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Segment Information - Schedule of Financial Information that is Presented to the CODM (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Revenues | [1] | $ 356,047 | $ 371,343 | $ 376,423
Cost of revenues | [1],[2],[3] | 208,708 | 205,580 | 205,294
Stock-based compensation |  | 3,191 | 4,535 | 8,178
Non-recurring expenses (income) |  | (651) | (42) | (9,785)
Interest expense, net |  | 1,883 | 1,445 | 915
Taxes |  | 924 | 1,533 | 1,724
Net loss |  | (60,248) | (79,361) | (66,561)
Content & Ad Measurement |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 301,124 | 309,904 | 307,479
Syndicated Audience |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 260,654 | 276,101 | 282,238
Cross Platform |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 40,470 | 33,803 | 25,241
Research & Insight Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 54,923 | 61,439 | 68,944
Reportable Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 356,047 | 371,343 | 376,423
Cost of revenues |  | 136,831 | 137,722 | 137,163
Compensation |  | 125,946 | 133,934 | 146,313
Professional fees |  | 20,693 | 22,095 | 22,042
Facilities & office expense |  | 10,263 | 11,034 | 12,915
Software licenses, maintenance and systems |  | 12,498 | 12,576 | 12,770
Travel & entertainment |  | 2,075 | 1,940 | 1,536
Other operating expenses |  | 5,379 | 8,011 | 6,216
Total operating expenses |  | 176,854 | 189,590 | 201,792
Depreciation & amortization |  | 28,795 | 26,920 | 46,288
Stock-based compensation |  | 3,191 | 4,535 | 8,178
Non-recurring expenses (income) |  | 846 | 1,740 | (5,646)
Restructuring & transformation |  | 2,574 | 7,517 | 6,270
Impairment |  | 64,397 | 79,702 | 46,300
Interest expense, net |  | 1,883 | 1,445 | 915
Taxes |  | 924 | 1,533 | 1,724
Net loss |  | (60,248) | (79,361) | (66,561)
Reportable Segment | Content & Ad Measurement |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 301,124 | 309,904 | 307,479
Reportable Segment | Syndicated Audience |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 260,654 | 276,101 | 282,238
Reportable Segment | Cross Platform |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 40,470 | 33,803 | 25,241
Reportable Segment | Research & Insight Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | $ 54,923 | $ 61,439 | $ 68,944
[1] | 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) |
[2] | Excludes amortization of intangible assets, which is presented separately in the Consolidated Statements of Operations and Comprehensive Loss.
[3] | Stock-based compensation expense is included in the line items above as follows:
|  | Years Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Cost of revenues |  | $ | 221 |  |  | $ | 533 |  |  | $ | 1,144 |
Selling and marketing |  | 126 |  |  | 380 |  |  | 1,021 |
Research and development |  | 161 |  |  | 411 |  |  | 827 |
General and administrative |  | 2,683 |  |  | 3,211 |  |  | 5,186 |
Total stock-based compensation expense |  | $ | 3,191 |  |  | $ | 4,535 |  |  | $ | 8,178 |

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