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Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 1,275 $ 1,862
Trade accounts receivable, less allowance for doubtful accounts of $6 on December 31, 2015 and 2014 507 388
Inventories, net 662 950
Prepaid expenses and other current assets 247 367
Total current assets 2,691 3,567
Equipment and leasehold improvements, net 1,861 2,138
Other assets, net 22 25
Total assets 4,574 5,730
Current liabilities:    
Current portion of capital lease obligations 94 70
Accounts payable 508 493
Accrued expenses 276 413
Total current liabilities 878 976
Long-term portion of capital lease obligations 144 121
Long-term deferred rent 519 621
Asset retirement obligations 172 166
Total long-term liabilities $ 835 $ 908
Contingent liabilities
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; 28,585,496 and 28,516,163 shares issued and outstanding on December 31, 2015 and December 31, 2014, respectively $ 286 $ 285
Additional paid-in capital 96,172 95,966
Accumulated deficit (93,597) (92,405)
Total stockholders' equity 2,861 3,846
Total liabilities and stockholders' equity $ 4,574 $ 5,730