Related-Party Transactions (Narrative) (Details) € in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
Jan. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Legal services and costs \| $		$ 71	$ 103
Soundperience [Member]
Payments for Software \| €	€ 1,750
Percent Of Ownership Interest Transferred	49.00%

The cash outflow associated with the development, modification or acquisition of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

Name:	us-gaap_PaymentsForSoftware
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration