Stockholders' Equity - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Class Of Stock [Line Items]
Preferred stock, shares authorized	5,000,000
Preferred stock, par value | $ / shares	$ 0.0001
Preferred stock, shares outstanding	0
Number of shares issued for conversion	3,700,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	451,000,000
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares issued	44,567,831
Common stock, shares outstanding	44,567,831
Common stock, entitled for voting rights	one vote per share
Number of shares issued for conversion	1,928,417
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	7,713,740
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares outstanding	0
Percentage of outstanding common stock, minimum	25.00%
Number of shares converted	1,928,417
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