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Balance Sheet Components Warranty Accrual Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 8,551 $ 5,929
Charged to cost of net revenues 6,000 5,728
Actual warranty expenditures (4,052) (4,371)
Balance at end of period $ 10,499 $ 7,286