Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012
Cash flows from operating activities:
Net loss	$ (13,075)	$ (4,465)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,236	1,781
Stock-based compensation	723	757
Deferred income taxes	(509)	117
Other non-cash items	53	(65)
Changes in assets and liabilities:
Accounts receivable	5,167	6,391
Advance billings	(635)	2,653
Inventories	(1,126)	(5,778)
Prepaid expenses and other current assets	17	2,225
Other assets	46	177
Accounts payable	2,740	(1,188)
Accrued compensation and benefits and other current liabilities	(4,105)	(1,579)
Deferred revenue	34	(1,794)
Other liabilities	(175)	(974)
Net cash used in operating activities	(8,609)	(1,742)
Cash flows from investing activities:
Increase in restricted cash	(198)	0
Purchases of property and equipment	(538)	(731)
Net cash used in investing activities	(736)	(731)
Cash flows from financing activities:
Proceeds from revolving credit facility, net of borrowing costs	9,611	0
Proceeds from issuance of common stock, net	260	242
Net cash provided by financing activities	9,871	242
Effect of exchange rate changes on cash and cash equivalents	44	28
Net increase (decrease) in cash and cash equivalents	570	(2,203)
Cash and cash equivalents, beginning of period	14,354
Cash and cash equivalents, end of period	$ 14,924	$ 28,870