Consolidated Balance Sheet Components - Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities And Other Liabilities [Abstract]
Accrued expenses	$ 4,616	$ 4,633
Derivative liability	639	595
Income tax payable	435	323
Short-term deferred rent	461	283
Skyfence holdback liability	0	7,556
Sales Taxes Payable	849	411
Other	683	482
Total accrued and other current liabilities	$ 7,683	$ 14,283