Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 5,724	$ 2,372
Accounts receivable, net of allowance for doubtful accounts of $233 and $245	1,437	1,262
Supplies	441	465
Prepaid expenses and other assets	180	138
Total current assets	7,782	4,237
Property and equipment, net	577	666
Investments in unconsolidated subsidiaries and other	211	211
Patents and licenses, net	33	66
Total assets	8,603	5,180
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable, accrued expenses and other	1,373	1,222
Current portion, capital lease obligations	212	253
Warrants, net of $0 and $280 in issuance costs	1,209	4,204
Total current liabilities	2,794	5,679
Capital lease obligations, net of current portion	140	226
Total liabilities	2,934	5,905
Commitments and contingencies (Note 5)
Convertible preferred stock
Common stock; $0.001 par value; 25 million shares authorized; 3,885,822 and 1,511,133 shares issued and outstanding	4	2
Additional paid-in capital	75,948	67,106
Accumulated net losses	(70,283)	(68,227)
Total stockholders' equity (deficit)	5,669	(1,119)
Total liabilities and stockholders' equity (deficit)	8,603	5,180
Series A Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Convertible preferred stock	0	394
Series B Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Convertible preferred stock	0	0
Series C Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Convertible preferred stock	$ 0	$ 0