CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Cash flows from operating activities:
Net loss	$ (18,406)	$ (15,598)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,491	1,214
Expense related to modification of warrants		436
Depreciation expense	141	56
Amortization expense	119	30
Non-cash interest expense	145
Change in fair value of warrant liability	(163)
Changes in assets and liabilities:
Accounts receivable	3	(6)
Inventories	62	60
Prepaid expenses and other assets	(68)	(46)
Accounts payable	774	625
Accrued expenses and other liabilities	381	608
Related party payables	(225)	7
Net cash used in operating activities	(15,746)	(12,614)
Cash flows from investing activities:
Purchases of property and equipment	(45)	(38)
Net cash used in investing activities	(45)	(38)
Cash flows from financing activities:
Proceeds from the issuance of common stock, preferred stock and warrants, net of issuance costs	16,712	13,316
Proceeds from exercises of stock options	41	83
Proceeds from exercises of common stock warrants		1,487
Proceeds from issuance of convertible notes, net	1,500	500
Net cash provided by financing activities	18,253	15,386
Net increase in cash and cash equivalents	2,462	2,734
Cash and cash equivalents at beginning of period	4,039	1,305
Cash and cash equivalents at end of period	6,501	4,039
Non-cash investing and financing activities:
Conversion of preferred stock to common stock		7,226
Conversion of convertible notes payable and accrued interest to common stock	1,645
Fair value of beneficial conversion feature issued in connection with convertible notes	88
Deemed dividend on Series A convertible preferred stock	126
Supplemental disclosures:
Income taxes paid	$ 2	$ 4