Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 6,003	$ 6,850
Accounts receivable, net of allowance of $347 and $332	1,088	1,115
Costs and estimated earnings in excess of billings on uncompleted contracts	12	12
Inventory	44	497
Other current assets	305	1,221
Total current assets	7,452	9,695
Property and equipment, net	1,191	1,205
Restricted cash	435	436
Intangible assets	1,501	1,580
Other assets	18	22
Total assets	10,597	12,938
Accounts payable	2,106	3,035
Accrued liabilities	3,253	4,007
Deferred revenue	28	609
Billings in excess of costs and estimated earnings on uncompleted contracts	863	98
Warrant liability	3,755	0
Current portion of capital lease obligations	43	48
Current portion of long-term debt	17	67
Total current liabilities	10,065	7,864
Capital lease obligations, net of current portion	0	20
Deferred rent, net of current portion	330	0
Total liabilities	10,395	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; 27,925 and 25,237 shares issued and outstanding	28	25
Additional paid-in capital	444,795	442,560
Accumulated deficit	(444,621)	(437,531)
Total shareholders' equity	202	5,054
Total liabilities and shareholders' equity	$ 10,597	$ 12,938