BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,527	$ 1,779
Trade accounts receivable, less allowance for doubtful accounts of $5 on March 31, 2017 and December 31, 2016	1,340	434
Inventories, net	740	772
Prepaid expenses and other current assets	337	442
Total current assets	3,944	3,427
Equipment and leasehold improvements, net	1,432	1,395
Other assets, net	20	20
Total assets	5,396	4,842
Current liabilities:
Current portion of capital lease obligations	49	107
Accounts payable	936	669
Accrued expenses	623	521
Total current liabilities	1,608	1,297
Long-term portion of capital lease obligations	273	110
Long-term deferred rent	448	466
Asset retirement obligations	180	178
Total long-term liabilities	901	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; 31,234,330 and 31,229,996 shares issued and outstanding on March 31, 2017 and December 31, 2016, respectively	312	312
Additional paid-in capital	97,409	97,359
Accumulated deficit	(94,834)	(94,880)
Total stockholders' equity	2,887	2,791
Total liabilities and stockholders' equity	$ 5,396	$ 4,842

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.