CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Revenues, net	$ 19	$ 33
Cost of goods sold	11	20
Gross margin	8	13
Operating expenses:
Research and development	2,941	2,173
Sales and marketing	797	1,107
General and administrative	1,303	1,193
Total operating expenses	5,041	4,473
Loss from operations	(5,033)	(4,460)
Change in fair value of warrant liability	(364)
Other income	1	1
Loss before income taxes	(5,396)	(4,459)
Provision for income taxes	1	2
Net loss and comprehensive loss	$ (5,397)	$ (4,461)
Basic and diluted net loss per share	$ (0.08)	$ (0.17)
Shares used in computing basic and diluted net loss per share	67,670,000	26,202,000