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Balance Sheet Details - Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 1,091 $ 608 $ 863 $ 699
Accrual for warranties 255 458 912 1,195
Warranty costs incurred (239) (325) (668) (1,153)
Ending balance $ 1,107 $ 741 $ 1,107 $ 741