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Company and Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Selling and Marketing Expense [Member]        
Significant Accounting Policies [Line Items]        
Advertising costs $ 530,000 $ 173,000 $ 1,484,000 $ 419,000