Accounts Receivable, net (Details - Accounts receivable) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 25,419	$ 17,306
Less: Allowance for credit losses	(2,820)	(245)	$ (462)	$ (633)
Accounts receivable, net	$ 22,599	$ 17,061