Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Accounts Payable and Accrued Expenses
Accounts payable, trade	$ 228	$ 294
Lease liability, short-term portion	75	225
Dividends payable, short-term portion	37	53
Unrecognized income from research and development tax credits	20	35
Accrued compensation	287	29
Other accrued expenses	43	167
Total accounts payable and accrued expenses	$ 690	$ 803