ACCOUNTS RECEIVABLE, NET (Tables)

12 Months Ended

Dec. 31, 2020

Accounts Receivable, Net [Abstract]

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable and allowance for credit losses consist of the following:

	December 31,
	2019 $			2020 $
Accounts receivable		191,118			370,977
Allowance for credit losses		(4,083	)		(7,978	)
		187,035			362,999

Analysis of Allowances for Doubtful Accounts

An analysis of the allowance for credit losses is as follows:

	_$
Balance at January 1, 2018		1,830
Charged to expenses		2,205
Reversal		(47	)
Write-off of accounts receivable		(1,588	)
Balance at December 31, 2018		2,400
Charged to expenses		4,687
Reversal		(1,431	)
Write-off of accounts receivable		(1,537	)
Exchange differences		(36	)
Balance at December 31, 2019		4,083
Charged to expenses		5,155
Write-off of accounts receivable		(1,415	)
Exchange differences		155
Balance at December 31, 2020		7,978