STOCK BASED COMPENSATION, Allocation of Recognized Period Costs (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended						3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012 Price Range 1.23 to 1.93 [Member]	Sep. 29, 2012 Price Range 2.10-3.24 [Member]	Sep. 29, 2012 Price Range 3.30-8.79 [Member]	Sep. 29, 2012 Price Range 8.84-18.98 [Member]	Apr. 02, 2011 Contract Termination [Member] Accelerated Stock Based Compensation [Member]	Sep. 29, 2012 Cost of Sales [Member]	Oct. 01, 2011 Cost of Sales [Member]	Sep. 29, 2012 Cost of Sales [Member]	Oct. 01, 2011 Cost of Sales [Member]	Sep. 29, 2012 Research and Development Expenses [Member]	Oct. 01, 2011 Research and Development Expenses [Member]	Sep. 29, 2012 Research and Development Expenses [Member]	Oct. 01, 2011 Research and Development Expenses [Member]	Sep. 29, 2012 Selling and Administrative Expenses [Member]	Oct. 01, 2011 Selling and Administrative Expenses [Member]	Sep. 29, 2012 Selling and Administrative Expenses [Member]	Oct. 01, 2011 Selling and Administrative Expenses [Member]	Sep. 29, 2012 Restructuring Charge [Member]	Oct. 01, 2011 Restructuring Charge [Member]	Sep. 29, 2012 Restructuring Charge [Member]	Oct. 01, 2011 Restructuring Charge [Member]	Sep. 29, 2012 Restricted Stock [Member]	Oct. 01, 2011 Restricted Stock [Member]	Sep. 29, 2012 Restricted Stock [Member]	Oct. 01, 2011 Restricted Stock [Member]	Sep. 29, 2012 ESP Plan [Member]	Oct. 01, 2011 ESP Plan [Member]	Sep. 29, 2012 ESP Plan [Member]	Oct. 01, 2011 ESP Plan [Member]	Sep. 29, 2012 Stock options [Member]	Oct. 01, 2011 Stock options [Member]	Sep. 29, 2012 Stock options [Member]	Oct. 01, 2011 Stock options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,193	$ 2,230	$ 4,780	$ 8,296						$ 208	$ 400	$ 737	$ 1,603	$ 387	$ 512	$ 1,373	$ 2,785	$ 598	$ 1,318	$ 2,605	$ 3,988	$ 0	$ 0	$ 65	$ (80)	$ 1,026	$ 1,698	$ 3,935	$ 6,584	$ 40	$ 100	$ 310	$ 500	$ 127	$ 432	$ 535	$ 1,212
Management separation charge									$ 684
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)					$ 1.23	$ 2.10	$ 3.30	$ 8.84
Exercise price range, upper range limit (in dollars per share)					$ 1.93	$ 3.24	$ 8.79	$ 18.98
Outstanding options (in shares)					799	1,017	636	602
Weighted average remaining contractual term (in years)					5 years 4 months 24 days	4 years 10 months 24 days	2 years 3 months 18 days	3 years 7 months 6 days
Weighted average exercise price (in dollars per share)					$ 1.93	$ 3.12	$ 6.59	$ 9.34
Number of exercisable Options (in shares)					797	561	607	601
Exercisable options, Weighted average exercise price (in dollars per share)					$ 1.93	$ 3.03	$ 6.64	$ 9.34