Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Cash and cash equivalents	$ 13,075	$ 19,413
Investment securities, available-for-sale	8	13
Accounts receivable, net of allowances of $243 and $588	463	1,116
Costs and estimated earnings in excess of billings on uncompleted contracts	70	137
Inventory	4,254	6,075
Current restricted investments	0	306
Other current assets	785	564
Total current assets	18,655	27,624
Property and equipment, net	2,347	4,169
Restricted investments	786	1,189
Intangible assets	2,048	2,233
Other assets	34	18
Total assets	23,870	35,233
Accounts payable	7,341	7,665
Accrued liabilities	5,113	4,135
Billings in excess of costs and estimated earnings on uncompleted contracts	156	81
Current portion of capital lease obligations	39	40
Current portion of long-term debt	93	85
Total current liabilities	12,742	12,006
Capital lease obligations, net of current portion	72	114
Long-term debt, net of current portion	67	159
Deferred rent, net of current portion	187	697
Other long-term liabilities	0	424
Total liabilities	13,068	13,400
Commitments and contingencies
Preferred stock, par value $.001; 25,000 shares authorized; 0 and 0 shares issued and outstanding	0	0
Common stock, par value $.001; 100,000 shares authorized; 17,019 and 12,809 shares issued and outstanding	17	13
Additional paid-in capital	425,658	400,880
Accumulated other comprehensive loss	(35)	(30)
Accumulated deficit	(414,838)	(379,030)
Total shareholders' equity	10,802	21,833
Total liabilities and shareholders' equity	$ 23,870	$ 35,233