Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (8,330)	$ (7,603)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	1,535	626
Depreciation and amortization	236	203
Gain from extinguishment of debt - PPP loan	0	(542)
Loss on impairment of long-lived assets	0	173
Changes in assets and liabilities:
Accounts receivable	(51)	96
Cost and estimated revenue in excess of billings	(2)	0
Inventory, net	(18)	(824)
Income tax receivable	0	429
Accounts payable	(227)	157
Other assets and liabilities	65	(113)
Net cash used in operating activities	(6,792)	(7,398)
Cash flows from investing activities:
Purchases of security investments	0	(27,374)
Purchases of property and equipment	(596)	(211)
Net cash used in investing activities	(596)	(27,585)
Cash flows from financing activities:
Repayment of related party debt	(2,000)	0
Repayments on lease financing	(95)	(12)
Proceeds from issuance of stock, net of offering issuance costs	0	67,582
Net cash (used in) provided by financing activities	(2,095)	67,570
Net change in cash and cash equivalents	(9,483)	32,587
Cash and cash equivalents at beginning of period	35,936	3,349
Cash and cash equivalents at end of period	26,453	35,936
Supplemental disclosures of cash flow information:
Cash paid for interest	515	3
Acquisition of equipment through finance lease	394	0
Operating right-of-use assets and associated liabilities	$ 0	$ 246