CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Revenues, net		$ 18
Cost of goods sold		7
Gross margin		11
Operating expenses:
Research and development	$ 2,199	2,327
Sales and marketing	264	601
General and administrative	1,177	1,446
Total operating expenses	3,640	4,374
Loss from operations	(3,640)	(4,363)
Change in fair value of warrant liability	9	(66)
Other income, net	10	29
Loss before provision for income taxes	(3,621)	(4,400)
Provision for income taxes	2	2
Net loss and comprehensive loss	$ (3,623)	$ (4,402)
Basic and diluted net loss per share	$ (0.38)	$ (0.61)
Shares used in computing basic and diluted net loss per share	9,433,000	7,189,000