BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,408	$ 3,276
Investments	30	30
Trade accounts receivable, less allowance for doubtful accounts of $6 on June 30, 2014 and December 31, 2013	988	52
Other receivables		1
Inventories, net	854	976
Prepaid expenses and other current assets	252	202
Total current assets	4,532	4,537
Equipment and leasehold improvements, net	2,224	2,464
Other assets, net	26	27
Total assets	6,782	7,028
Current liabilities:
Current portion of capital lease obligations	26	31
Accounts payable	641	503
Accrued expenses	345	323
Total current liabilities	1,012	857
Long-term portion of capital lease obligations		10
Long-term deferred rent	627	633
Asset retirement obligations	163	160
Total long-term liabilities	790	803
Stockholders' equity:
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding	0	0
Common stock, $.01 par value, 35,000,000 shares authorized; 28,481,496 shares issued and outstanding on June 30, 2014 and December 31, 2013	285	285
Additional paid-in capital	95,872	95,761
Accumulated deficit	(91,177)	(90,678)
Total stockholders' equity	4,980	5,368
Total liabilities and stockholders' equity	$ 6,782	$ 7,028