Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Operating activities
Net loss	$ (3,161)	$ (7,031)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	1,241	1,388
Net amortization of investment premiums and discounts	395	222
Equity-based compensation	1,054	962
Change in the fair value of acquisition-related contingent consideration	278	300
Deferred income taxes	(3,258)	(2,385)
Gain on sale of mainframe technology	(2,207)
Loss on disposal of equipment		31
Changes in operating assets and liabilities	(196)	(1,070)
Total adjustments	(2,693)	(552)
Net cash and cash equivalents used in operating activities	(5,854)	(7,583)
Investing activities
Purchases of investments	(16,091)	(76,940)
Proceeds from sales and maturities of investments	13,405	1,995
Proceeds from sale of mainframe technology	3,000
Purchases of leasehold improvements and equipment	(852)	(2,617)
Net cash and cash equivalents used in investing activities	(538)	(77,562)
Financing activities
Proceeds from issuance of common stock	863	1,495
Net cash and cash equivalents provided by financing activities	863	1,495
Effect of exchange rate changes on cash and cash equivalents	12	9
Net decrease in cash and cash equivalents	(5,517)	(83,641)
Cash and cash equivalents at beginning of period	23,560	109,520
Cash and cash equivalents at end of period	$ 18,043	$ 25,879