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Schedule I - Condensed Financial Information of Registrant - Notes to Condensed Financial Statements (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 29, 2021 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 18, 2017
Stock split, conversion ratio | 0.333 |  |  |  |
Income tax (benefit) expense |  | $ (3,487) | $ (3,144) | $ 12,053 |
DoubleVerify Inc. |  |  |  |  |
Ownership percentage acquired |  |  |  |  | 100.00%
Parent Company | Reportable Legal Entities |  |  |  |  |
Stock split, conversion ratio | 0.333 |  |  |  |
Income tax (benefit) expense |  | (3,487) | (3,144) | 12,053 |
Distributions from subsidiaries |  | $ 0 | $ 0 | $ 0 |
Parent Company | Reportable Legal Entities | DoubleVerify Inc. |  |  |  |  |
Ownership percentage acquired |  |  |  |  | 100.00%

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