SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Gross unrealized gains	$ 8	$ 128
Weighted Average Interest Rate on Investments	0.84%	0.76%
Deferred Revenue [Abstract]
Sell-through deferred revenue	$ 25,700	$ 25,000
Sell-through deferred cost	10,600	9,800
Inventories [Abstract]
Raw materials	19,090	21,127
Work-in-process	12,770	14,643
Finished goods	20,074	28,255
Total	51,934	64,025
Accounts Receivable [Abstract]
Accounts receivable trade	43,622	38,344
Accrued ship and debit and rebate claims	(35,486)	(27,967)
Allowance for doubtful accounts	(318)	(191)
Total	7,818	10,186
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid legal fees	2,023	1,506
Loan to Cambridge Semiconductor	0	6,600
Advance to supplier	324	800
Prepaid income tax	309	3,208
Prepaid maintenance agreements	736	1,023
Interest receivable	519	664
Other	2,879	2,578
Total	6,790	16,379
Employee Benefits Plan [Abstract]
Discretionary company contribution to 401(k)	1,100	1,100	$ 1,100
Foreign Exchange Transactions [Abstract]
Foreign exchange transaction gain	$ (500)	100	(100)
Warranty [Abstract]
Product warranty period	12 months
Advertising [Abstract]
Advertising costs	$ 1,100	$ 1,500	$ 1,400
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Distributors [Member]
Concentration Risk [Line Items]
Concentration risk percentage	75.00%
2007 through 2009 [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Disclosure [Abstract]
Foreign earnings repatriated		$ 5,000
2007 through 2009 [Member] | Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Abstract]
Income tax liability (refund) adjustment from settlement with taxing authority		(2,800)
2007 through 2009 [Member] | Internal Revenue Service (IRS) [Member] | State and Local Jurisdiction [Member]
Income Tax Disclosure [Abstract]
Income tax liability (refund) adjustment from settlement with taxing authority		$ (500)