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Summary of Significant Accounting Policies - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2023 | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) segment reporting_unit | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Aug. 31, 2023 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |  |  |
Number of operating segments | segment |  |  | 1 |  |  |  |  |
Number of reporting units | reporting_unit |  |  | 1 |  |  |  |  |
Purchases of short-term investments |  |  | $ 86,368,000 | $ 191,093,000 | $ 0 |  |  |
Accrued interest receivable |  |  | 600,000 | 500,000 |  |  |  |
Available-for-sale, debt securities credit losses |  |  | 0 | 0 | 0 |  |  |
Allowance for seller refunds |  |  | $ 100,000 | 200,000 |  |  |  |
Estimated useful life |  |  | 3 years |  |  |  |  |
Impairment of long-lived assets |  |  | $ 0 | 0 | 0 |  |  |
Goodwill impairment losses |  |  | $ 0 | 0 | 0 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 10,000,000 | $ 25,500,000 | $ 20,000,000
Commission fees percentage, minimum |  |  | 5.00% |  |  |  |  |
Commission fees percentage, maximum |  |  | 50.00% |  |  |  |  |
Processing fees percentage |  |  | 3.00% |  |  |  |  |
Contract costs, amortization period |  |  | 3 years |  |  |  |  |
Deferred revenue |  |  | $ 26,000 | 63,000 | 183,000 |  |  |
Deferred revenue |  |  | 100,000 |  |  |  |  |
Advertising expenses |  |  | 13,500,000 | 11,000,000 | 16,300,000 |  |  |
Restructuring costs |  |  | 1,391,000 | 2,004,000 | 660,000 |  |  |
Restructuring accrual |  |  | 1,262,000 | 396,000 |  |  |  |
Employee Severance |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Restructuring accrual |  |  | 1,300,000 |  |  |  |  |
Restructuring accrual, expected to be paid in 2026 |  |  | 100,000 |  |  |  |  |
June 2023, workforce reduction plan |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Reduction in workforce, percentage | 20.00% |  |  |  |  |  |  |
Restructuring costs |  |  |  | 2,000,000 |  |  |  |
September 2022, workforce reduction plan |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Reduction in workforce, percentage |  | 10.00% |  |  |  |  |  |
Restructuring costs |  | $ 700,000 |  |  |  |  |  |
Design Manager |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Joint escrow account |  |  |  |  | 1,500,000 |  |  |
Cash Equivalents |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Purchases of short-term investments |  |  | 28,800,000 | $ 43,100,000 | $ 0 |  |  |
Letter of Credit | New York |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Restricted cash, non-current |  |  | $ 3,700,000 |  |  |  |  |

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