Available-for-Sale Securities and Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	$ 202,679	$ 102,587
Total	$ 270,520	171,713
Maturity period for marketable securities
Maximum contractual maturity period	2 years
Weighted average contractual maturity period	9 months
Fair value transfers
Fair value of assets transferred from Level 1 to Level 2	$ 0
Fair value of assets transferred from Level 2 to Level 1	0
Fair value of liabilities transferred from Level1 to Level2	0
Fair value of liabilities transferred from Level 2 to Level 1	0
Level 1
Marketable securities
Money market funds	67,841	69,126
U.S. government securities \| Level 1
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	42,125	47,043
U.S. government agencies securities \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	73,957	31,465
Corporate notes \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	58,971	19,089
Commercial paper \| Level 2
Marketable securities
Marketable securities (including commercial paper classified as cash equivalents)	$ 27,626	$ 4,990

Fair value portion of marketable securities, money market funds and restricted cash.

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Represents the maximum maturity period for marketable securities.

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Represents the weighted average maturity period for marketable securities.

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Fair value portion of money market funds.

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- 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=65884222&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 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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