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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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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.

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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.

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