CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net loss	$ (3,623)	$ (4,402)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	191	593
Depreciation expense	14	16
Change in fair value of warrant liability	(9)	66
Changes in assets and liabilities:
Prepaid expenses and other assets	66	51
Accounts payable	(178)	416
Accrued expenses and other liabilities	206	(344)
Net cash used in operating activities	(3,333)	(3,604)
Cash flows from investing activities:
Purchases of property and equipment	(6)	(4)
Net cash used in investing activities	(6)	(4)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net of issuance costs	3,554
Proceeds from exercises of common stock warrants		6,961
Proceeds from exercises of stock options	4	1
Payments on financing lease obligation	(5)	(4)
Net cash provided by financing activities	3,553	6,958
Net increase in cash and cash equivalents	214	3,350
Cash and cash equivalents as of beginning of period	3,069	7,576
Cash and cash equivalents as of end of period	$ 3,283	$ 10,926