CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 10,926	$ 7,576
Accounts receivable, net	5	7
Inventories	6	10
Prepaid expenses and other current assets	343	388
Total current assets	11,280	7,981
Property and equipment, net	158	109
Total assets	11,438	8,090
Current liabilities:
Accounts payable	1,792	1,376
Accrued expenses and other current liabilities	1,277	1,603
Total current liabilities	3,069	2,979
Long-term liabilities:
Long-term liabilities	142	39
Total liabilities	3,211	3,018
Commitments and contingencies (Note 5)
Stockholders’ equity:
Series A convertible preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding as of April 30, 2018 and January 31, 2018
Common stock, $0.001 par value; 450,000,000 shares authorized; 191,518,731 and 160,062,509 shares issued and outstanding as of April 30, 2018 and January 31, 2018, respectively	192	160
Additional paid-in capital	73,713	66,190
Accumulated deficit	(65,678)	(61,278)
Total stockholders' equity	8,227	5,072
Total liabilities and stockholders' equity	$ 11,438	$ 8,090

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.