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Company and Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Selling and Marketing Expense [Member]        
Significant Accounting Policies [Line Items]        
Advertising costs $ 512,000 $ 78,000 $ 954,000 $ 246,000