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Income Tax - Net Operating Loss and Credit Carryforwards, Uncertain Tax Positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |
Interest and penalties | $ 2.4 | $ 1.9
Unrecognized tax benefits that would impact the effective tax rate | 2.2 | 1.8
Reversal of unrecognized tax benefits in subsequent period | 0.0 | $ 0.0
Meetrics GmbH |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 5.0 |
Domestic |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 20.2 |
Net operating loss carryforwards subject to expiration | 3.2 |
Domestic | Open Slate |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 18.3 |
State |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 40.4 |
Net operating loss carryforwards subject to expiration | 2.7 |
State | Open Slate |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | $ 31.1 |

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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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