Income Taxes - Summary of Components of Deferred Tax Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Tax credit carry forward	$ 5,164	$ 4,442
Depreciation and amortization	3,777	4,371
Share-based compensation	8,099	5,595
Accrued employee costs and other expenses	3,079	2,715
Net operating loss carry forwards	3,746	9,889
Unrealized exchange loss	1,136	859
Deferred rent	1,292	1,268
Others	62	670
Deferred tax assets	26,355	29,809
Valuation allowance	(595)	(729)
Deferred tax assets	25,760	29,080
Deferred tax liabilities:
Unrealized exchange gain	848	667
Intangible assets	11,163	11,973
Deferred tax liabilities	12,011	12,640
Net deferred tax assets	$ 13,749	$ 16,440