Quarterly report pursuant to Section 13 or 15(d)

Equity (Detail)

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Equity (Detail)
 3 Months Ended
Oct. 21, 2019
$ / shares
shares
Dec. 31, 2019
shares
Sep. 30, 2019
shares
Schedule Of Stockholders Equity [Line Items]      
Conversion of Class B common stock to Class A common stock (in shares)   0  
Class A Common Stock      
Schedule Of Stockholders Equity [Line Items]      
Shares issued, price per share (in dollars per share) | $ / shares $ 14.25    
Conversion of Class B common stock to Class A common stock (in shares)   107,682  
Conversion rate   1  
Common stock, shares outstanding (in shares)   32,705,418 32,597,736
Class B Common Stock      
Schedule Of Stockholders Equity [Line Items]      
Conversion of Class B common stock to Class A common stock (in shares)   107,682  
Common stock, shares outstanding (in shares)   19,076,327 19,184,009
Over-Allotment Option | Class A Common Stock      
Schedule Of Stockholders Equity [Line Items]      
Issuance of stock (in shares) 750,000