Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,172	$ 10,761
Trade accounts receivable, less allowances of $20 and $42, respectively	3,551	3,595
Inventories, net	5,608	5,718
Prepaid and other current assets	886	596
Assets held for sale	0	225
Total current assets	20,217	20,895
Property and equipment, net	1,004	1,097
Other assets	144	159
Total assets	21,365	22,151
Current liabilities:
Accounts payable	3,076	1,630
Accrued liabilities	145	130
Accrued payroll and related benefits	440	394
Accrued sales commissions	178	124
Accrued restructuring	91	170
Accrued warranty reserve	141	174
Deferred revenue	27	5
Total current liabilities	4,098	2,627
Other liabilities	201	232
Total liabilities	4,299	2,859
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.0001 per share: Authorized: 2,000,000 shares in 2017 and 2016, Issued and outstanding: no shares in 2016 and 2015	0	0
Common stock, par value $0.0001 per share: Authorized: 30,000,000 shares in 2017 and 2016, Issued and outstanding: 11,690,030 at September 30, 2016 and 11,648,978 at December 31, 2015	1	1
Additional paid-in capital	127,656	127,493
Accumulated other comprehensive income	3	2
Accumulated deficit	(110,594)	(108,204)
Total stockholders' equity	17,066	19,292
Total liabilities and stockholders' equity	$ 21,365	$ 22,151

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.