Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 1,687	$ 706
Class A common stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	46,122,094	41,714,870
Common stock, shares outstanding	43,322,590	39,041,065
Class B common stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	9,721,627	9,803,933
Common stock, shares outstanding	9,568,249	9,803,933