Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (8,311)	$ (7,534)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	348	305
Depreciation and amortization	533	268
Deferred income tax benefit	0	(429)
Net loss on sale of available-for-sale investments	0	31
Changes in assets and liabilities:
Accounts receivable	(98)	9
Inventory, net	(345)	(324)
Income tax receivable	0	(429)
Other assets and liabilities	863	(420)
Accounts payable	79	48
Net cash used in operating activities	(6,931)	(8,475)
Cash flows from investing activities:
Proceeds from sale of available-for-sale investments	0	3,345
Proceeds from maturities of securities	0	250
Proceeds from sale of property and equipment	0	2
Net cash provided by investing activities	0	3,597
Cash flows from financing activities:
Payments for purchase of treasury stock	0	(1)
Proceeds from exercise of stock options	0	7
Proceeds from related party	2,500	0
Proceeds from term note payable	542	0
Proceeds from issuance of stock, net of offering issuance costs	5,650	5,908
Net cash provided by financing activities	8,692	5,914
Net change in cash and cash equivalents	1,761	1,036
Cash and cash equivalents at beginning of period	1,588	552
Cash and cash equivalents at end of period	3,349	1,588
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Operating right-of-use assets and associated liabilities	$ 1,608	0
Adjustment to Opening Retained Earnings Related to Adoption ASC Topic 842
Supplemental disclosures of cash flow information:
Impact to retained earnings from adoption of ASC Topic 842	$ 230	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member