Fair Value Measurement (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill Impairment		$ 3,400	$ 51,200
Impairment of intangible assets including goodwill		3,400	$ 55,000	$ 2,200
Cloud Tv Reporting Unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill Impairment	$ 51,200	1,200
Impairment of intangible assets including goodwill	51,200	3,400
Cloud Tv Reporting Unit | ActiveVideo acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill Impairment	51,200
Impairment of intangible assets	3,800
Impairment of intangible assets including goodwill	51,200
Non-controlling Interest | Cloud Tv Reporting Unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill Impairment	17,900	3,400
Impairment of intangible assets including goodwill	$ 17,900	$ 1,200