Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 1	$ 33
Cost of revenue	0	11
Gross profit	1	22
Operating expenses:
Selling, general and administrative	1,202	1,144
Research and development	855	1,103
Total operating expenses	2,057	2,247
Loss from operations	(2,056)	(2,225)
Interest and other expense, net	(12)	(13)
Loss from operations before income taxes	(2,068)	(2,238)
Income tax benefit	0	0
Net loss	$ (2,068)	$ (2,238)
Weighted average common shares outstanding:
Basic and diluted	5,591	4,073
Basic and diluted net loss per common share:
Net loss	$ (0.37)	$ (0.55)
Other comprehensive loss, net of tax:
Net loss	$ (2,068)	$ (2,238)
Available-for-sale securities:
Reclassification adjustment for realized loss	0	31
Total comprehensive loss	$ (2,068)	$ (2,207)