CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts receivable (in dollars)	$ 8,743	$ 7,956
Convertible Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible Preferred stock, shares authorized	1,000,000	1,000,000
Convertible Preferred stock, shares outstanding	0	0
Common Stock Class A
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	9,104,916	4,441,635
Common stock, shares outstanding	9,104,916	4,441,635
Common Stock Class B
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	2,861,843	2,861,843
Common stock, shares outstanding	2,861,843	2,861,843
Common Stock Class C
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	2,045,016
Common stock, shares outstanding	2,045,016	2,928,906
Common Stock Class D
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	37,324,737	37,515,801
Common stock, shares outstanding	37,324,737	37,515,801