CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	$ 12,195	$ 11,264
Recurring | Level 1
Fair value hierarchy for financial assets and liabilities
Assets	181,254	217,946
Recurring | Level 1 | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	181,254	217,946
Recurring | Level 2
Fair value hierarchy for financial assets and liabilities
Assets	12,554	31,343
Recurring | Level 2 | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	12,554	16,526
Recurring | Level 2 | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets		14,817
Recurring | Level 3
Fair value hierarchy for financial assets and liabilities
Unfavorable contract assumed	3,835	3,540
Liabilities	16,030	14,804
Recurring | Level 3 | Zipsor
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	1,708	1,638
Recurring | Level 3 | Lazanda
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	9,391	8,616
Recurring | Level 3 | CAMBIA
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	1,096	1,010
Recurring | Total
Fair value hierarchy for financial assets and liabilities
Assets	193,808	249,289
Unfavorable contract assumed	3,835	3,540
Liabilities	16,030	14,804
Recurring | Total | Zipsor
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	1,708	1,638
Recurring | Total | Lazanda
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	9,391	8,616
Recurring | Total | CAMBIA
Fair value hierarchy for financial assets and liabilities
Contingent consideration liability	1,096	1,010
Recurring | Total | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	12,554	16,526
Recurring | Total | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets		14,817
Recurring | Total | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	$ 181,254	$ 217,946