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Balance Sheet Components - Schedule of Net Accounts Receivable Balance Concentrations by Major Category (Parenthetical) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) Customer
Accounts Notes And Loans Receivable [Line Items] |  |
Accounts receivable, gross | $ 41,394,000 | $ 34,710,000
Customer Concentration Risk | Business To Business Receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Number of customers | Customer | 1 | 1
Accounts receivable, gross | $ 10,763,000 | $ 10,394,000
Credit insurance policy, deductible amount | $ 400,000 |
Credit insurance policy, retention percentage | 10.00% |
Customer Concentration Risk | Business To Business Receivables | Maximum |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Credit insurance policy, coverage limit | $ 18,000,000 | $ 12,000,000

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- Definition Credit insurance policy coverage limit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Credit insurance policy, deductible amount. + References No definition available. + Details
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- Definition Credit insurance policy retention percentage. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of customers. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amounts 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | debit
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- Details
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- Details
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