6. Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Schedule of accounts receivable

The accounts receivable as of December 31, 2019 and 2018 consisted of the following: 

	December 31,			December 31,
	2019			2018
Accounts receivable	$	17,001		$	28,410
Less: Allowance for doubtful accounts		(462	)		(633	)
Accounts receivable, net	$	16,539		$	27,777

Allowance for doubtful accounts rollforward

The movements of allowance for doubtful accounts are as follows:

	2019			2018			2017
Balance as at January 1	$	633		$	1,520		$	1,592
Addition		101			202			1,536
Written off		(45	)		–			(1,526	)
Reversal		(225	)		(1,002	)		(152	)
Foreign currency translation difference		(2	)		(87	)		70
Balance as at December 31	$	462		$	633		$	1,520