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Medicis Settlement - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2012
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2014
Dec. 31, 2013
Medicis Pharmaceutical Corporation          
Settlement And Termination [Line Items]          
Settlement consideration payable $ 25.0        
Upfront payment paid 7.0        
Medicis Pharmaceutical Corporation | Proceeds Sharing Arrangement          
Settlement And Termination [Line Items]          
Settlement agreement, payable $ 14.0        
Settlement payment       $ 7.1 $ 6.9
Medicis Pharmaceutical Corporation | Product Approval Payment Derivative          
Settlement And Termination [Line Items]          
Derivative liability for the Product Approval Payment   $ 2.8 $ 2.7    
Valeant Pharmaceuticals International, Inc. | Product Approval Payment Derivative          
Settlement And Termination [Line Items]          
Accrued milestone obligations   $ 4.0      
Measurement Input, Expected Term | Medicis Pharmaceutical Corporation | Product Approval Payment Derivative          
Settlement And Termination [Line Items]          
Fair Value, Measurement Input, Duration   1 year 4 months 24 days 1 year 6 months    
Measurement Input, Risk Free Interest Rate | Medicis Pharmaceutical Corporation | Product Approval Payment Derivative          
Settlement And Termination [Line Items]          
Fair Value, Measurement Input   1.80% 2.60%    
Measurement Input, Entity Credit Risk | Medicis Pharmaceutical Corporation | Product Approval Payment Derivative          
Settlement And Termination [Line Items]          
Fair Value, Measurement Input   7.50% 8.00%