Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 14,011	$ 7,360
Accounts receivable	1,807	593
Inventory	1,413	1,549
Prepaid expenses and other current assets	1,298	1,228
Total current assets	18,529	10,730
Property and equipment, net	445	239
Other assets	133	138
Total assets	19,107	11,107
Current liabilities:
Accounts payable	2,477	1,432
Accrued liabilities	1,978	1,293
Note payable, current portion	865	4,446
Total current liabilities	5,320	7,171
Note payable, noncurrent portion	8,730
Total liabilities	14,050	7,171
Commitments and contingences (Note 6)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of September 30, 2016; no shares issued
Common stock, $0.0001 par value; 75,000,000 shares authorized as of September 30, 2016; 10,648,407 shares issued and outstanding as of September 30, 2016	1	52,447
Additional paid-in capital	67,858
Accumulated deficit	(62,802)	(48,511)
Total stockholders’ equity	5,057	3,936
Total liabilities and stockholders’ equity	$ 19,107	$ 11,107

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.