Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income (loss)	$ 4,381	$ (13,075)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	1,378	2,236
Stock-based compensation	685	723
Other non-cash items	93	(456)
Changes in assets and liabilities:
Accounts receivable	1,768	5,167
Advance billings	(493)	(635)
Inventories	(9,279)	(1,126)
Prepaid expenses and other assets	(994)	63
Accounts payable	(6,752)	2,740
Accrued compensation and benefits and other current liabilities	1,582	(4,105)
Deferred revenue	(3,165)	34
Other liabilities	(88)	(175)
Net cash used in operating activities	(10,884)	(8,609)
Cash flows from investing activities:
Increase in restricted cash	(9)	(198)
Purchases of property and equipment	(452)	(538)
Other	10	0
Net cash used in investing activities	(451)	(736)
Cash flows from financing activities:
Proceeds from revolving credit facility, net of borrowing costs	0	9,611
Repayment of revolving credit facility	(14,000)	0
Proceeds from issuance of common stock, net	31,921	260
Net cash provided by financing activities	17,921	9,871
Effect of exchange rate changes on cash and cash equivalents	(497)	44
Net increase in cash and cash equivalents	6,089	570
Cash and cash equivalents, beginning of period	14,578	14,354
Cash and cash equivalents, end of period	$ 20,667	$ 14,924