Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,718	$ 1,275
Trade accounts receivable, less allowance for doubtful accounts of $6 on September 30, 2016 and December 31, 2015	1,304	507
Inventories, net	659	662
Prepaid expenses and other current assets	349	247
Total current assets	4,030	2,691
Equipment and leasehold improvements, net	1,473	1,861
Other assets, net	21	22
Total assets	5,524	4,574
Current liabilities:
Current portion of capital lease obligations	98	94
Accounts payable	649	508
Accrued expenses	625	276
Total current liabilities	1,372	878
Long-term portion of capital lease obligations	70	144
Long-term deferred rent	482	519
Asset retirement obligations	177	172
Total long-term liabilities	729	835
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 and 35,000,000 shares authorized; 31,229,996 and 28,585,496 shares issued and outstanding on September 30, 2016 and December 31, 2015	312	286
Additional paid-in capital	97,281	96,172
Accumulated deficit	(94,170)	(93,597)
Total stockholders' equity	3,423	2,861
Total liabilities and stockholders' equity	$ 5,524	$ 4,574

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.