CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Cash flows from operating activities:
Net loss	$ (12,852,000)	$ (13,373,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,416,000	1,044,000
Expense related to modification of warrants	151,000
Depreciation expense	38,000	51,000
Amortization expense		22,000
Non-cash interest expense		16,000
Change in fair value of warrant liability	(330,000)	(334,000)
Changes in assets and liabilities:
Accounts receivable	(4,000)
Inventories	23,000	23,000
Prepaid expenses and other assets	(289,000)	(150,000)
Accounts payable	(545,000)	1,058,000
Accrued expenses and other liabilities	528,000	892,000
Net cash used in operating activities	(11,864,000)	(10,751,000)
Cash flows from investing activities:
Purchases of property and equipment	(41,000)	(20,000)
Net cash used in investing activities	(41,000)	(20,000)
Cash flows from financing activities:
Proceeds from the issuance of common stock and warrants, net of issuance costs	6,355,000	5,675,000
Proceeds from exercises of common stock warrants	615,000
Proceeds from exercises of stock options	10,000	41,000
Proceeds from issuance of convertible notes, net		1,484,000
Net cash provided by financing activities	6,980,000	7,200,000
Net decrease in cash and cash equivalents	(4,925,000)	(3,571,000)
Cash and cash equivalents at beginning of period	6,501,000	4,039,000
Cash and cash equivalents at end of period	$ 1,576,000	$ 468,000