Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 127	$ 86
Cost of revenue	90	36
Gross profit	37	50
Operating expenses:
Selling, general and administrative	4,876	5,629
Research and development	3,578	6,065
Loss on impairment of long-lived assets	0	1,693
Total operating expenses	8,454	13,387
Loss from operations	(8,417)	(13,337)
Interest and other income, net	25	86
Loss from operations before income taxes	(8,392)	(13,251)
Income tax benefit	858	0
Net loss	$ (7,534)	$ (13,251)
Weighted average common shares outstanding:
Basic and diluted	4,940	4,061
Basic and diluted net loss per common share:
Net loss	$ (1.53)	$ (3.26)
Other comprehensive loss, net of tax:
Net loss	$ (7,534)	$ (13,251)
Available-for-sale securities
Net unrealized losses, net of zero tax expense	0	(94)
Reclassification adjustment for realized losses included in net loss, net of zero tax expense	31	124
Total comprehensive loss	$ (7,503)	$ (13,221)