Goodwill and Intangible Assets, Net - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquisition-related intangible assets, net
Impairment of intangible assets		$ 1,209
Accumulated Amortization	$ (29,012)	(24,488)
Net Carrying Amount	6,872
Foreign exchange impact	(23)	50
Total Intangible Assets, Gross	35,934	35,957
Total Intangible Assets, Net	6,922	11,469
Domain name
Acquisition-related intangible assets, net
Indefinite-Lived Intangible Assets	50	50
Technology
Acquisition-related intangible assets, net
Gross Carrying Amount	24,500	24,500
Accumulated Amortization	(21,513)	(18,116)
Net Carrying Amount	2,987	6,384
Customer relationships
Acquisition-related intangible assets, net
Impairment of intangible assets		1,209
Gross Carrying Amount	9,714	9,737
Accumulated Amortization	(6,016)	(5,113)
Net Carrying Amount	3,698	4,624
Customer relationships | TVN
Acquisition-related intangible assets, net
Identified intangible assets acquired		2,045
Foreign exchange transaction gain (loss)		(3)
Trademarks and trade name
Acquisition-related intangible assets, net
Gross Carrying Amount	1,670	1,670
Accumulated Amortization	(1,483)	(1,259)
Net Carrying Amount	$ 187	411
Trademarks and trade name | TVN
Acquisition-related intangible assets, net
Identified intangible assets acquired		$ 21