Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (33,453)	$ (44,022)
Depreciation	8,821	11,064
Amortization	51	52
Stock based compensation	4,071	5,288
Marketable securities recovery and accretion	(1,728)	(1,476)
Loss (gain) on disposal or anticipated disposal of equipment	2,044	(175)
Accounts receivable	5,697	(3,736)
Inventories	5,796	(3,895)
Prepaid expenses and other assets	(280)	(1,239)
Accounts payable	(6,869)	1,175
Accrued liabilities and other liabilities	(292)	1,568
Net cash used in operating activities	(16,142)	(35,396)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of plant and equipment	(797)	(5,182)
Proceeds from sale of equipment	1,937	2
Purchases of marketable securities		(8,130)
Proceeds from sale of marketable securities	3,528	30,124
Net cash provided by investing activities	4,668	16,814
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of common stock	10	19,804
Borrowings from credit facility	4,000
Net cash provided by financing activities	4,010	19,804
Net (decrease) increase in cash and cash equivalents	(7,464)	1,222
Cash and cash equivalents at beginning of period	20,947	24,949
Cash and cash equivalents at end of period	$ 13,483	$ 26,171