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Contingent Liabilities (Details) carrier in Thousands, $ in Millions |  |  |  | 1 Months Ended | 78 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 12, 2020 USD ($) carrier plaintiff | Feb. 27, 2020 USD ($) | May 25, 2017 USD ($) | Feb. 29, 2020 USD ($) | May 31, 2016 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 01, 2019 USD ($)
YP Acquisition |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Value of escrowed stock |  |  |  |  |  | $ 25.9 | $ 29.8 |
Walker v. Directory Distributing Associates, Inc. et al. | Judicial Ruling |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 2,500 |  |  |  |  |  |  |
Maximum exposure |  |  |  |  |  |  |  | $ 1.5
Number of former carriers | carrier | 46 |  |  |  |  |  |  |
Contingent liability | $ 0.8 |  |  |  |  |  |  |
Krawczyk V. Directory Distributing Associates, Inc. Et Al | Judicial Ruling |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Maximum exposure |  |  |  |  |  |  |  | $ 1.5
Number of former carriers | carrier | 46 |  |  |  |  |  |  |
Contingent liability | $ 0.8 |  |  |  |  |  |  |
New York State Division of Taxation and Finance |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Tax and interest due |  |  |  |  | $ 8.7 |  |  |
Unpaid tax and interest balance |  |  |  |  |  | 3.5 |  |
Sales and excise tax payable |  |  |  |  |  | 1.9 |  |
New York State Division of Taxation and Finance | First Case | December 1, 2009 Through Tax Year May 31, 2012 |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Tax and interest due |  |  | $ 3.2 |  |  |  |  |
Payment of tax and interest |  |  |  | $ 5.1 |  |  |  |
New York State Division of Taxation and Finance | Second Case | June 1, 2012 Through Tax Year May 31, 2016 |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Tax and interest due |  | $ 3.3 |  |  |  |  |  |
IRS | Section 199 Tax Case |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve in connection with disallowance |  |  |  |  |  | 33.7 | 46.0 |
Amount to be paid before allowance of tax credit |  |  |  |  |  | 8.0 |  |
IRS | Research and Development Tax Case |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve in connection with disallowance |  |  |  |  |  | 0.7 | $ 7.1 |
Texas Comptroller |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Sales and excise tax payable |  |  |  |  |  | $ 2.4 |  |

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