CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 4,069	$ 3,928
Accounts receivable, net	3,141	3,390
Inventories	3,009	2,817
Prepaid expenses and other current assets	533	617
Total current assets	10,752	10,752
Property and equipment, net	7,703	10,180
Intangible assets, net	11,325	13,412
Goodwill	8,803	8,803
Other assets	48	46
Total assets	38,631	43,193
Current liabilities:
Note payable	357	339
Current portion of long-term debt	2,387	1,714
Accounts payable	2,277	1,853
Other accrued liabilities	2,360	1,992
Deferred revenues	291	235
Total current liabilities	7,672	6,133
Long-term liabilities:
Long-term debt, net	7,853	9,752
Senior secured convertible debentures, net	0	12,028
Warranty liability	3	105
Deferred tax liability	414	359
Other liabilities	444	97
Total liabilities	16,386	28,474
Commitments and contingencies
Stockholders' equity:
Common Stock, $.001 par value, 150,000,000 shares authorized; 4,304,425 and 2,166,898 shares issued and outstanding as of December 31, 2017 and 2016, respectively	4	2
Additional paid-in capital	251,643	225,289
Accumulated deficit	(229,406)	(210,575)
Accumulated other comprehensive income	0	2
Total stockholders' equity	22,245	14,719
Total liabilities and stockholders' equity	38,631	43,193
Series B Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred Stock	0	1
Series C Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred Stock	$ 4	$ 0