Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Operating activities
Net loss	$ (17,421,000)	$ (12,661,000)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	3,280,000	3,391,000
Net amortization of investment premiums and discounts	655,000	1,076,000
Net loss on sale of investments		210,000
Bad debt expense		3,017,000
Equity-based compensation	1,836,000	2,941,000
Change in the fair value of acquisition-related contingent consideration	(24,000)	443,000
Deferred income taxes	(1,013,000)	(5,418,000)
Loss (gain) on divestitures	208,000	(2,207,000)
Loss (gain) on disposal of equipment	(153,000)	168,000
Changes in operating assets and liabilities	4,285,000	(5,430,000)
Total adjustments	9,074,000	(1,809,000)
Net cash and cash equivalents used in operating activities	(8,347,000)	(14,470,000)
Investing activities
Purchases of investments	(32,606,000)	(32,987,000)
Proceeds from sales and maturities of investments	31,736,000	41,346,000
Proceeds from sale of equipment	153,000
Purchases of leasehold improvements and equipment	(928,000)	(2,114,000)
Net cash and cash equivalents provided by (used in) investing activities	(1,145,000)	9,245,000
Financing activities
Payment of acquisition-related contingent consideration	(40,000)	(3,345,000)
Net proceeds from issuance of common stock	1,905,000	1,865,000
Net cash and cash equivalents provided by (used in) financing activities	1,865,000	(1,480,000)
Effect of exchange rate changes on cash	(8,000)	4,000
Net decrease in cash and cash equivalents	(7,635,000)	(6,701,000)
Cash and cash equivalents at beginning of period	24,261,000	23,560,000
Cash and cash equivalents at end of period	16,626,000	16,859,000
Non-cash investing activity
Finished goods inventory transferred to property, plant and equipment	1,551,000
DeltaNu
Investing activities
Proceeds from sale of assets	500,000
Mainframe Technology
Investing activities
Proceeds from sale of assets		$ 3,000,000