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The Company and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Accounts receivable | $ 22,778,000 | $ 14,453,000
Allowance for Doubtful Accounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Increase (Decrease) in allowance for doubtful accounts | (295,000) | 92,000
Bad debt recovery | 138,000 |
Bad debt written off | 157,000 |
Valuation allowance balance | 358,000 | 653,000
Allowance for Sales Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Allowance deductions | 119,000 | 360,000
Additional allowance for sales return | 72,000 | 296,000
Valuation allowance balance | $ 169,000 | $ 360,000

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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