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Stockholders' Equity - Weighted-Average Grant Date Fair Value of Stock Options and Related Assumptions (Parenthetical) (Detail) - $ / shares
 3 Months Ended 9 Months Ended
Aug. 04, 2021
Sep. 30, 2021
Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average estimated fair value of stock options granted [1]   $ 7.21 $ 7.21
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Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average estimated fair value of stock options granted $ 5.10    
[1]

Of the total the weighted-average estimated fair value of the Zynga Replacement Stock options, $5.10 was allocated to the post-combination value.