Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 112,659	$ 105,451
Marketable securities	207,807	224,090
Accounts receivable, net of allowance for doubtful accounts of $0 at both March 30, 2012 and December 31, 2011	32,629	53,126
Inventory	17,683	15,434
Deferred income taxes	456	486
Other current assets	18,239	12,246
Total current assets	389,473	410,833
Property and equipment, net	21,555	22,084
Intangible assets, net	1,100	1,200
Goodwill	5,062	5,062
Investments	58,584	55,427
Deferred income taxes	1,159	1,137
Other assets	13,898	8,972
Total assets	490,831	504,715
Current liabilities:
Accounts payable	7,861	12,754
Accrued expenses	17,595	21,620
Current portion of deferred revenue	37,941	38,565
Current portion of long-term liabilities	1,252	1,275
Total current liabilities	64,649	74,214
Deferred revenue	11,281	11,601
Long-term liabilities	3,432	3,599
Total liabilities	79,362	89,414
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized, none issued and outstanding
Common stock, $0.001 par value; 600,000,000 shares authorized; 279,893,911 shares issued and outstanding at March 30, 2012 and 279,318,396 shares issued and outstanding at December 31, 2011	280	279
Additional paid-in capital	1,313,070	1,309,919
Accumulated deficit	(908,642)	(902,204)
Accumulated other comprehensive income	6,761	7,307
Total stockholders' equity	411,469	415,301
Total liabilities and stockholders' equity	$ 490,831	$ 504,715