| Schedule of Goodwill [Table Text Block] | 
The following table presents the changes in the carrying amount of goodwill for the periods indicated:     
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   | 
Years Ended December 31,  | 
 
   | 
2016  | 
   | 
2015  | 
 
   | 
(in thousands)  | 
 
Beginning balance  | 
$  | 
49,779  | 
 
  | 
   | 
$  | 
1,201  | 
 
  | 
 
Acquisition of wireless infrastructure access business  | 
6,935  | 
 
  | 
   | 
—  | 
 
  | 
 
Acquisition of wireless infrastructure backhaul business  | 
19,301  | 
 
  | 
   | 
—  | 
 
  | 
 
Acquisition of Entropic  | 
—  | 
 
  | 
   | 
48,578  | 
 
  | 
 
Ending balance  | 
$  | 
76,015  | 
 
  | 
   | 
$  | 
49,779  | 
 
  | 
 
  
 
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| Schedule of Finite-Lived Intangible Assets [Table Text Block] | 
The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions and technology licenses purchased, which continue to be amortized: 
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   | 
   | 
   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
 Weighted 
Average 
Useful Life 
(in Years) 
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   | 
Gross Carrying Amount  | 
   | 
Accumulated Amortization  | 
   | 
Net Carrying Amount  | 
   | 
Gross Carrying Value  | 
   | 
Accumulated Amortization  | 
   | 
Net Carrying Amount  | 
 
   | 
   | 
   | 
(in thousands)  | 
 
Licensed technology  | 
3  | 
   | 
$  | 
3,311  | 
 
  | 
   | 
$  | 
(2,957  | 
)  | 
   | 
$  | 
354  | 
 
  | 
   | 
$  | 
2,921  | 
 
  | 
   | 
$  | 
(2,725  | 
)  | 
   | 
$  | 
196  | 
 
  | 
 
Developed technology  | 
7  | 
   | 
77,800  | 
 
  | 
   | 
(13,550  | 
)  | 
   | 
64,250  | 
 
  | 
   | 
47,000  | 
 
  | 
   | 
(4,652  | 
)  | 
   | 
42,348  | 
 
  | 
 
Trademarks and trade names  | 
7  | 
   | 
1,700  | 
 
  | 
   | 
(405  | 
)  | 
   | 
1,295  | 
 
  | 
   | 
1,700  | 
 
  | 
   | 
(162  | 
)  | 
   | 
1,538  | 
 
  | 
 
Customer relationships  | 
3.7  | 
   | 
20,000  | 
 
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   | 
(4,782  | 
)  | 
   | 
15,218  | 
 
  | 
   | 
4,700  | 
 
  | 
   | 
(627  | 
)  | 
   | 
4,073  | 
 
  | 
 
Covenants non-compete  | 
3  | 
   | 
900  | 
 
  | 
   | 
(156  | 
)  | 
   | 
744  | 
 
  | 
   | 
—  | 
 
  | 
   | 
—  | 
 
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   | 
—  | 
 
  | 
 
Backlog  | 
0.5  | 
   | 
26,600  | 
 
  | 
   | 
(26,600  | 
)  | 
   | 
—  | 
 
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   | 
24,200  | 
 
  | 
   | 
(24,200  | 
)  | 
   | 
—  | 
 
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   | 
   | 
   | 
$  | 
130,311  | 
 
  | 
   | 
$  | 
(48,450  | 
)  | 
   | 
$  | 
81,861  | 
 
  | 
   | 
$  | 
80,521  | 
 
  | 
   | 
$  | 
(32,366  | 
)  | 
   | 
$  | 
48,155  | 
 
  | 
 
  
  
The amortization expense related to intangible assets for the years ended December 31, 2016, 2015 and 2014 was $16.1 million, $29.9 million and $0.4 million, respectively. 
 
  
The following table sets forth the Company’s activities related to finite-lived intangible assets resulting from acquisitions, other additions, transfers to developed technology from IPR&D, and the related amortization of acquired finite-lived intangible assets:
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   | 
Years Ended December 31,  | 
 
   | 
2016  | 
   | 
2015  | 
 
   | 
(in thousands)  | 
 
Beginning balance  | 
$  | 
48,155  | 
 
  | 
   | 
$  | 
3,086  | 
 
  | 
 
Acquisition of Entropic  | 
—  | 
 
  | 
   | 
74,200  | 
 
  | 
 
Acquisition of wireless infrastructure access business  | 
12,300  | 
 
  | 
   | 
—  | 
 
  | 
 
Acquisition of wireless infrastructure backhaul business  | 
34,000  | 
 
  | 
   | 
—  | 
 
  | 
 
Other additions  | 
390  | 
 
  | 
   | 
100  | 
 
  | 
 
Transfers to developed technology from IPR&D  | 
3,100  | 
 
  | 
   | 
700  | 
 
  | 
 
Amortization  | 
(16,084  | 
)  | 
   | 
(29,931  | 
)  | 
 
Ending balance  | 
$  | 
81,861  | 
 
  | 
   | 
$  | 
48,155  | 
 
  | 
 
  
 
 
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| Schedule of Indefinite-Lived Intangible Assets [Table Text Block] | 
The following table sets forth the Company’s activities related to the indefinite-lived intangible assets resulting from additions to IPR&D through acquisitions, transfers to developed technology from IPR&D and impairment losses:
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   | 
Years Ended December 31,  | 
 
   | 
2016  | 
   | 
2015  | 
 
   | 
(in thousands)  | 
 
Beginning balance  | 
$  | 
3,200  | 
 
  | 
   | 
$  | 
7,300  | 
 
  | 
 
Acquisition of Entropic  | 
—  | 
 
  | 
   | 
18,200  | 
 
  | 
 
Acquisition of wireless infrastructure access business  | 
1,300  | 
 
  | 
   | 
—  | 
 
  | 
 
Acquisition of wireless infrastructure backhaul business  | 
22,300  | 
 
  | 
   | 
—  | 
 
  | 
 
Transfers to developed technology from IPR&D  | 
(3,100  | 
)  | 
   | 
(700  | 
)  | 
 
Impairment losses  | 
$  | 
(1,300  | 
)  | 
   | 
$  | 
(21,600  | 
)  | 
 
Ending balance  | 
$  | 
22,400  | 
 
  | 
   | 
$  | 
3,200  | 
 
  | 
 
  
 
  
 
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