Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net loss	$ (18,619)	$ (26,002)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation	1,142	1,941
Amortization of intangible assets	138	139
Gain on disposal of property and equipment	(47)	(11)
Realizeld loss on sale of short-term investments	32	0
Non-cash stock-based compensation expense	1,730	2,759
Inventory write-downs	1,094	944
Non-cash deferred rent	(118)	(297)
Change in:
Accounts receivable, net	(516)	239
Costs and estimated earnings in excess of billings on uncompleted contracts	58	(120)
Inventory	2,538	688
Other current assets	183	(344)
Other assets	12	(12)
Accounts payable	(3,413)	(1,518)
Accrued liabilities	(1,095)	150
Billings in excess of costs and estimated earnings on uncompleted contracts	(70)	(31)
Other long-term liabilities	0	(330)
Net cash used in operating activities	(16,951)	(21,805)
Cash flows from investing activities
Sales of investment securities	11	0
Decrease in restricted cash	350	476
Proceeds on sale of property and equipment	47	11
Purchases of property and equipment	(478)	(492)
Net cash used in investing activities	(70)	(5)
Cash flows from financing activities
Principal payments under capital leases and long-term debt	(100)	(92)
Net proceeds from issuance of common stock and warrants	14,789	11,858
Net cash provided by financing activities	14,689	11,766
Net increase (decrease) in cash and cash equivalents	(2,332)	(10,044)
Cash and cash equivalents, at beginning of period	13,075	19,413
Cash and cash equivalents, at end of period	10,743	9,369
Supplemental disclosure of cash flow information
Cash paid for interest	24	34
Supplemental schedule of non-cash investing and financing activities
Other non-cash additions to property and equipment	11	211
Issuance of common stock for prepayment of salaries	$ 0	$ 212