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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 No definition available. + Details
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- Definition 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 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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