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Marketable Securities (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 190,700
Gross unrealized gains	6
Gross unrealized losses	(522)
Fair value	190,184
Marketable securities
Schedule of Available-for-sale Securities [Line Items]
Fair value	180,731
Money Market Funds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	9,453
Fair value	9,453
Corporate Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	115,148
Gross unrealized gains	6
Gross unrealized losses	(308)
Fair value	114,846
Government Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	66,099
Gross unrealized losses	(214)
Fair value	65,885
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 9,453

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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