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Financial Statements Details - Warranty Accrual (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Warranty [Roll Forward]    
Warranty accrual, beginning of period $ 5,362 $ 7,415
Liabilities accrued for warranties issued during the period 2,082 3,813
Warranty costs incurred during the period (2,370) (3,046)
Warranty accrual, end of period $ 5,074 $ 8,182