Condensed Unaudited 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 loss	$ (2,110)	$ (3,584)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	362	317
Stock-based compensation	732	452
Write-down of inventories	64	343
Gains on disposal of equipment	(2)	0
Allowance for doubtful accounts	0	31
Changes in operating assets and liabilities:
Accounts receivable	(66)	(181)
Inventories	(1,152)	160
Other assets	343	102
Trade payables	(1,172)	(572)
Accrued liabilities	162	77
Other long-term liabilities	(6)	26
Net cash provided by (used for) operating activities	(2,845)	(2,829)
Cash flows from investing activities:
Capital expenditures for property and equipment	(12)	(62)
Proceeds from sale of fixed assets	2	0
Net cash provided by (used for) investing activities	(10)	(62)
Cash flows from financing activities:
Payment of debt and capital lease obligations	0	(35)
Net proceeds from issuance of common stock	2,561	7
Net cash provided by (used for) financing activities	2,561	(28)
Net increase (decrease) in cash and cash equivalents	(294)	(2,919)
Cash and cash equivalents at beginning of period	37,406	22,578
Cash and cash equivalents at end of period	37,112	19,659
Supplemental schedule of non-cash investing and financing activities :
Capital lease obligation to finance capital expenditures	309	374
Purchase of equipment included in accounts payable	$ 79	$ 0