SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Revenue [Abstract]
Sell-through deferred revenue	$ 28,100	$ 25,700
Sell-through deferred cost	11,900	10,600
Inventories [Abstract]
Raw materials	14,610	19,090
Work-in-process	15,194	12,770
Finished goods	22,760	20,074
Total	52,564	51,934
Accounts Receivable [Abstract]
Accounts receivable trade	46,849	43,622
Accrued ship and debit and rebate claims	(39,363)	(35,486)
Allowance for doubtful accounts	(525)	(318)
Total	6,961	7,818
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid legal fees	212	2,023
Advance to suppliers	69	324
Prepaid income tax	2,431	309
Prepaid maintenance agreements	1,399	736
Interest receivable	743	519
Other	3,666	2,879
Total	8,520	6,790
Employee Benefits Plan [Abstract]
Discretionary company contribution to 401(k)	1,100	1,100	$ 1,100
Foreign Exchange Transactions [Abstract]
Foreign exchange transaction gain	$ (100)	(500)	100
Warranty [Abstract]
Product warranty period	12 months
Advertising [Abstract]
Advertising costs	$ 1,300	$ 1,100	$ 1,500
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] | 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)