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Commitments and Contingencies - Additional Information (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
Loss Contingencies [Line Items]  
Indemnification liability recorded during the period $ 0
List Laboratories | Product Approval Payment Derivative  
Loss Contingencies [Line Items]  
Accrued milestone obligations 2,000,000.0
Botulinum Toxin Research Associates, Inc.  
Loss Contingencies [Line Items]  
Accrued milestone obligations 16,000,000.0
BioSentinel, Inc.  
Loss Contingencies [Line Items]  
Accrued milestone obligations 300,000
Other Current Liabilities  
Loss Contingencies [Line Items]  
Fair value of assets acquired 1,000,000.0
Service Agreements | Ajinomoto Althea, Inc.  
Loss Contingencies [Line Items]  
Prepaid purchase obligations $ 1,300,000