ACCOUNTS RECEIVABLE

12 Months Ended

Dec. 31, 2011

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE

4.ACCOUNTS RECEIVABLE

Accounts receivable consists of the following:

	December 31,
	2010			2011
Accounts receivable	$	8,174		$	16,809
Allowance for doubtful accounts	(14		)	(68		)
Accounts receivable, net	$	8,160		$	16,741

Movement of allowance for doubtful accounts is as follows:

	December 31,
	2009			2010			2011
Balance at beginning of year	$	38		$	51		$	14
Charge to (reversal of) expenses	27			(32		)	51
Write off during the year	(16		)	(4		)	—
Exchange rate differences	2			(1		)	3
Balance at end of year	$	51		$	14		$	68