Common Stock and Non-Voting Common Stock - Additional Information (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Vote $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Class Of Stock [Line Items]
Common stock, shares authorized	1,000,000,000	1,000,000,000
Preferred stock, shares authorized	200,000,000	200,000,000
Common stock, par value | $ / shares	$ 0.01	$ 0.01
Preferred stock, par value | $ / shares	$ 0.01	$ 0.01
Common stock, voting rights	Each share of common stock (excluding non-voting common stock) is entitled to one vote
Number of common stock voting rights held | Vote	1
Common stock, dividends declared | $	$ 0	$ 0
Common Stock Including Nonvoting Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	1,006,431,208	1,006,431,208
Non-voting Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	6,431,208	6,431,208
Common stock, par value | $ / shares	$ 0.01	$ 0.01