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FAIR VALUE - Schedule of Fair Value Hierarchy for Financial Assets and Liabilities (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Total $ 22,535 $ 24,073
Liabilities:    
Total 1,066 1,038
Zipsor    
Liabilities:    
Contingent consideration 545 531
CAMBIA    
Liabilities:    
Contingent consideration 521 507
Money market funds    
Assets:    
Cash and cash equivalents 41 11
Agency bond    
Assets:    
Cash and cash equivalents   1,250
Commercial paper    
Assets:    
Cash and cash equivalents 14,591 14,028
U.S. Treasury Securities    
Assets:    
Cash and cash equivalents 748  
Collegium warrants | Collegium Pharmaceutical Inc    
Assets:    
Cash and cash equivalents 7,155 8,784
Level 1    
Assets:    
Total 41 11
Liabilities:    
Total 0 0
Level 1 | Zipsor    
Liabilities:    
Contingent consideration 0 0
Level 1 | CAMBIA    
Liabilities:    
Contingent consideration 0 0
Level 1 | Money market funds    
Assets:    
Cash and cash equivalents 41 11
Level 1 | Agency bond    
Assets:    
Cash and cash equivalents   0
Level 1 | Commercial paper    
Assets:    
Cash and cash equivalents 0 0
Level 1 | U.S. Treasury Securities    
Assets:    
Cash and cash equivalents 0  
Level 1 | Collegium warrants | Collegium Pharmaceutical Inc    
Assets:    
Cash and cash equivalents 0 0
Level 2    
Assets:    
Total 22,494 24,062
Liabilities:    
Total 0 0
Level 2 | Zipsor    
Liabilities:    
Contingent consideration 0 0
Level 2 | CAMBIA    
Liabilities:    
Contingent consideration 0 0
Level 2 | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Level 2 | Agency bond    
Assets:    
Cash and cash equivalents   1,250
Level 2 | Commercial paper    
Assets:    
Cash and cash equivalents 14,591 14,028
Level 2 | U.S. Treasury Securities    
Assets:    
Cash and cash equivalents 748  
Level 2 | Collegium warrants | Collegium Pharmaceutical Inc    
Assets:    
Cash and cash equivalents 7,155 8,784
Level 3    
Assets:    
Total 0 0
Liabilities:    
Total 1,066 1,038
Level 3 | Zipsor    
Liabilities:    
Contingent consideration 545 531
Level 3 | CAMBIA    
Liabilities:    
Contingent consideration 521 507
Level 3 | Money market funds    
Assets:    
Cash and cash equivalents 0 0
Level 3 | Agency bond    
Assets:    
Cash and cash equivalents   0
Level 3 | Commercial paper    
Assets:    
Cash and cash equivalents 0 0
Level 3 | U.S. Treasury Securities    
Assets:    
Cash and cash equivalents 0  
Level 3 | Collegium warrants | Collegium Pharmaceutical Inc    
Assets:    
Cash and cash equivalents $ 0 $ 0