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Commitments (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
€ / $
Dec. 31, 2017
EUR (€)
€ / $
Dec. 31, 2016
USD ($)
€ / $
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Disclosure of transactions between related parties [line items]          
Euro: US dollar exchange rate | € / $ 1.2 1.2 1.05    
Cyberonica S.A.          
Disclosure of transactions between related parties [line items]          
Monthly rental expense $ 10,900 € 10,360   $ 16,000 € 14,578
Rental expense | $ $ 140,000   $ 138,000 $ 195,000