Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Accrued salary and payroll related expenses	$ 5,773	$ 6,017
Accrued accounts payable	4,185	3,709
Customer advances	1,399	1,366
Income tax payable	660	377
Sales and use tax payable	368	263
Deferred tax liabilities	223	0
Deferred rent and other	414	321
Accrued expenses and other current liabilities	$ 13,022	$ 12,053	[1]

[1] Derived from our audited consolidated financial statements as of December 31, 2014.