Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash	$ 1,343	$ 2,358
Accounts receivable, net of allowance for doubtful accounts of $22	3,508	3,622
Inventories, net	8,506	7,826
Prepaid expenses and other current assets	813	648
Total current assets	14,170	14,454
Property, plant and equipment, net	6,955	7,120
Goodwill	7,992	7,992
Other intangible assets, net	6,294	6,591
Other noncurrent assets	32	18
Total assets	35,443	36,175
Current liabilities:
Line of credit	900	2,050
Current portion of notes payable	982	5,775
Accounts payable	3,021	2,144
Accrued expenses	2,777	2,690
Deferred revenue and deferred rent	187	181
Income taxes payable	710	644
Capital lease obligation	3	7
Warrant liability	45	25
Total current liabilities	8,625	13,516
Notes payable, net of current portion	14,749	10,214
Note payable due to related parties	2,100	2,100
Deferred income taxes	368	430
Asset retirement obligation	206	204
Legal obligation	2,781	2,781
Other noncurrent liabilities	69	78
Total liabilities	28,898	29,323
Commitments and contingencies (Note 12)
Stockholders' (deficit) equity:
Series B convertible preferred stock, $0.001 par value; 1,000,000 shares authorized; 1,000 shares issued and outstanding	1,401	1,401
Common stock, $0.001 par value; 150,000,000 shares authorized; 21,400,244 issued and outstanding	21	21
Additional paid-in capital	102,918	103,014
Accumulated deficit	(103,657)	(103,590)
Accumulated other comprehensive loss	(1,002)	(661)
Total stockholders’ (deficit) equity	(319)	185
Total liabilities and stockholders' (deficit) equity	35,443	36,175
Series A Convertible Preferred Stock [Member]
Temporary Equity
Temporary Equity	4,699	4,564
Series C Preferred Stock [Member]
Temporary Equity
Temporary Equity	2,165	2,103
Stockholders' (deficit) equity:
Total stockholders’ (deficit) equity	$ 2,165	$ 2,103