Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts receivable	$ 887	$ 615
Provision for sales returns	$ 1,651	$ 1,400
Class 1 common stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	233,333,333	250,000,000
Common stock, shares issued	0	16,666,667
Common stock, shares outstanding	0	16,666,667
Class 2 common stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	158,456,087	86,114,558
Common stock, shares outstanding	158,456,087	86,114,558