CASH, CASH EQUIVALENTS, SHORT-TERM INVESTMENTS AND MARKETABLE SECURITIES, LONG-TERM - FAIR VALUE (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair value hierarchy for financial assets and liabilities
Assets	$ 44,363	$ 144,168
Liabilities	14,898	14,971
Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,241	1,504
Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	12,156	12,002
CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,501	1,465
Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	26,944	44,956
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	33	64
Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	17,386	56,383
Level 1
Fair value hierarchy for financial assets and liabilities
Assets	26,977	87,785
Level 1 \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	26,944	44,956
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	33	64
Level 2
Fair value hierarchy for financial assets and liabilities
Assets	17,386	56,383
Level 2 \| Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	17,386	56,383
Level 3
Fair value hierarchy for financial assets and liabilities
Liabilities	14,898	14,971
Level 3 \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,241	1,504
Level 3 \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	12,156	12,002
Level 3 \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 1,501	$ 1,465

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

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

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