CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - FAIR VALUE (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair value hierarchy for financial assets and liabilities
Assets	$ 24,782	$ 89,574
Liabilities	8,611	14,825
Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	797	1,489
Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	7,058	11,742
CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	756	1,594
Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	6,702	36,850
Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	85	532
Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	17,995	52,192
Level 1
Fair value hierarchy for financial assets and liabilities
Assets	85	532
Level 1 \| Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	85	532
Level 2
Fair value hierarchy for financial assets and liabilities
Assets	24,697	89,042
Level 2 \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	6,702	36,850
Level 2 \| Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	17,995	52,192
Level 3
Fair value hierarchy for financial assets and liabilities
Liabilities	8,611	14,825
Level 3 \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	797	1,489
Level 3 \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	7,058	11,742
Level 3 \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 756	$ 1,594

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=66048111&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 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: 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 3: 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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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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