CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net loss	$ (9,138,000)	$ (9,495,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	951,000	697,000
Depreciation expense	24,000	33,000
Amortization expense		15,000
Change in fair value of warrant liability	(161,000)
Changes in assets and liabilities:
Accounts receivable	2,000	6,000
Inventories	18,000	(12,000)
Prepaid expenses and other assets	(185,000)	(155,000)
Accounts payable	(181,000)	1,639,000
Accrued expenses and other liabilities	297,000	82,000
Net cash used in operating activities	(8,373,000)	(7,190,000)
Cash flows from investing activities:
Purchases of property and equipment	(28,000)	(21,000)
Net cash used in investing activities	(28,000)	(21,000)
Cash flows from financing activities:
Proceeds from the issuance of common stock and warrants, net of issuance costs	6,355,000	3,583,000
Proceeds from exercises of stock options	10,000	25,000
Net cash provided by financing activities	6,365,000	3,608,000
Net decrease in cash and cash equivalents	(2,036,000)	(3,603,000)
Cash and cash equivalents at beginning of period	6,501,000	4,039,000
Cash and cash equivalents at end of period	$ 4,465,000	$ 436,000