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Balance Sheet Components - Schedule of Gross Accounts Receivable Balance Concentrations by Major Category (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Accounts Notes And Loans Receivable [Line Items] |  |
Gross accounts receivable | $ 41,394 | $ 34,710
Rental |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Gross accounts receivable | 5,451 | 6,236
Business To Business And Other Receivables |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Gross accounts receivable | $ 35,943 | $ 28,474

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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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