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Accounts Receivable

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2021

Receivables [Abstract]

ACCOUNTS RECEIVABLE

NOTE 3. ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following:

		December 31, 2021				March 31, 2022
Accounts receivable		$	93,722			$	85,324
Allowance for credit losses			(5,005	)			(5,354	)
Accounts receivable, net		$	88,717			$	79,970

Movement of allowance for credit losses was as follows:

		Three Months Ended March 31,
		2021				2022
Balance at beginning of the period		$	5,047			$	5,005
Cumulative-effect adjustment upon adoption of ASU2016-13, Financial instruments – Credit losses (Topic 326)			—				866
Reversal of expenses			(514	)			(545	)
Write off			(103	)			—
Exchange difference			(14	)			28
Balance at end of the period		$	4,416			$	5,354

4. ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following:

		December 31, 2020				December 31, 2021
Accounts receivable		$	81,345			$	93,722
Allowance for doubtful accounts			(5,047	)			(5,005	)
Accounts receivable, net		$	76,298			$	88,717

Movement of allowance for doubtful accounts was as follows:

		Year Ended December 31,
		2019				2020				2021
Balance at beginning of the period		$	10,111			$	5,537			$	5,047
(Reserve)/Charge to expenses			(4,250	)			(240	)			721
Write off			(233	)			(493	)			(849	)
Exchange difference			(91	)			243				86
Balance at end of the period		$	5,537			$	5,047			$	5,005