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Balance Sheet Components - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash And Cash Equivalents [Abstract]        
Cash $ 92,620 $ 75,685    
Money market funds 105,663 77,639    
Total cash and cash equivalents $ 198,283 $ 153,324 $ 200,184 $ 165,455