Stockholders' Equity - Additional Information (Details) - $ / shares		9 Months Ended
	May 10, 2018	Sep. 30, 2018
Class Of Stock [Line Items]
Preferred stock, shares authorized		5,000,000
Preferred stock, par value		$ 0.0001
Preferred stock, shares outstanding		0
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized		451,000,000
Common stock, par value		$ 0.0001
Common stock, shares issued		45,081,034
Common stock, shares outstanding		45,081,034
Common stock, entitled for voting rights		one vote per share
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized		7,713,740
Common stock, par value		$ 0.0001
Common stock, shares outstanding		0
Percentage of outstanding common stock, minimum	25.00%
Number of Class B common stock converted to Class A common stock as a result of ceasing to represent minimum threshold	9,195,917
Treasury stock retired		36,286,260
Number of shares authorized prior to conversion		44,000,000