MARKETABLE SECURITIES - FAIR VALUE (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair value hierarchy for financial assets and liabilities
Assets	$ 144,168	$ 543,950
Unfavorable contract assumed		3,343
Liabilities	14,971	17,595
Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,504	1,800
Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	12,002	11,209
CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,465	1,243
Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	44,956	110,190
U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets	42,765
Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	64	179,923
Commercial Paper
Fair value hierarchy for financial assets and liabilities
Assets	56,383	253,837
Level 1
Fair value hierarchy for financial assets and liabilities
Assets	87,785	290,113
Level 1 \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	44,956	110,190
Level 1 \| U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets	42,765
Level 1 \| Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	64	179,923
Level 2
Fair value hierarchy for financial assets and liabilities
Assets	56,383	253,837
Level 2 \| Commercial Paper
Fair value hierarchy for financial assets and liabilities
Assets	56,383	253,837
Level 3
Fair value hierarchy for financial assets and liabilities
Unfavorable contract assumed		3,343
Liabilities	14,971	17,595
Level 3 \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,504	1,800
Level 3 \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	12,002	11,209
Level 3 \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 1,465	$ 1,243

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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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+ References

No definition available.

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- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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No definition available.

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