Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Cash flows from operating activities:
Net loss	$ (1,119)	$ (6,274)
Adjustments to reconcile net loss to net cash provided by operating activities:
Allowance for doubtful accounts	(117)	177
Depreciation and amortization	882	1,665
Stock-based compensation	405	728
Deferred income taxes	105	0
Other non-cash items	6	0
Changes in assets and liabilities:
Accounts receivable	5,585	5,914
Advance billings	752	(1,636)
Inventories	(1,433)	1,152
Prepaid expenses and other current assets	2,105	1,198
Other assets	17	101
Accounts payable	1,497	(6,154)
Accrued liabilities	(933)	2,343
Deferred revenue	(2,710)	1,272
Income taxes payable, non-current and other liabilities	(88)	(380)
Net cash provided by operating activities	4,954	106
Cash flows from investing activities:
Maturities of available-for-sale investments	0	2,151
Purchases of property and equipment	(421)	(158)
Other	0	(2)
Net cash provided by (used in) investing activities	(421)	1,991
Cash flows from financing activities:
Proceeds from stock plans, net	127	22
Net cash provided by financing activities	127	22
Effect of exchange rate changes on cash and cash equivalents	(175)	1,423
Net increase in cash and cash equivalents	4,485	3,542
Cash and cash equivalents, beginning of period	31,073	16,863
Cash and cash equivalents, end of period	$ 35,558	$ 20,405