Consolidated Balance Sheet Components - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 5,111	$ 3,263
Prepaid income taxes	585	45
Interest receivable	467	230
Other	1,802	389
Total prepaid expenses and other current assets	$ 7,965	$ 3,927