 |  |
Incremental modification expense | $ 1,000,000 |  |  |  |  |
Maximum | Restricted stock units outstanding | Share-Based Payment Arrangement, Employee |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 4 years |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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