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BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 1,955 $ 1,779
Trade accounts receivable, less allowance for doubtful accounts of $5 on December 31, 2017 and 2016 1,115 434
Inventories, net 1,139 772
Prepaid expenses and other current assets 415 442
Total current assets 4,624 3,427
Equipment and leasehold improvements, net 1,624 1,395
Other assets, net 18 20
Total assets 6,266 4,842
Current liabilities:    
Line of Credit 300 0
Current portion of capital lease obligations 143 107
Accounts payable 1,038 669
Accrued expenses 543 521
Total current liabilities 2,024 1,297
Long-term portion of capital lease obligations 416 110
Long-term deferred rent 410 466
Asset retirement obligations 184 178
Total long-term liabilities 1,010 754
Contingent liabilities  
Stockholders' equity:    
Preferred stock, $.01 par value, 24,088 shares authorized and no shares issued and outstanding
Common stock, $.01 par value, 42,000,000 shares authorized; 33,847,793 and 31,229,996 shares issued and outstanding on December 31, 2017 and December 31, 2016, respectively 338 312
Additional paid-in capital 98,563 97,359
Accumulated deficit (95,669) (94,880)
Total stockholders' equity 3,232 2,791
Total liabilities and stockholders' equity $ 6,266 $ 4,842