Accounts Receivable

12 Months Ended

Dec. 31, 2015

Accounts Receivable [Abstract]

Accounts Receivable

4. ACCOUNTS RECEIVABLE

Accounts receivable consists of the following:

	December 31,
	2014			2015
Accounts receivable		156,697			264,597
Allowance for doubtful accounts		(2,410	)		(3,478	)
Accounts receivable, net	$	154,287		$	261,119

Movement of allowance for doubtful accounts is as follows:

	December 31,
	2013			2014			2015
Balance at beginning of year	$	213		$	145		$	2,410
Addition in connection with business acquisition		-			2,020			-
Charge to expense		157			349			1,280
Write offs during the year		(229	)		(74	)		(106	)
Exchange rate differences		4			(30	)		(106	)
Balance at end of year	$	145		$	2,410		$	3,478