Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Class A Common Stock
Commons stock, par value (USD per share)	$ 0.0003	$ 0.0003	$ 0.0003
Common stock, authorized (in shares)	400,000,000	400,000,000	400,000,000
Common stock, shares issued (in shares)	188,533,987	188,289,680	188,201,145
Common stock, shares outstanding (in shares)	188,533,987	188,289,680	188,201,145
Class B Convertible Common Stock
Commons stock, par value (USD per share)	$ 0.0003	$ 0.0003	$ 0.0003
Common stock, authorized (in shares)	34,450,000	34,450,000	34,450,000
Common stock, shares issued (in shares)	34,450,000	34,450,000	34,450,000
Common stock, shares outstanding (in shares)	34,450,000	34,450,000	34,450,000
Class C Common Stock
Commons stock, par value (USD per share)	$ 0.0003	$ 0.0003	$ 0.0003
Common stock, authorized (in shares)	400,000,000	400,000,000	400,000,000
Common stock, shares issued (in shares)	231,684,883	229,027,730	228,881,215
Common stock, shares outstanding (in shares)	231,684,883	229,027,730	228,881,215