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Commitments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
€ / $
Dec. 31, 2017
USD ($)
€ / $
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Disclosure of transactions between related parties [line items]          
Euro: US dollar exchange rate | € / $   1.14 1.2    
Right of use asset $ 562 $ 0      
Lease liability 800 0      
Depreciation of right of use asset 112 0 $ 0    
Interest expense on lease liabilities 51 0 0    
Current lease liabilities 208 0      
Non-current lease liabilities 469 0      
Cyberonica S.A.          
Disclosure of transactions between related parties [line items]          
Monthly rental expense       $ 11,900 € 10,360
Right of use asset   674      
Lease liability   674      
Depreciation of right of use asset 112        
Interest expense on lease liabilities 51        
Rental expense $ 139 $ 147 $ 140