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Organization and Summary of Significant Accounting Policies - Summary of Changes in Estimated Product Warranty Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Movement in Standard and Extended Product Warranty    
Balance, beginning of period $ 769 $ 1,476
Utilization of reserve (582) (539)
Warranty expense (benefit) 1,176 (192)
Balance, end of period $ 1,363 $ 745