STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional paid in capital	Accumulated Deficit
Beginning Balance at Jun. 30, 2018	$ 50,459	$ 70,406	$ 264,858	$ (214,399)
Net loss	(16,819)			(16,819)
Issuance of common stock, net	5,444	2,215	5,444
Exercise of warrants	2,186	440	2,186
Issuance of common stock for vested restricted stock units	(324)	246	(324)
Exercise of stock options	422	238	422
Share-based compensation expense	6,562		6,562
Ending Balance at Jun. 30, 2019	47,930	73,545	279,148	(231,218)
Net loss	(47,173)			(47,173)
Issuance of common stock, net	69,231	37,815	69,231
Exercise of stock options	272	154	272
Share-based compensation expense	6,801		6,801
Ending Balance at Jun. 30, 2020	77,061	111,514	355,452	(278,391)
Net loss	(41,314)			(41,314)
Issuance of common stock, net	3,136	958	3,136
Exercise of warrants	6	1	6
Exercise of stock options	332	142	332
Share-based compensation expense	10,245		10,245
Ending Balance at Jun. 30, 2021	$ 49,466	$ 112,615	$ 369,171	$ (319,705)