| Schedule of Goodwill [Table Text Block] | 
The following table presents the changes in the carrying amount of goodwill for the periods indicated:     
|  |  
|  |  |  |  |  |  |  |  |  
|   | 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 | 
 |  | 
| 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: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   |   | December 31, 2016 |   | December 31, 2015 |  
|   | Weighted Average Useful Life (in Years) |   | 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 | 
 |   | (4,782 | ) |   | 15,218 | 
 |   | 4,700 | 
 |   | (627 | ) |   | 4,073 | 
 |  
| Covenants non-compete | 3 |   | 900 | 
 |   | (156 | ) |   | 744 | 
 |   | — | 
 |   | — | 
 |   | — | 
 |  
| Backlog | 0.5 |   | 26,600 | 
 |   | (26,600 | ) |   | — | 
 |   | 24,200 | 
 |   | (24,200 | ) |   | — | 
 |  
|   |   |   | $ | 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:
|  |  
|  |  |  |  |  |  |  |  |  
|   | 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 | 
 |  | 
| 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:
|  |  
|  |  |  |  |  |  |  |  |  
|   | 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 | 
 |  
 |