Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 01, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Indefinite-lived intangible assets:
Indefinite lived intangible assets		$ 497	$ 497
Definite-lived intangible assets:
Gross Carrying Amount		5,767	5,297
Accumulated Amortization		(2,245)	(1,640)
Net Cost		3,522	3,657
Total intangible assets, Gross Carrying Amount		6,264	5,794
Total intangible assets, Net Cost		4,019	4,154
Impairment of intangible assets		0
Amortization expense		2,200	800	$ 400
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018		900
2019		800
2020		700
2021		500
Thereafter		700
Customer and advertiser relationships
Definite-lived intangible assets:
Gross Carrying Amount		3,473	3,743
Accumulated Amortization		(1,354)	(1,095)
Net Cost		2,119	2,648
Media content
Definite-lived intangible assets:
Gross Carrying Amount		325	325
Accumulated Amortization		(244)	(179)
Net Cost		81	146
Patents and developed technology
Definite-lived intangible assets:
Gross Carrying Amount		1,170	430
Accumulated Amortization		(412)	(217)
Net Cost		758	213
Impairment charges	$ 300
Service contracts and other
Definite-lived intangible assets:
Gross Carrying Amount		94	94
Accumulated Amortization		(94)	(75)
Net Cost		0	19
Trademarks and trade names
Definite-lived intangible assets:
Gross Carrying Amount		705	705
Accumulated Amortization		(141)	(74)
Net Cost		564	631
Trade names
Indefinite-lived intangible assets:
Indefinite lived intangible assets		480	480
URLs
Indefinite-lived intangible assets:
Indefinite lived intangible assets		$ 17	$ 17