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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, 2017
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   $ 2.2    
Remaining contractual term (in years)   3 years    
Risk-free interest rate   1.55%    
Fair value assumptions, credit risk adjustment (percent)   7.00%    
Valeant Pharmaceuticals International, Inc. | Product Approval Payment Derivative        
Settlement And Termination [Line Items]        
Accrued milestone obligations   $ 4.0