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Organization and Summary of Significant Accounting Policies - Summary of Changes in Estimated Product Warranty Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement in Standard and Extended Product Warranty    
Balance, beginning of period $ 1,476 $ 898
Utilization of reserve (700) (973)
Warranty expense (benefit) (7) 1,551
Balance, end of period $ 769 $ 1,476