CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 679	$ 866
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, share authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	39,781,596	38,043,444
Common stock, shares outstanding	39,781,596	38,043,444
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, share authorized	500,000,000	500,000,000
Common stock, shares issued	8,349,610	8,595,596
Common stock, shares outstanding	8,349,610	8,595,596