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Business Combination and BELBUCA Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 06, 2017
Business Acquisition [Line Items]      
Income tax benefit $ (13) $ 15,972  
BELBUCA [Member]      
Business Acquisition [Line Items]      
Useful life of equipment 7 years    
Deferred tax liability     $ (15,972)
Income tax benefit   $ 16,000  
BELBUCA [Member] | License and Distribution Rights [Member]      
Business Acquisition [Line Items]      
Amortization of intangible asset 10 years    
Endo Agreement [Member]      
Business Acquisition [Line Items]      
Termination agreement date Dec. 07, 2016    
License termination effective date Jan. 06, 2017    
Potential milestone payments on intellectual property rights $ 5,000    
Term of Endo Agreement 2 years    
Contract termination claims, description In addition to the Purchase Price, pursuant to the terms of the Termination Agreement, the Company also paid to Endo a fee in the amount of $5 million in consideration for (i) Endo's agreement not to compete for a period of two years from the closing date of the termination agreement and (ii) Endo's waiver of its right to sell product for twelve months following the closing of the termination agreement.