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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2015
Intangible Assets, Net[Abstract] |  |  |  |  |
Total intangible assets, Gross |  | $ 59,911 | $ 62,911 |  |
Accumulated amortization |  | (34,492) | (31,409) |  |
Total Finite Lived Intangible Assets, Net | [1] | 19,468 |  |  |
Total Intangible Assets, Net |  | 25,419 | 31,502 |  |
Amortization of intangibles |  | $ 6,083 | 6,663 | $ 7,039 |
Cambridge Semiconductor Limited [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | $ 9,020
Minimum [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Useful life (in years) |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Useful life (in years) |  | 12 years |  |  |
Developed technology |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 33,270 | 33,270 |  |
Accumulated amortization |  | (19,211) | (15,455) |  |
Total Finite Lived Intangible Assets, Net |  | $ 14,059 | 17,815 |  |
Developed technology | Cambridge Semiconductor Limited [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 6,600
Developed technology | Minimum [Member] | Cambridge Semiconductor Limited [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Useful life (in years) |  | 3 years |  |  |
Developed technology | Maximum [Member] | Cambridge Semiconductor Limited [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Useful life (in years) |  | 7 years |  |  |
Customer relationships [Member] |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 20,030 | 20,030 |  |
Accumulated amortization |  | (14,621) | (12,474) |  |
Total Finite Lived Intangible Assets, Net |  | $ 5,409 | 7,556 |  |
Customer relationships [Member] | Cambridge Semiconductor Limited [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | $ 2,420
Useful life (in years) |  | 5 years |  |  |
Technology licenses [Member] |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 0 | 3,000 |  |
Accumulated amortization |  | 0 | (3,000) |  |
Total Finite Lived Intangible Assets, Net |  | 0 | 0 |  |
Leases, Acquired-in-Place [Member] |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 660 | 660 |  |
Accumulated amortization |  | (660) | (480) |  |
Total Finite Lived Intangible Assets, Net |  | 0 | 180 |  |
Domain name |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Indefinite-lived intangible assets |  | 1,261 | 1,261 |  |
In-process research and development |  |  |  |  |
Intangible Assets, Net[Abstract] |  |  |  |  |
Finite-Lived Intangible Assets, Gross |  | 4,690 | 4,690 |  |
Total Finite Lived Intangible Assets, Net |  | 4,690 | $ 4,690 |  |
In-process research and development | Early Stage Research And Developement Company [Member] |  |  |  |  |
Intangible Assets and Goodwill [Line Items] |  |  |  |  |
Finite-lived intangible assets |  | $ 4,690 |  |  |
[1] | The total above excludes $4.7 million of in-process R&D which will be amortized upon completion of development over the estimated useful life of the technology.

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