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Financial Statement Components - Schedule of Cash and Cash Equivalents (Details) $ in Thousands	Jun. 30, 2018 USD ($) lender	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 166,162	$ 68,947	$ 57,149	$ 58,122
Revolving Credit Facility
Cash and Cash Equivalents [Line Items]
Unrestricted cash required to be deposited with lenders	$ 25,000
Number of lenders where compensating balance deposited | lender	2
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 54,242	48,855
Commercial paper
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	500	0
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	75,765	20,092
Certificates of deposit
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	498	0
U.S. treasury
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 35,157	$ 0

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- Definition

Compensating Balance Amount Deposited, Number Of Lenders

+ References

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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- Definition

The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

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