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Related-Party Transactions (Narrative) (Details)
€ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Related Party Transaction [Line Items]          
Legal services and costs | $   $ 63 $ 238 $ 169 $ 413
Soundperience [Member]          
Related Party Transaction [Line Items]          
Payments for Software | € € 1,750        
Percent Of Ownership Interest Transferred 49.00%