CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Revenues, net	$ 57	$ 73
Cost of goods sold	83	250
Gross margin	(26)	(177)
Operating expenses:
Research and development	9,079	9,140
Sales and marketing	2,157	2,415
General and administrative	5,244	5,144
Total operating expenses	16,480	16,699
Loss from operations	(16,506)	(16,876)
Change in fair value of warrant liability	28	364
Other expense, net	(778)	(126)
Loss before provision for income taxes	(17,256)	(16,638)
Provision for income taxes	2	2
Net loss and comprehensive loss	$ (17,258)	$ (16,640)
Basic and diluted net loss per share	$ (0.09)	$ (0.19)
Shares used in computing basic and diluted net loss per share	193,178,000	85,900,000