Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 2,465	$ (9,508)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	733	1,129
Stock-based compensation	298	377
Other non-cash items	101	(10)
Changes in assets and liabilities:
Accounts receivable	(10,892)	3,010
Advance billings	(525)	(865)
Inventories	(9,649)	(1,498)
Prepaid expenses and other assets	(3,100)	1,107
Accounts payable	2,674	3,521
Accrued compensation and benefits and other current liabilities	2,900	(1,173)
Deferred revenue	1,629	664
Other liabilities	(95)	(17)
Net cash used in operating activities	(13,461)	(3,263)
Cash flows from investing activities:
Purchases of property and equipment	(403)	(82)
Other	10	0
Net cash used in investing activities	(393)	(82)
Cash flows from financing activities:
Repayment of revolving credit facility	(14,000)	0
Proceeds from issuance of common stock, net	31,126	5
Net cash provided by financing activities	17,126	5
Effect of exchange rate changes on cash and cash equivalents	(507)	(203)
Net increase (decrease) in cash and cash equivalents	2,765	(3,543)
Cash and cash equivalents, beginning of period	14,578	14,354
Cash and cash equivalents, end of period	$ 17,343	$ 10,811