Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Accrued salary and payroll related expenses	$ 5,238	$ 6,017
Accrued accounts payable	3,914	3,709
Customer advances	1,501	1,366
Income tax payable	204	377
Sales and use tax payable	506	263
Deferred tax liabilities	287	0
Deferred rent and other	673	321
Accrued expenses and other current liabilities	$ 12,323	$ 12,053	[1]

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