XML 57 R45.htm IDEA: XBRL DOCUMENT v3.21.2
Redeemable Noncontrolling Interest - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Noncontrolling Interest [Line Items]    
Redemption amount of noncontrolling interest $ 44.6 $ 83.9
Class A Common Stock [Member]    
Noncontrolling Interest [Line Items]    
Number of days used to determine exchange value based on weighted average price of Class A common stock 20 days  
Class A Common Stock [Member] | Exchange of Redeemable Non controlling Interest To Class A Common Stock [Member]    
Noncontrolling Interest [Line Items]    
Stock conversion ratio 1.00  
vTv Therapeutics LLC [Member]    
Noncontrolling Interest [Line Items]    
Noncontrolling interest ownership percentage 25.80%