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The Company and Summary of Significant Accounting Policies - Accounts Receivable and Allowance for Doubtful Accounts and Sales Returns (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
The Company and Summary of Significant Accounting Policies |  |
Accounts receivable | $ 24,558,000 | $ 19,031,000
Accrued liabilities | 15,995,000 | 11,681,000
Allowance for Doubtful Accounts |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 217,000 | 34,000
Increase/ (decrease) in allowance for doubtful accounts | 183,000 | (324,000)
Allowance for Sales Returns |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 81,000 | 26,000
Allowance utilized | 82,000 | 26,000
Additional reduction | $ 137,000 | $ 5,000

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