Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity, Non-controlling Interest, and Members' Equity - Schedule Of Calculation Of Comprehensive Loss Attributable To Non-controlling Interest Holders (Details)

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Shareholders' Equity, Non-controlling Interest, and Members' Equity - Schedule Of Calculation Of Comprehensive Loss Attributable To Non-controlling Interest Holders (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Noncontrolling Interest [Line Items]        
Fathom OpCo comprehensive loss $ (490,080) $ (3,275) $ (432,674) $ (7,962)
Comprehensive loss attributable to non-controlling interest (556,027)   (561,728)  
Fathom OpCo [Member]        
Noncontrolling Interest [Line Items]        
Fathom OpCo comprehensive loss $ (1,070,703)   $ (1,079,745)  
Non-controlling interest percentage 51.90%   51.90%  
Comprehensive loss attributable to non-controlling interest $ (556,027)   $ (561,728)