Consolidated Balance Sheet Components - Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 4,980	$ 5,111
Prepaid income taxes	1,559	585
Interest receivable	758	467
Other	625	1,802
Total prepaid expenses and other current assets	$ 7,922	$ 7,965