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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Jul. 24, 2024 USD ($) shares | Jul. 23, 2024 USD ($) | Dec. 20, 2023 shares | May 16, 2023 shares | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) subsidiary | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) office_space | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2024 USD ($) reporting_unit $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) | Dec. 19, 2023 shares | Dec. 12, 2023 $ / shares | Mar. 10, 2021 $ / shares | Jan. 31, 2021 $ / shares
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  | $ 0.001 |  |
Common stock, shares authorized (in shares) | shares |  |  | 13,750,000 |  |  |  |  | 13,750,000 |  |  |  |  | 13,750,000 |  | 13,750,000 |  |  |  | 275,000,000 |  |  |
Number of shares authorized (in shares) | shares |  |  | 118,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 380,000,000 |  |  |
Stockholders' equity, reverse stock split |  |  | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  | $ 0.001 | $ 0.001
Convertible redeemable preferred stock, net of issuance costs (in shares) | shares | 13,257,294 |  |  |  |  |  |  |  |  |  |  |  | 13,257,294 | [1] |  |  |  |  |  |  |  |
Dividends payable | $ 32,800 |  |  |  |  |  |  | $ 24,100 |  |  |  |  | $ 9,000 |  | $ 24,100 |  |  |  |  |  |  |
Preferred stock, special dividend threshold | 47,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  | 47,000 |  |  |  |  |  |  |  |  |
Liquidation preference | $ 32,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized internally developed software costs |  |  |  |  |  |  |  |  |  |  |  |  | 22,800 |  | 22,400 |  | $ 17,200 |  |  |  |  |
Depreciation of capitalized software costs |  |  |  |  |  |  |  |  |  |  |  |  | 20,400 |  | 18,100 |  | 15,100 |  |  |  |  |
Contingent consideration liability |  |  |  |  |  |  |  | 1,200 |  |  | $ 4,900 |  |  |  | 1,200 |  | 4,900 |  |  |  |  |
Capitalized implementation costs, net of accumulated amortization |  |  |  |  |  |  |  | 3,500 |  |  |  |  | $ 2,200 |  | 3,500 |  |  |  |  |  |  |
Amortization period (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Capitalized implementation costs, amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  | 1,400 |  | 1,400 |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  | $ 63,000 | 34,100 |  | $ 44,100 |  | $ 46,300 | $ 63,000 |  | 78,200 |  | 46,300 |  |  |  |  |
Operating lease, number of office spaces abandoned | office_space |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of right-of-use and long-lived assets |  |  |  |  |  |  | $ 1,400 |  | $ 1,500 |  | $ 200 |  | $ 1,397 |  | 1,502 |  | 156 |  |  |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  |  |  | Other current liabilities |  |  |  |  |  |  |  |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  |  |  | Other Liabilities, Noncurrent |  |  |  |  |  |  |  |  |
Fair value of non-cash consideration received |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300 |  | 4,200 |  | 3,900 |  |  |  |  |
Amounts included in expense related to nonmonetary transactions |  |  |  |  |  |  |  |  |  |  |  |  | 4,300 |  | 4,300 |  | 4,100 |  |  |  |  |
Convertible redeemable preferred stock dividends |  |  |  |  | $ 15,500 |  |  |  |  |  |  |  | $ 17,600 | [2] | $ 16,270 | [2] | $ 15,513 | [2] |  |  |  |
Employees, Directors and Certain Consultants | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture rate |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  | 10.00% |  | 10.00% |  |  |  |  |
Senior Executives | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00% |  | 0.00% |  |  |  |  |
Measurement Input, Discount Rate | Income approach |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROU assets and leasehold improvements, measurement input |  |  |  |  |  |  | 0.093 |  |  |  | 0.074 |  | 0.093 |  |  |  | 0.074 |  |  |  |  |
Shareablee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of wholly owned subsidiaries | subsidiary |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration |  |  |  |  |  | $ 31,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  |  |  | 5,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration scheduled payments |  |  |  |  |  |  |  | $ 3,700 |  |  |  |  | $ 3,700 |  | $ 3,700 |  |  |  |  |  |  |
Contingent consideration, liability expected to be settled in next twelve months |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |
Computer software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internal-use software, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Maximum | Shareablee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  |  |  | $ 8,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | Liberty | Qurate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares |  |  |  | 27,509,203 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Transactions for these line items were exclusively with related parties (refer to Footnote 4, Convertible Redeemable Preferred Stock and Stockholders' Equity (Deficit), and Footnote 13, Related Party Transactions, of the Notes to Consolidated Financial Statements for additional information).
[2] | Transactions with related parties are included in the line items above as follows (refer to Footnote 13, Related Party Transactions, for further information):
|  | Years Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Revenues |  | $ | 10,217 |  |  | $ | 11,420 |  |  | $ | 14,934 |
Cost of revenues |  | 30,450 |  |  | 29,265 |  |  | 26,971 |
Convertible redeemable preferred stock dividends |  | (17,600) |  |  | (16,270) |  |  | (15,513) |

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