Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Cash and cash equivalents	$ 14,764	$ 13,075
Accounts receivable, net of allowances of $368 and $243	558	463
Costs and estimated earnings in excess of billings on uncompleted contracts	12	70
Inventory	866	4,254
Other current assets	501	793
Total current assets	16,701	18,655
Property and equipment, net	1,650	2,347
Restricted investments	436	786
Intangible assets	1,956	2,048
Other assets	22	34
Total assets	20,765	23,870
Accounts payable	4,348	7,341
Accrued liabilities	4,438	5,113
Billings in excess of costs and estimated earnings on uncompleted contracts	187	156
Current portion of capital lease obligations	44	39
Current portion of long-term debt	97	93
Total current liabilities	9,114	12,742
Capital lease obligations, net of current portion	47	72
Long-term debt, net of current portion	17	67
Deferred rent, net of current portion	48	187
Total liabilities	9,226	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; 24,892 and 17,019 shares issued and outstanding	25	17
Additional paid-in capital	441,126	425,658
Accumulated other comprehensive loss	0	(35)
Accumulated deficit	(429,612)	(414,838)
Total shareholders' equity	11,539	10,802
Total liabilities and shareholders' equity	$ 20,765	$ 23,870