CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 4,465	$ 6,501
Accounts receivable, net	2	4
Inventories	20	38
Prepaid expenses and other current assets	469	284
Total current assets	4,956	6,827
Property and equipment, net	124	120
Other assets	154	154
Total assets	5,234	7,101
Current liabilities:
Accounts payable	2,370	2,551
Accrued expenses and other current liabilities	1,473	1,176
Total current liabilities	3,843	3,727
Long-term liabilities:
Warrant liability	242	403
Total liabilities	4,085	4,130
Commitments and contingencies (Note 5)
Stockholders' equity
Series A convertible preferred stock, $0.001 par value; 10,000,000 shares authorized; 1,515 issued and outstanding as of July 31, 2017 and January 31, 2017	1,515	1,515
Common stock, $0.001 par value; 450,000,000 shares authorized; 79,669,835 and 67,719,577 shares issued and outstanding as of July 31, 2017 and January 31, 2017, respectively	80	68
Additional paid-in capital	53,330	46,026
Accumulated deficit	(53,776)	(44,638)
Total stockholders' equity	1,149	2,971
Total liabilities and stockholders' equity	$ 5,234	$ 7,101

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).

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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.