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Financial Statement Components - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accounts Receivable [Line Items] |  |  |
Allowance for doubtful accounts | $ (28) |  | $ (33)
Accounts receivable, net | 20,167 | $ 19,151 | 19,048
Trade accounts receivable |  |  |
Accounts Receivable [Line Items] |  |  |
Trade accounts receivable | 19,378 |  | 17,481
Unbilled trade accounts receivable, net of advance client deposits |  |  |
Accounts Receivable [Line Items] |  |  |
Trade accounts receivable | $ 817 |  | $ 1,600

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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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