GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 02, 2015
Intangible Assets, Net[Abstract]
Total intangible assets, Gross		$ 68,460	$ 58,780
Accumulated amortization		(30,295)	(23,256)
Total	[1]	32,214
Total Intangible Assets, Net		38,165	35,524
Amortization of intangibles		$ 7,039	6,072	$ 7,404
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
Leases, Acquired-in-Place [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		$ 660	0
Accumulated amortization		(120)	0
Total		540	0
Technology licenses [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		3,000	3,000
Accumulated amortization		(2,925)	(2,625)
Total		75	375
Patent rights [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		1,949	1,949
Accumulated amortization		(1,949)	(1,949)
Total		0	0
Developed technology [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		33,270	26,670
Accumulated amortization		(11,670)	(7,828)
Total		$ 21,600	18,842
Developed technology [Member] | Cambridge Semiconductor Limited [Member]
Intangible Assets and Goodwill [Line Items]
Intangible assets					6,600
Developed technology [Member] | Minimum [Member] | Cambridge Semiconductor Limited [Member]
Intangible Assets and Goodwill [Line Items]
Useful life (in years)		3 years
Developed technology [Member] | 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	17,610
Accumulated amortization		(10,031)	(7,254)
Total		$ 9,999	10,356
Customer relationships [Member] | Cambridge Semiconductor Limited [Member]
Intangible Assets and Goodwill [Line Items]
Intangible assets					$ 2,420
Useful life (in years)		5 years
Trade names [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		$ 3,600	3,600
Accumulated amortization		(3,600)	(3,600)
Total		0	0
Internet Domain Names [Member]
Intangible Assets, Net[Abstract]
Indefinite-lived intangible assets		1,261	1,261
In-process research and developement [Member]
Intangible Assets, Net[Abstract]
Finite-Lived Intangible Assets, Gross		4,690	4,690
Total		4,690	$ 4,690
In-process research and developement [Member] | Early Stage Research And Developement Company [Member]
Intangible Assets and Goodwill [Line Items]
Finite-lived intangible assets		$ 4,700

[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.