CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Cash flows from operating activities:
Net loss	$ (5,093)	$ (3,638)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	312	365
Shares issued to third parties for services provided	28	0
Stock-based compensation	534	497
Write-down of inventories	3	17
Changes in operating assets and liabilities:
Accounts receivable	46	(132)
Inventories	(455)	1,586
Other assets	240	153
Trade payables	(414)	(876)
Accrued liabilities and deferred revenue	348	253
Other long-term liabilities	(6)	84
Net cash used in operating activities	(4,457)	(1,691)
Cash flows from investing activities:
Capital expenditures for property and equipment	(1,051)	(51)
Net cash used in investing activities	(1,051)	(51)
Cash flows from financing activities:
Payment of debt and capital lease obligations	(75)	(47)
Proceeds from line of credit	1,000	0
Proceeds from issuance of common stock	10,000	0
Stock issuance costs	(1,200)	0
Taxes for net issuance of stock awards	(51)	(46)
Net cash provided by (used in) financing activities	9,674	(93)
Net increase (decrease) in cash and cash equivalents	4,166	(1,835)
Cash and cash equivalents at beginning of period	19,136	30,050
Cash and cash equivalents at end of period	23,302	28,215
Supplemental schedule of non-cash investing and financing activities :
Capital lease obligation to finance capital expenditures	414	369
Purchase of equipment included in accounts payable	$ 385	$ 71