Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2014

Deferred Revenue [Abstract]

Schedule of Deferred Revenue

	December 31,
	2013		2014
Deferred revenue - current
Customers advance	$	33,979	$	52,548
Deferred income		12,653		20,342
Total deferred revenue - current	$	46,632	$	72,890
Deferred revenue - noncurrent
Customers advance	$	1,612	$	1,606
Deferred income		1,932		675
Total deferred revenue - noncurrent	$	3,544	$	2,281