CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities:
Net loss	$ (4,402)	$ (5,397)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	593	385
Depreciation expense	16	12
Change in fair value of warrant liability	66	364
Changes in assets and liabilities:
Accounts receivable	2	1
Inventories	4	8
Prepaid expenses and other assets	45	44
Accounts payable	416	(243)
Accrued expenses and other liabilities	(344)	600
Net cash used in operating activities	(3,604)	(4,226)
Cash flows from investing activities:
Purchases of property and equipment	(4)	(10)
Net cash used in investing activities	(4)	(10)
Cash flows from financing activities:
Proceeds from the issuance of common stock, preferred stock and warrants, net of issuance costs		4,444
Proceeds from exercises of common stock warrants	6,961
Proceeds from exercises of stock options	1
Payments on capital lease obligations	(4)
Net cash provided by financing activities	6,958	4,444
Net decrease in cash and cash equivalents	3,350	208
Cash and cash equivalents at beginning of period	7,576	6,501
Cash and cash equivalents at end of period	$ 10,926	$ 6,709

Represents the change in fair value of warrant liability during the period.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

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