v3.22.2.2
Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 01, 2021
Apr. 30, 2021
Feb. 04, 2021
Feb. 28, 2022
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Apr. 29, 2021
Business Acquisition [Line Items]                  
Share Price (in USD per share)   $ 40.05             $ 49.21
Goodwill         $ 969,873 $ 969,873   $ 978,217  
SpotX, Inc | SpringServe                  
Business Acquisition [Line Items]                  
Prior investment             $ 2,100    
Fair value of prior investment $ 9,500 $ 7,500              
SpotX, Inc                  
Business Acquisition [Line Items]                  
Cash Consideration   $ 640,000 $ 560,000            
Issued in merger (in shares)   12,374,315 14,000,000            
Cash consideration, elected increase, percent   20.00%              
Cash consideration, elected increase, amount   $ 80,000              
Shares issued, elected decrease, percent   20.00%              
Shares issued, elected decrease, value   $ 80,000              
Purchase price prior to working capital adjustments   1,100,000              
Working capital adjustment   65,152              
Purchase price   1,200,743 $ 1,200,000            
Stock Consideration (Fair Value of Shares of Magnite common stock)   495,591              
Deferred tax asset valuation allowance decrease           56,200      
Intangible assets acquired   429,600              
Deferred tax liability, net   103,039              
Goodwill   $ 782,719              
SpotX, Inc | Non-compete agreements                  
Business Acquisition [Line Items]                  
Estimated Useful Life   1 year              
Intangible assets acquired   $ 1,500              
SpotX, Inc | Technology                  
Business Acquisition [Line Items]                  
Estimated Useful Life   5 years              
Intangible assets acquired   $ 280,400              
SpotX, Inc | Customer relationships                  
Business Acquisition [Line Items]                  
Intangible assets acquired   $ 130,300              
SpringServe                  
Business Acquisition [Line Items]                  
Cash Consideration 31,136                
Purchase price held back to cover possible indemnification claims 1,400                
Intangible assets acquired 23,400                
Deferred tax liability, net 6,154                
Goodwill $ 24,156                
SpringServe | Non-compete agreements                  
Business Acquisition [Line Items]                  
Estimated Useful Life 2 years                
Intangible assets acquired $ 500                
SpringServe | Technology                  
Business Acquisition [Line Items]                  
Estimated Useful Life 5 years                
Intangible assets acquired $ 15,500                
SpringServe | Customer relationships                  
Business Acquisition [Line Items]                  
Estimated Useful Life 2 years                
Intangible assets acquired $ 5,700                
Nth Party, Ltd.                  
Business Acquisition [Line Items]                  
Purchase price         9,000        
Deferred tax liability, net         1,300 1,300      
Goodwill         $ 4,800 $ 4,800      
Nth Party, Ltd. | Non-compete agreements                  
Business Acquisition [Line Items]                  
Estimated Useful Life         2 years        
Intangible assets acquired         $ 200        
Nth Party, Ltd. | Technology                  
Business Acquisition [Line Items]                  
Estimated Useful Life         5 years        
Intangible assets acquired         $ 5,400        
Carbon (AI) Limited and Mode Technologies, Inc.                  
Business Acquisition [Line Items]                  
Purchase price       $ 23,100          
Business combination, contingent consideration, liability       2,300          
Goodwill       $ 8,500          
Carbon (AI) Limited and Mode Technologies, Inc. | Non-compete agreements                  
Business Acquisition [Line Items]                  
Estimated Useful Life       2 years          
Intangible assets acquired       $ 200          
Carbon (AI) Limited and Mode Technologies, Inc. | Technology                  
Business Acquisition [Line Items]                  
Estimated Useful Life       5 years          
Intangible assets acquired       $ 14,200          
Carbon (AI) Limited and Mode Technologies, Inc. | Customer relationships                  
Business Acquisition [Line Items]                  
Estimated Useful Life       6 months          
Intangible assets acquired       $ 200