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The Company - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jun. 21, 2016
Director
Sep. 30, 2016
Patient
Dec. 31, 2017
Disclosure Of Company [Line items]      
Number of directors after additions | Director 8    
Viaskin Peanut [member] | Bottom of range [member]      
Disclosure Of Company [Line items]      
Age of patients evaluated     4 years
Viaskin Peanut [member] | Top of range [member]      
Disclosure Of Company [Line items]      
Age of patients evaluated     11 years
Viaskin Milk [member]      
Disclosure Of Company [Line items]      
Number of patients evaluated | Patient   198  
Viaskin Milk [member] | Bottom of range [member]      
Disclosure Of Company [Line items]      
Age of patients evaluated   2 years  
Viaskin Milk [member] | Top of range [member]      
Disclosure Of Company [Line items]      
Age of patients evaluated   17 years