CONSOLIDATED AND COMBINED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts receivable allowance	$ 16,603	$ 9,263
Class A Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	2,000,000,000	2,000,000,000
Common stock issued (shares)	80,515,000	62,818,000
Common stock outstanding (shares)	80,515,000	62,818,000
Class B Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	1,500,000,000	1,500,000,000
Common stock issued (shares)	421,118,000	415,186,000
Common stock outstanding (shares)	421,118,000	415,186,000
Class C Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	1,500,000,000	1,500,000,000
Common stock issued (shares)	0	0
Common stock outstanding (shares)	0	0