Business Acquisition - Acquisition and Integration Expenses (Details) - TVN [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Cost of Goods, Product Line [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	[1]	$ 342	$ 1,049
Business Combination, Acquisition Related Costs			0
Research and Development Expense [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	[1]	7	974
Business Combination, Acquisition Related Costs			0
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	[1]	2,469	11,058
Business Combination, Acquisition Related Costs			3,855
Operating expense [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs	[1]	$ 2,818	13,081
Business Combination, Acquisition Related Costs			$ 3,855

[1] Integration-related costs include incremental costs resulting from the TVN acquisition that are not expected to generate future benefits once the integration is fully consummated. All integration efforts were completed by 2017 and the Company does not expect any more such expenses to continue after 2017.