Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Cash flows from operating activities:
Net loss	$ (4,465)	$ (11,487)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Allowance for doubtful accounts	(65)	308
Depreciation and amortization	1,781	3,227
Stock-based compensation	757	1,403
Deferred income taxes	117	0
Changes in assets and liabilities:
Accounts receivable	6,391	6,742
Advance billings	2,653	(886)
Inventories	(5,778)	3,794
Prepaid expenses and other current assets	2,225	824
Other assets	177	212
Accounts payable	(1,188)	(5,004)
Accrued liabilities	(1,579)	4,865
Deferred revenue	(1,794)	1,223
Income taxes payable, non-current and other liabilities	(974)	(170)
Net cash provided by (used in) operating activities	(1,742)	5,051
Cash flows from investing activities:
Maturities of available-for-sale investments	0	2,151
Decrease in restricted cash	0	1,196
Purchases of property and equipment	(731)	(496)
Net cash provided by (used in) investing activities	(731)	2,851
Cash flows from financing activities:
Proceeds from stock plans, net	242	13,128
Net cash provided by financing activities	242	13,128
Effect of exchange rate changes on cash and cash equivalents	28	2,152
Net increase (decrease) in cash and cash equivalents	(2,203)	23,182
Cash and cash equivalents, beginning of period	31,073	16,863
Cash and cash equivalents, end of period	$ 28,870	$ 40,045