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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net loss $ (9,803) $ (9,037)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation 613 518
Amortization of intangible assets 46 47
Gain on disposal of property and equipment 0 7
Non-cash stock-based compensation expense 373 401
Inventory write-downs 1,094 461
Non-cash deferred rent (44) (69)
Change in:    
Accounts receivable, net 74 236
Costs and estimated earnings in excess of billings on uncompleted contracts 7 14
Inventory 2,041 191
Other current assets (140) 87
Other assets 0 (12)
Accounts payable (792) (985)
Accrued liabilities (106) 142
Billings in excess of costs and estimated earnings on uncompleted contracts 446 (34)
Other long-term liabilities 0 (94)
Net cash used in operating activities (6,191) (8,141)
Cash flows from investing activities    
Sales of investment securities 0 0
Decrease in restricted investment 350 170
Proceeds on sale of property and equipment 0 7
Purchases of property and equipment (393) (64)
Net cash provided by (used in) investing activities (43) 113
Cash flows from financing activities    
Principal payments under capital leases (10) (12)
Principal payments under long-term debt (23) (20)
Net proceeds from issuance of common stock and warrants 0 3,116
Net cash provided by (used in) financing activities (33) 3,084
Net decrease in cash and cash equivalents (6,267) (4,944)
Cash and cash equivalents, at beginning of period 13,075 19,413
Cash and cash equivalents, at end of period 6,808 14,469
Supplemental disclosure of cash flow information    
Cash paid for interest 9 13
Supplemental schedule of non-cash investing and financing activities    
Other non-cash additions to property and equipment $ 86 $ 229