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, 2018	$ 3,992				$ 190,570	$ (4,128)	$ 1,745	$ (184,164)		$ (31)
Balance (in shares) at Jun. 30, 2018					4,097
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net change in available-for-sale debt and marketable equity securities	31									31
Issuance of shares	5,908				$ 1		5,907
Issuance of shares (in shares)			281	281	1,491
Stock-based compensation	177						177
Cancellation of restricted stock	(14)				$ (14)
Cancellation of restricted stock (in shares)					(25)
Exercise of stock options	7				$ 7
Exercise of stock options (in shares)					3
Share repurchases	(1)					(1)
Restricted stock issuance	142				$ 7		135
Restricted stock issuance (in shares)					209
Net loss	(7,534)							(7,534)
Balance, end 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]	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201602Member
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
Cancellation of restricted stock	(15)						(15)
Cancellation of restricted stock (in shares)					(17)
Forfeiture of stock-based compensation	(3)						(3)
Restricted stock issuance (in shares)					5
Net loss	(8,311)							(8,311)
Balance, end of period at Jun. 30, 2020	$ 625				$ 190,599	$ (4,129)	$ 13,934	$ (199,779)		$ 0
Balance (in shares) at Jun. 30, 2020				281	7,850