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General (Details)
€ in Thousands
9 Months Ended
Jan. 19, 2017
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Hearing Help Express (HHE) [Member]      
Acquisition of remaining percentage stake 80.00%    
Soundperience GmbH [Member]      
Ownership interest     16.00%
Purchase price | €   € 1,200  
Equity method investment     $ 1,255,000
Soundperience GmbH [Member] | Scenario, Plan [Member]      
Ownership interest     49.00%
Maximum [Member] | Hearing Help Express (HHE) [Member]      
Majority owner losses required to be reclassified     $ 700,000
Minimum [Member] | Hearing Help Express (HHE) [Member]      
Majority owner losses required to be reclassified     $ 500,000