Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2012

Accounts Receivable [Abstract]

Schedule of Accounts Receivable

	December 31,
	2011			2012
Accounts receivable	$	16,809		$	23,804
Allowance for doubtful accounts		(68	)		(213	)
Accounts receivable, net	$	16,741		$	23,591

Movement of allowance for doubtful accounts

	2010			2011		2012
Balance at beginning of year	$	51		$	14	$	68
(Reversal of) charge to expenses		(32	)		51		154
Write offs during the year		(4	)		-		(10	)
Exchange rate differences		(1	)		3		1
Balance at end of year	$	14		$	68	$	213