Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Adjustment to Opening Retained Earnings Related to Adoption ASC Topic 842	Preferred Stock Class C	Preferred Stock Class D	Common Stock	Treasury Stock Amount	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Adjustment to Opening Retained Earnings Related to Adoption ASC Topic 842	Accumulated Other Comprehensive Loss
Balance, beginning of period at Jun. 30, 2019	$ 2,708	$ 230			$ 190,571	$ (4,129)	$ 7,964	$ (191,698)	$ 230
Balance (in shares) at Jun. 30, 2019			281	281	5,775
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	ASU 2016-02	ASU 2016-02
Conversion of preferred shares (in shares)			(281)		281
Issuance of shares	$ 5,650				$ 2		5,648
Issuance of shares (in shares)					1,806
Stock-based compensation	366				$ 26		340
Stock-based compensation (in shares)					5
Cancellation of restricted stock	(15)						(15)
Cancellation of restricted stock (in shares)					(17)
Forfeiture of stock-based compensation	(3)						(3)
Net loss	(8,311)							(8,311)
Balance, end of period at Jun. 30, 2020	625				$ 190,599	(4,129)	13,934	(199,779)
Balance (in shares) at Jun. 30, 2020				281	7,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change in available-for-sale marketable securities	(23)									$ (23)
Issuance of shares	67,582				$ 40	$ 4,129	63,413
Issuance of shares (in shares)					39,585
Stock-based compensation	632				$ 2		630
Stock-based compensation (in shares)					2,087
Cancellation of restricted stock	(6)						(6)
Cancellation of restricted stock (in shares)					(71)
Net loss	(7,603)							(7,603)
Balance, end of period at Jun. 30, 2021	$ 61,207				$ 190,641		$ 77,971	$ (207,382)		$ (23)
Balance (in shares) at Jun. 30, 2021				281	49,451