CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Revenues, net	$ 18	$ 19
Cost of goods sold	7	11
Gross margin	11	8
Operating expenses:
Research and development	2,327	2,941
Sales and marketing	601	797
General and administrative	1,446	1,303
Total operating expenses	4,374	5,041
Loss from operations	(4,363)	(5,033)
Change in fair value of warrant liability	(66)	(364)
Other income, net	29	1
Loss before provision for income taxes	(4,400)	(5,396)
Provision for income taxes	2	1
Net loss and comprehensive loss	$ (4,402)	$ (5,397)
Basic and diluted net loss per share	$ (0.02)	$ (0.08)
Shares used in computing basic and diluted net loss per share	179,713,000	67,670,000