CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 1,194	$ 1,345
Trade accounts receivable, less allowance for doubtful accounts of $9 and $9 on December 31, 2019 and 2018 respectively	970	829
Inventories, net	2,554	2,242
Prepaid expenses and other current assets	267	273
Total current assets	4,985	4,689
Equipment and leasehold improvements, net	2,255	1,865
Operating leases, Right of Use	2,119
Other assets, net	13	15
Total assets	9,372	6,569
Current liabilities:
Line of credit, bank	500
Line of credit, related party	224	832
Current portion of long-term debt, related party	500
Current portion of capital lease obligations	218	218
Current portion of operating lease obligations	357
Accounts payable	1,748	1,608
Current portion of deferred revenue	482	8
Accrued expenses	380	971
Total current liabilities	4,409	3,637
Long-term portion of capital lease obligations	288	506
Long-term portion of operating lease obligations	2,035
Long-term convertible loan, related party	830
Long-term portion of related party loan		500
Long-term deferred rent		344
Long-term portion of deferred revenue	93
Asset retirement obligations	206	198
Total long-term liabilities	3,452	1,548
Contingent liabilities
Stockholders' equity:
Preferred stock, $.01 par value, 24,088 shares authorized, and no shares issued and outstanding
Common stock, $.01 par value, 55,000,000 shares authorized; 38,136,792 and 33,911,792 shares issued and outstanding on December 31, 2019 and December 31, 2018, respectively	381	339
Additional paid-in capital	101,886	98,795
Accumulated deficit	(100,756)	(97,750)
Total stockholders' equity	1,511	1,384
Total liabilities and stockholders' equity	$ 9,372	$ 6,569