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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, 2018 | Dec. 31, 2017
The Company and Summary of Significant Accounting Policies |  |
Accounts receivable | $ 19,586,000 | $ 22,778,000
Accrued liabilities | 15,371,000 | 11,149,000
Adjustment | ASU 2014-09 |  |
The Company and Summary of Significant Accounting Policies |  |
Accounts receivable | 169,000 |
Accrued liabilities | 169,000 |
Allowance for Doubtful Accounts |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 358,000 | 358,000
Increase/ (decrease) in allowance for doubtful accounts | 0 | 295,000
Bad debt recovery |  | 138,000
Bad debt written off |  | 157,000
Allowance for Sales Returns |  |
The Company and Summary of Significant Accounting Policies |  |
Valuation allowance balance | 47,000 | 169,000
Allowance utilized | 47,000 | 119,000
Additional reduction | $ 75,000 | $ 72,000

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