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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, 2021 | Dec. 31, 2020
The Company and Summary of Significant Accounting Policies |  |
Accounts receivable | $ 34,839,000 | $ 24,558,000
Accrued liabilities | 17,057,000 | 15,995,000
Allowance for Doubtful Accounts |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 130,000 | 217,000
Increase/ (decrease) in allowance for doubtful accounts | 87,000 | 183,000
Allowance for Sales Returns |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 48,000 | 81,000
Allowance utilized | 48,000 | 82,000
Additional reduction | $ 15,000 | $ 137,000

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