SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Inventories [Abstract]
Raw materials	$ 12,389,000				$ 20,334,000				$ 12,389,000	$ 20,334,000
Work-in-process	7,841,000				13,171,000				7,841,000	13,171,000
Finished goods	31,780,000				28,572,000				31,780,000	28,572,000
Total	52,010,000				62,077,000				52,010,000	62,077,000
Accounts Receivable [Abstract]
Accounts receivable trade	27,972,000				30,656,000				27,972,000	30,656,000
Accrued ship and debit and rebate claims	(18,361,000)				(24,839,000)				(18,361,000)	(24,839,000)
Allowance for doubtful accounts	(215,000)				(275,000)				(215,000)	(275,000)
Other	0				171,000				0	171,000
Total	9,396,000				5,713,000				9,396,000	5,713,000
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid legal fees	3,500,000				4,000,000				3,500,000	4,000,000
Prepaid inventory	0				917,000				0	917,000
Prepaid income tax	118,000				1,117,000				118,000	1,117,000
Prepaid maintenance agreements	669,000				554,000				669,000	554,000
Interest receivable	625,000				737,000				625,000	737,000
Other	2,156,000				1,938,000				2,156,000	1,938,000
Total	7,068,000				9,263,000				7,068,000	9,263,000
Other Assets [Abstract]
Prepaid royalty (Note 12)	10,000,000				10,000,000				10,000,000	10,000,000
Investment in third party (Note 12)	7,000,000				7,000,000				7,000,000	7,000,000
Financing lease receivables and deposits (Note 13)	7,558,000				0				7,558,000	0
Other	1,953,000				288,000				1,953,000	288,000
Total	26,511,000				17,288,000				26,511,000	17,288,000
Other Accrued Liabilities [Abstract]
Accrued payment for acquisition (Note 11)	0				6,955,000				0	6,955,000
Accrued professional fees	892,000				1,013,000				892,000	1,013,000
Accrued expense for engineering wafers	402,000				502,000				402,000	502,000
Advances from customers	596,000				713,000				596,000	713,000
Other	415,000				365,000				415,000	365,000
Total	2,305,000				9,548,000				2,305,000	9,548,000
Employee Benefits Plan [Abstract]
Company contribution to 401(k)									0	700,000	700,000
Deferred Revenue [Abstract]
Sell-through deferred revenue	16,700,000				24,700,000				16,700,000	24,700,000
Sell-through deferred cost	8,800,000				12,500,000				8,800,000	12,500,000
Foreign Exchange Transactions [Abstract]
Foreign exchange transaction gain									50,000
Foreign exchange transaction losses										400,000	300,000
Warranty [Abstract]
Product warranty period									12 months
Advertising [Abstract]
Advertising costs									1,000,000	1,000,000	400,000
Comprehensive Income, Net of Taxes [Abstract]
Net income	6,326,000	7,512,000	10,599,000	9,854,000	8,929,000	12,634,000	15,587,000	12,314,000	34,291,000	49,464,000	23,269,000
Other comprehensive income:
Translation adjustments									(35,000)	81,000	61,000
Total comprehensive income									$ 34,256,000	$ 49,545,000	$ 23,330,000
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Distributors [Member]
Deferred Revenue [Abstract]
Concentration risk percentage	71.00%								71.00%