CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 9,787	$ 1,342
Recurring | Level 1
Fair value hierarchy for financial assets and liabilities
Assets	36,232	17,307
Recurring | Level 1 | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets		6,039
Recurring | Level 1 | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	36,232	11,268
Recurring | Level 2
Fair value hierarchy for financial assets and liabilities
Assets	21,080	48,816
Recurring | Level 2 | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	17,874	29,556
Recurring | Level 2 | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets	3,206	17,251
Recurring | Level 2 | U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets		2,009
Recurring | Level 3
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration		1,342
Liabilities	9,787	1,342
Recurring | Level 3 | Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities	1,539
Recurring | Level 3 | Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities	8,248
Recurring | Total
Fair value hierarchy for financial assets and liabilities
Assets	57,312	66,123
Liabilities, contingent consideration		1,342
Liabilities	9,787	1,342
Recurring | Total | Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities	1,539
Recurring | Total | Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities	8,248
Recurring | Total | Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets	17,874	35,595
Recurring | Total | Government agency debt securities
Fair value hierarchy for financial assets and liabilities
Assets	3,206	17,251
Recurring | Total | U.S. Treasury securities
Fair value hierarchy for financial assets and liabilities
Assets		2,009
Recurring | Total | Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	$ 36,232	$ 11,268