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Marketable Securities and Fair Value Measurements - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, All Other Investments [Abstract]
One year or less	$ 98,460	$ 272,031
One year through two years	9,112	39,948
Marketable Securities	$ 107,572	$ 311,979

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Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
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Amount of investment in marketable security, classified as current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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Amount of investment in marketable security, classified as noncurrent.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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