Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 19,730	$ 16,249
Short-term marketable securities	24,891	28,035
Accounts receivable, net	18,178	16,905
Inventories	39,965	53,489
Prepaids and other current assets	5,616	4,085
Total current assets	108,380	118,763
Property and equipment, net	20,404	23,122
Long-term marketable securities	23,989	18,888
Other assets	97	102
Total assets	152,870	160,875
Current liabilities:
Accounts payable	13,825	12,983
Accrued liabilities	11,658	11,829
Accrued compensation	4,125	4,542
Customer deposits	0	916
Deferred revenue	10,243	6,131
Total current liabilities	39,851	36,401
Other long-term liabilities	798	943
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value, 5,000 shares authorized at June 28, 2014 and December 28, 2013; no shares issued and outstanding at June 28, 2014 and December 28, 2013
Common stock, $.001 par value, 100,000 shares authorized at June 28, 2014 and December 28, 2013, 33,423 and 32,712 shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	33	33
Additional paid-in capital	353,321	348,684
Accumulated deficit	(240,943)	(224,986)
Accumulated other comprehensive loss	(190)	(200)
Total stockholders' equity	112,221	123,531
Total liabilities and stockholders' equity	$ 152,870	$ 160,875