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Balance Sheet Components - Warranty Accrual Activity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 5,929 $ 3,841
Charged to cost of revenues 15,059 7,195
Actual warranty expenditures (12,437) (5,107)
Balance at end of period $ 8,551 $ 5,929