Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Taxes [Abstract]

Components of Income Tax Expense

	For the year ended December 31,
	2012			2013		2014
Current income tax expense	$	12,062		$	22,382	$	69,693
Deferred income tax (benefit) expense		(683	)		1,041		(18,268	)
Total income tax expense	$	11,379		$	23,423	$	51,425

Components of Deferred Tax Assets and Liabilities

	December 31,
	2013			2014
Current deferred tax assets
Accrued payroll	$	2,889		$	5,141
Provision of allowance for doubtful accounts		92			478
Deferred revenue-current		306			660
Less: Valuation allowance		(158	)		(1,435	)
Current deferred tax assets, net		3,129			4,844
Noncurrent deferred tax assets
Deferred revenue-noncurrent		383			339
Intangible assets		266			953
Fixed assets		66			100
Subsidy income		231			270
Net operating loss carry forwards		4,592			9,193
Promotion fee		-			13,894
Unrealized loss on available-for-sale investments		-			2,462
Less: Valuation allowance		(4,592	)		(10,846	)
Noncurrent deferred tax assets, net		946			16,365
Noncurrent deferred tax liabilities
Acquired intangible assets		2,676			8,159
Unrealized gain on available-for-sale investments		-			357
Noncurrent deferred tax liabilities	$	2,676		$	8,516

Effective Income Tax Rate Reconciliation

	For the year ended December 31,
	2012			2013			2014
Income before income tax expense	$	62,695		$	124,019		$	286,494
PRC statutory income tax rate		25	%		25	%		25	%
Income tax expense at the statutory income tax rate		15,674			31,005			71,624
Permanent differences		870			1,663			5,506
Effect of different income tax calculation method required by tax bureau		67			48			(5	)
Effect of tax exempt status in Cayman Islands and other jurisdictions		12,217			30,241			24,701
Effect of different income tax rate in Hong Kong		(25	)		168			273
Effect of income tax holiday and preferential tax rates		(17,844	)		(43,460	)		(58,529	)
Changes in valuation allowance		420			3,758			7,855
Income tax expense	$	11,379		$	23,423		$	51,425