BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,148	$ 3,276
Investments	30	30
Trade accounts receivable, less allowance for doubtful accounts of $6 on March 31, 2014 and December 31, 2013	1,130	52
Other receivables		1
Inventories, net	931	976
Prepaid expenses and other current assets	250	202
Total current assets	4,489	4,537
Equipment and leasehold improvements, net	2,319	2,464
Other assets, net	27	27
Total assets	6,835	7,028
Current liabilities:
Current portion of capital lease obligations	31	31
Accounts payable	754	503
Accrued expenses	259	323
Total current liabilities	1,044	857
Long-term portion of capital lease obligations	3	10
Long-term deferred rent	630	633
Asset retirement obligations	161	160
Total long-term liabilities	794	803
Stockholders' equity:
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding
Common stock, $.01 par value, 35,000,000 shares authorized; 28,481,496 shares issued and outstanding on March 31, 2014 and December 31, 2013	285	285
Additional paid-in capital	95,819	95,761
Accumulated deficit	(91,107)	(90,678)
Total stockholders' equity	4,997	5,368
Total liabilities and stockholders' equity	$ 6,835	$ 7,028