Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Cash and cash equivalents	$ 6,808	$ 13,075
Investment securities, available-for-sale	13	8
Accounts receivable, net of allowances of $318 and $243	389	463
Costs and estimated earnings in excess of billings on uncompleted contracts	63	70
Inventory	1,119	4,254
Other current assets	925	785
Total current assets	9,317	18,655
Property and equipment, net	1,984	2,347
Restricted investments	436	786
Intangible assets	2,002	2,048
Other assets	34	34
Total assets	13,773	23,870
Accounts payable	6,406	7,341
Accrued liabilities	5,031	5,113
Billings in excess of costs and estimated earnings on uncompleted contracts	602	156
Current portion of capital lease obligations	41	39
Current portion of long-term debt	95	93
Total current liabilities	12,175	12,742
Capital lease obligations, net of current portion	60	72
Long-term debt, net of current portion	42	67
Deferred rent, net of current portion	119	187
Total liabilities	12,396	13,068
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; 17,027 and 17,019 shares issued and outstanding	17	17
Additional paid-in capital	426,031	425,658
Accumulated other comprehensive loss	(30)	(35)
Accumulated deficit	(424,641)	(414,838)
Total shareholders' equity	1,377	10,802
Total liabilities and shareholders' equity	$ 13,773	$ 23,870