Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes [Abstract]

Components of Income Tax Expense

	For the year ended December 31,
	2010		2011		2012
Current income tax expense	$	403	$	10,724	$	12,062
Deferred income tax expense (benefit)		60		150		(683	)
Total income tax expense	$	463	$	10,874	$	11,379

Components of Deferred Tax Assets and Liabilities

	December 31,
	2011			2012
Current deferred tax assets:
Accrued payroll	$	797		$	1,950
Provision of allowance for doubtful accounts		15			125
Deferred revenue-current		-			196
Other assets		52			-
Less: Valuation allowance		(6	)		(140	)
Current deferred tax assets, net		858			2,131
Noncurrent deferred tax assets:
Deferred revenue-noncurrent		457			440
Acquired intangible assets		57			175
Advertising and promotion expenses		23			-
Subsidy income		-			130
Net operating loss carry forwards		1,137			975
Less: Valuation allowance		(1,160	)		(975	)
Noncurrent deferred tax assets, net		514			745
Noncurrent deferred tax liabilities:
Acquired intangible assets		507			425
Subsidy income		-			365
Noncurrent deferred tax liabilities	$	507		$	790

Effective Income Tax Rate Reconciliation

	For the year ended December 31,
	2010			2011			2012
Income before income tax expense	$	9,011		$	25,855			62,695
PRC statutory income tax rate		25	%		25	%		25	%
Income tax expense at the statutory income tax rate		2,253			6,464			15,674
Permanent differences		75			116			870
Effect of different income tax calculation
method required by tax bureau		(2,416	)		(84	)		67
Effect of different income tax rates
in other jurisdictions		1,093			10,585			12,192
Effect of income tax holiday
and preferential tax rates		(717	)		(7,036	)		(17,844	)
Changes in valuation allowance		175			829			420
Income tax expense	$	463		$	10,874		$	11,379