CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - FAIR VALUE (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair value hierarchy for financial assets and liabilities
Assets	$ 89,574	$ 144,168
Liabilities	14,825	14,971
Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,489	1,504
Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	11,742	12,002
CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,594	1,465
Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	36,850	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	532	64
Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	52,192	56,383
Level 1
Fair value hierarchy for financial assets and liabilities
Assets	532	64
Level 1 \| Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	532	64
Level 2
Fair value hierarchy for financial assets and liabilities
Assets	89,042	144,104
Level 2 \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	36,850	44,956
Level 2 \| U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets		42,765
Level 2 \| Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	52,192	56,383
Level 3
Fair value hierarchy for financial assets and liabilities
Liabilities	14,825	14,971
Level 3 \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	1,489	1,504
Level 3 \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	11,742	12,002
Level 3 \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 1,594	$ 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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- 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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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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