Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (13,487)	$ (10,499)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,146	2,760
Stock-based compensation	1,057	1,128
Deferred income taxes	(478)	105
Other non-cash items	118	(71)
Changes in assets and liabilities:
Accounts receivable	(15,079)	14,029
Advance billings	(1,256)	4,247
Inventories	759	(4,345)
Prepaid expenses and other current assets	1,957	3,476
Other assets	60	183
Accounts payable	5,665	(6,065)
Accrued compensation and benefits and other current liabilities	(3,761)	(4,137)
Deferred revenue	(475)	(6,501)
Other liabilities	231	(1,507)
Net cash used in operating activities	(21,543)	(7,197)
Cash flows from investing activities:
Increase in restricted cash	(201)	0
Purchases of property and equipment	(1,126)	(1,249)
Net cash used in investing activities	(1,327)	(1,249)
Cash flows from financing activities:
Proceeds from revolving credit facility, net of borrowing costs	19,610	0
Proceeds from issuance of common stock, net	296	267
Net cash provided by financing activities	19,906	267
Effect of exchange rate changes on cash and cash equivalents	239	223
Net decrease in cash and cash equivalents	(2,725)	(7,956)
Cash and cash equivalents, beginning of period	14,354	31,073
Cash and cash equivalents, end of period	$ 11,629	$ 23,117