BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,190	$ 1,955
Trade accounts receivable, less allowance for doubtful accounts of $5 on March 31, 2018 and December 31, 2017	1,377	1,115
Inventories, net	1,220	1,385
Prepaid expenses and other current assets	230	169
Total current assets	4,017	4,624
Equipment and leasehold improvements, net	1,577	1,624
Other assets, net	17	18
Total assets	5,611	6,266
Current liabilities:
Line of Credit	200	300
Current portion of capital lease obligations	140	143
Accounts payable	1,210	1,038
Accrued expenses	753	543
Total current liabilities	2,303	2,024
Long-term portion of capital lease obligations	377	416
Long-term deferred rent	394	410
Asset retirement obligations	186	184
Total long-term liabilities	957	1,010
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 shares issued and outstanding on March 31, 2018 and December 31, 2017	338	338
Additional paid-in capital	98,606	98,563
Accumulated deficit	(96,593)	(95,669)
Total stockholders' equity	2,351	3,232
Total liabilities and stockholders' equity	$ 5,611	$ 6,266

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.