CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 3,120	$ 3,303
Restricted cash	0	15
Accounts receivable, net of allowance for doubtful accounts of $80 and $45, respectively	3,247	4,068
Inventories, net	4,152	4,128
Prepaid expenses and other current assets	377	465
Total current assets	10,896	11,979
Property and equipment, net	12,818	13,851
Patents and licensed technologies, net	7,003	7,247
Other intangible assets, net	7,770	7,980
Goodwill	8,928	8,928
Other assets	94	94
Total assets	47,509	50,079
Current liabilities:
Note payable	195	299
Accounts payable	3,503	4,446
Other accrued liabilities	1,639	2,161
Deferred revenues	225	173
Total current liabilities	5,562	7,079
Long-term liabilities:
Long-term debt, net	11,344	9,851
Senior secured convertible debentures, net	10,308	9,839
Warrant liability	5,057	7,042
Deferred tax liability	179	119
Other liabilities	27	62
Total liabilities	$ 32,477	$ 33,992
Commitment and contingencies
Stockholders' equity:
Preferred Stock, $.10 par value, 10,000,000 shares authorized; 6,505 shares issued and outstanding	$ 1	$ 1
Common Stock, $.001 par value, 150,000,000 shares authorized; 10,503,393 and 10,283,393 shares issued and outstanding, respectively	11	10
Additional paid-in capital	223,696	223,315
Accumulated deficit	(208,677)	(207,240)
Accumulated other comprehensive income	1	1
Total stockholders' equity	15,032	16,087
Total liabilities and stockholders' equity	$ 47,509	$ 50,079