Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities And Other Liabilities [Abstract]
Accrued salary and payroll related expenses	$ 4,432	$ 4,829
Accrued accounts payable	2,872	3,417
Customer advances	1,638	1,463
Income tax (receivable) payable	(88)	236
Sales and use tax payable	237	434
Other	734	806
Accrued expenses and other current liabilities	$ 9,825	$ 11,185	[1]

[1] Derived from our audited consolidated financial statements as of December 31, 2015.