Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Preferred Stock, shares authorized 10,000,000 10,000,000  
Preferred Stock, par value $ 0.001 $ 0.001  
Class A Common Stock [Member]      
Class of Stock [Line Items]      
Common Stock, shares authorized 500,000,000 500,000,000  
Common Stock, par value $ 0.001 $ 0.001  
Class B Common Stock [Member]      
Class of Stock [Line Items]      
Common Stock, shares authorized 75,000,000 75,000,000  
Common Stock, par value $ 0.001 $ 0.001  
Certain Class B stockholders converted into Class A 1,575,509 561,876 0