Condensed Unaudited Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Cash flows from operating activities:
Net loss	$ (8,937)	$ (9,087)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,129	952
Stock-based compensation	1,750	1,067
Write-down of inventories	96	379
Gain on sale of TowerJazz Semiconductor Ltd. Shares	0	(181)
(Gains) losses on disposal of equipment	(2)	27
Write-off of equipment	5	3
Tax effect on other comprehensive income	0	273
Allowance for doubtful accounts	0	(20)
Changes in operating assets and liabilities:
Accounts receivable	1,514	(3,733)
Inventories	(2,838)	(202)
Other assets	291	350
Trade payables	(2,106)	862
Accrued liabilities	(635)	1,396
Other long-term liabilities	(57)	(27)
Net cash used in operating activities	(9,790)	(7,941)
Cash flows from investing activities:
Capital expenditures for property and equipment	(525)	(1,207)
Proceeds from sale of fixed assets	2	0
Proceeds from sale of TowerJazz Semiconductor Ltd. Shares	0	265
Net cash used in investing activities	(523)	(942)
Cash flows from financing activities:
Payment of debt and capital lease obligations	(268)	(182)
Stock issuance cost	0	(70)
Proceeds from debt obligations	0	1,000
Net proceeds from issuance of common stock	4,334	428
Net cash provided by financing activities	4,066	1,176
Net (decrease) in cash and cash equivalents	(6,247)	(7,707)
Cash and cash equivalents at beginning of period	37,406	22,578
Cash and cash equivalents at end of period	31,159	14,871
Supplemental schedule of non-cash investing and financing activities :
Capital lease obligation to finance capital expenditures	448	194
Purchase of equipment included in accounts payable	$ 33	$ 123