Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Schedule of Goodwill (Details)

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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Impairment losses $ 2,198,000 $ 2,000,000 $ 1,300,000
Goodwill 238,330,000 237,992,000 $ 76,015,000
Goodwill, Acquired During Period 0 162,318,000  
Goodwill, Purchase Accounting Adjustments (338,000)    
Goodwill impairment loss $ 0    
Wireless Infrastructure Backhaul Business of Broadcom Corporation [Member]      
Goodwill [Line Items]      
Goodwill, Purchase Accounting Adjustments   (341,000)  
Indefinite-lived Intangible Assets [Member]      
Goodwill [Line Items]      
Impairment losses   $ 2,000,000