Goodwill

12 Months Ended

Dec. 31, 2014

Goodwill [Abstract]

Goodwill

10. GOODWILL

	2013			2014
Beginning balance	$	4,628		$	29,509
Goodwill acquired in acquisitions of business		24,992			316,492
Exchange rate differences		(111	)		(1,371	)
Ending balance	$	29,509		$	344,630

The Group assessed the qualitative factors to determine it is not more likely than not that the fair value of each reporting unit is less than its respective carrying amount. There was no impairment of goodwill during the years ended December 31, 2012, 2013 and 2014.