Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 33	$ 0
Cost of revenue	11	0
Gross profit	22	0
Operating expenses:
Selling, general and administrative	1,144	1,407
Research and development	1,103	1,669
Total operating expenses	2,247	3,076
Loss from operations	(2,225)	(3,076)
Interest and other (expense) income, net	(13)	70
Loss before income taxes	(2,238)	(3,006)
Income tax benefit	0	0
Net loss	$ (2,238)	$ (3,006)
Weighted average common shares outstanding:
Basic and diluted	4,073	4,057
Basic and diluted net loss per common share:
Net loss	$ (0.55)	$ (0.74)
Other comprehensive loss, net of tax:
Net loss	$ (2,238)	$ (3,006)
Available-for-sale securities:
Net unrealized gain		1
Reclassification adjustment for realized loss	31	1
Total comprehensive loss	$ (2,207)	$ (3,004)