Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 3,310	$ 6,850
Accounts receivable, net of allowance of $340 and $332	1,506	1,115
Costs and estimated earnings in excess of billings on uncompleted contracts	12	12
Inventory	217	497
Other current assets	699	1,221
Total current assets	5,744	9,695
Property and equipment, net	1,003	1,205
Restricted cash	435	436
Intangible assets	1,540	1,580
Other assets	18	22
Total assets	8,740	12,938
Accounts payable	2,314	3,035
Accrued liabilities	3,501	4,007
Deferred revenue	363	609
Billings in excess of costs and estimated earnings on uncompleted contracts	692	98
Current portion of capital lease obligations	51	48
Current portion of long-term debt	42	67
Total current liabilities	6,963	7,864
Capital lease obligations, net of current portion	5	20
Total liabilities	6,968	7,884
Commitments and contingencies (Note 7)
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; 25,253 and 25,237 shares issued and outstanding	25	25
Additional paid-in capital	442,932	442,560
Accumulated deficit	(441,185)	(437,531)
Total shareholders' equity	1,772	5,054
Total liabilities and shareholders' equity	$ 8,740	$ 12,938