Annual report pursuant to Section 13 and 15(d)

Income Tax - Net Operating Loss and Credit Carryforwards, Uncertain Tax Positions (Details)

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Income Tax - Net Operating Loss and Credit Carryforwards, Uncertain Tax Positions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Contingency [Line Items]    
Interest and penalties $ 2.7 $ 3.4
Unrecognized tax benefits that would impact the effective tax rate 2.3 $ 3.3
Reversal of unrecognized tax benefits in subsequent period 0.0  
Meetrics GmbH    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 1.5  
Domestic    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 6.1  
Net operating loss carryforwards utilized 4.1  
Domestic | OpenSlate    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 4.0  
Domestic | Scibids    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 4.7  
State    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 8.7  
Net operating loss carryforwards utilized 7.9  
State | OpenSlate    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards $ 1.3