Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 6,850	$ 13,075
Accounts receivable, net of allowances of $332 and $243	1,115	463
Costs and estimated earnings in excess of billings on uncompleted contracts	12	70
Inventory	497	4,254
Other current assets	1,221	793
Total current assets	9,695	18,655
Property and equipment, net	1,205	2,347
Restricted cash	436	786
Intangible assets	1,580	2,048
Other assets	22	34
Total assets	12,938	23,870
Accounts payable	3,035	7,341
Accrued liabilities	4,007	5,113
Deferred revenue	609	0
Billings in excess of costs and estimated earnings on uncompleted contracts	98	156
Current portion of capital lease obligations	48	39
Current portion of long-term debt	67	93
Total current liabilities	7,864	12,742
Capital lease obligations, net of current portion	20	72
Long-term debt, net of current portion	0	67
Deferred rent, net of current portion	0	187
Total liabilities	7,884	13,068
Commitments and contingencies (Note 13)
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; 25,237 and 17,019 shares issued and outstanding at December 31, 2012 and 2011, respectively	25	17
Additional paid-in capital	442,560	425,658
Accumulated other comprehensive loss	0	(35)
Accumulated deficit	(437,531)	(414,838)
Total shareholders' equity	5,054	10,802
Total liabilities and shareholders' equity	$ 12,938	$ 23,870