Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019	Jun. 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)	188,460,784	188,289,680	188,144,137
Common stock, shares outstanding (in shares)	188,460,784	188,289,680	188,144,137
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)	231,353,704	229,027,730	228,652,955
Common stock, shares outstanding (in shares)	231,353,704	229,027,730	228,652,955