Goodwill and Intangible Assets Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 71
Intangible assets, gross (excluding goodwill)		$ 4,840	$ 5,661
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		7 years
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives		3 years 8 months 7 days
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives		8 years 6 months 31 days
Finite-lived intangible assets
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives		4 years 8 months 30 days
Headland Media Limited | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		10 years
Headland Media Limited | Distribution rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		15 years
Q1 2017 Acquisition
Finite-Lived Intangible Assets [Line Items]
Contingent consideration, value, high				$ 114
Intangible assets, gross (excluding goodwill)		$ 249
Contingent consideration		$ 71
Q1 2017 Acquisition | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives	10 years
Finite-lived intangible assets acquired	$ 100