Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net loss	$ (14,774)	$ (18,212)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation	880	1,091
Amortization of intangible assets	92	93
Gain on disposal of property and equipment	(1)	(7)
Realizeld loss on sale of short-term investments	32	0
Non-cash stock-based compensation expense	854	1,798
Inventory write-downs	1,094	944
Non-cash deferred rent	(88)	(138)
Change in:
Accounts receivable, net	(95)	432
Costs and estimated earnings in excess of billings on uncompleted contracts	58	5
Inventory	2,294	89
Other current assets	301	34
Other assets	12	(12)
Accounts payable	(2,976)	(1,020)
Accrued liabilities	(726)	(171)
Billings in excess of costs and estimated earnings on uncompleted contracts	31	(34)
Other long-term liabilities	0	(424)
Net cash used in operating activities	(13,012)	(15,532)
Cash flows from investing activities
Sales of investment securities	11	0
Decrease in restricted investment	350	170
Proceeds on sale of property and equipment	1	7
Purchases of property and equipment	(400)	(195)
Net cash provided by (used in) investing activities	(38)	(18)
Cash flows from financing activities
Principal payments under capital leases and long-term debt	(66)	(66)
Net proceeds from issuance of common stock and warrants	14,805	5,542
Net cash provided by (used in) financing activities	14,739	5,476
Net increase (decrease) in cash and cash equivalents	1,689	(10,074)
Cash and cash equivalents, at beginning of period	13,075	19,413
Cash and cash equivalents, at end of period	14,764	9,339
Supplemental disclosure of cash flow information
Cash paid for interest	17	25
Supplemental schedule of non-cash investing and financing activities
Other non-cash additions to property and equipment	12	208
Issuance of common stock for prepayment of salaries	$ 0	$ 448