Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 118	$ 0	$ 324	$ 40
Cost of revenue	111	0	307	11
Gross profit	7	0	17	29
Operating expenses:
Selling, general and administrative	1,193	1,238	3,505	3,667
Research and development	814	1,026	2,608	3,027
Total operating expenses	2,007	2,264	6,113	6,694
Loss from operations	(2,000)	(2,264)	(6,096)	(6,665)
Interest and other expense, net	(68)	12	(123)	15
Loss from operations before income taxes	(2,068)	(2,252)	(6,219)	(6,650)
Income tax benefit	0	858	0	858
Net loss	$ (2,068)	$ (1,394)	$ (6,219)	$ (5,792)
Weighted average common shares outstanding:
Basic and diluted	6,107	5,467	5,934	4,734
Basic and diluted net loss per common share:
Net loss	$ (0.34)	$ (0.25)	$ (1.05)	$ (1.22)
Other comprehensive loss, net of tax:
Net loss	$ (2,068)	$ (1,394)	$ (6,219)	$ (5,792)
Available-for-sale securities:
Reclassification adjustment for realized loss	0	0	0	31
Total comprehensive loss	$ (2,068)	$ (1,394)	$ (6,219)	$ (5,761)