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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - FAIR VALUE (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Nov. 30, 2017
Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration			$ 200
Recurring
Fair value hierarchy for financial assets and liabilities
Assets	$ 15,127	$ 24,970
Liabilities	967	1,613
Recurring \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	472	464
Recurring \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration		156
Recurring \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	495	993
Recurring \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets		1,205
Recurring \| Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	37	95
Recurring \| Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	14,241	23,670
Recurring \| U.S. Agency discount notes
Fair value hierarchy for financial assets and liabilities
Assets	849
Recurring \| Level 1
Fair value hierarchy for financial assets and liabilities
Assets	37	95
Recurring \| Level 1 \| Money market funds
Fair value hierarchy for financial assets and liabilities
Assets	37	95
Recurring \| Level 2
Fair value hierarchy for financial assets and liabilities
Assets	15,090	24,875
Recurring \| Level 2 \| Corporate debt securities
Fair value hierarchy for financial assets and liabilities
Assets		1,205
Recurring \| Level 2 \| Commercial paper
Fair value hierarchy for financial assets and liabilities
Assets	14,241	23,670
Recurring \| Level 2 \| U.S. Agency discount notes
Fair value hierarchy for financial assets and liabilities
Assets	849
Recurring \| Level 3
Fair value hierarchy for financial assets and liabilities
Liabilities	967	1,613
Recurring \| Level 3 \| Zipsor
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	472	464
Recurring \| Level 3 \| Lazanda
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration		156
Recurring \| Level 3 \| CAMBIA
Fair value hierarchy for financial assets and liabilities
Liabilities, contingent consideration	$ 495	$ 993