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Commitments - Additional Information (Detail)
€ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2017
ft²
Jun. 30, 2017
ft²
Dec. 31, 2017
EUR (€)
ft²
m²
Facilities
Dec. 31, 2017
USD ($)
Facilities
May 31, 2017
USD ($)
Apr. 30, 2016
USD ($)
Disclosure of commitments [line items]            
Future rental payments     € 14,991      
Other agreements [member] | Contract Research Organizations [Member] | Viaskin Peanuts And Viaskin Milk Products [member]            
Disclosure of commitments [line items]            
Launching value of clinical studies     78,700      
Remaining value of clinical studies     32,600      
Monetary market fund [member] | Other agreements [member]            
Disclosure of commitments [line items]            
Sum of term deposit     € 227      
Term deposit period     3 years      
Property, plant and equipment subject to operating leases [member] | Letter of credit 1 [member] | Other agreements [member]            
Disclosure of commitments [line items]            
Future rental payments | $       $ 164 $ 300 $ 143
Not Later Than One Year [member]            
Disclosure of commitments [line items]            
Future rental payments     € 2,617      
Later Than One Year and Not Later Than Two Years [member]            
Disclosure of commitments [line items]            
Future rental payments     2,623      
Later Than Two Years and Not Later Than Three Years [member]            
Disclosure of commitments [line items]            
Future rental payments     2,357      
Later Than Three Years and Not Later Than Four Years [member]            
Disclosure of commitments [line items]            
Future rental payments     2,169      
Office equipment and vehicles [member] | Not Later Than One Year [member]            
Disclosure of commitments [line items]            
Future rental payments     116      
Office equipment and vehicles [member] | Later Than One Year and Not Later Than Two Years [member]            
Disclosure of commitments [line items]            
Future rental payments     77      
Office equipment and vehicles [member] | Later Than Two Years and Not Later Than Three Years [member]            
Disclosure of commitments [line items]            
Future rental payments     70      
Office equipment and vehicles [member] | Later Than Three Years and Not Later Than Four Years [member]            
Disclosure of commitments [line items]            
Future rental payments     € 16      
North america [member] | Rental agreements [member]            
Disclosure of commitments [line items]            
Area of office and laboratory space | ft² 3,780 3,913        
Subleases expiration period     Jun. 30, 2017      
Additional initial Period of sublease     5 years      
Bagneux [member] | Monetary market fund [member] | Other agreements [member]            
Disclosure of commitments [line items]            
Guarantee for ordinary rental agreements of the premises     € 300      
Facility [member] | Rental agreements [member]            
Disclosure of commitments [line items]            
Office and laboratory space | m²     4,770      
Number of facilities | Facilities     2 2    
Lease agreement date     Mar. 09, 2015      
Leases expires period     Mar. 08, 2024      
Second Facility [member] | Rental agreements [member]            
Disclosure of commitments [line items]            
Office and laboratory space | m²     2,237      
Leases expires period     May 31, 2020      
Commercial Facility [member] | Bottom of range [member]            
Disclosure of commitments [line items]            
Lease extension period     2 years      
Commercial Facility [member] | Top of range [member]            
Disclosure of commitments [line items]            
Lease extension period     5 years      
Commercial Facility [member] | Rental agreements [member]            
Disclosure of commitments [line items]            
Office and laboratory space | ft²     8,919      
Lease commenced period     Eight years and four months.