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Fair Value Measurements (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	$ 149,916	$ 60,958
Corporate notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	31,694	46,098
Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	12,198
Government notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	12,430	6,175
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	9,850	19,963
Level 1 | Corporate notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments		5,103
Level 1 | Government notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments		6,175
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	140,066	40,995
Level 2 | Corporate notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	31,694	40,995
Level 2 | Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	12,198
Level 2 | Government notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	12,430
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	$ 9,850	8,685
Net asset value	$ 1
Money market funds | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	$ 9,850	$ 8,685
Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	83,744
Commercial paper | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 83,744

X

- Definition

Net asset value measure per share.

+ References

No definition available.

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- Definition

Fair value portion 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.

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- Definition

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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