Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (2,530)	$ (2,029)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	387	359
Depreciation and amortization	89	39
Changes in assets and liabilities:
Accounts receivable	18	(201)
Cost and estimated revenue in excess of billings	2	0
Inventory, net	52	(195)
Accounts payable	118	(282)
Income tax payable	(1)	0
Other assets and liabilities	(576)	123
Net cash used in operating activities	(2,441)	(2,186)
Cash flows from investing activities:
Purchase of investments	(4,855)	0
Purchases of property and equipment	(346)	(97)
Net cash used in investing activities	(5,201)	(97)
Cash flows from financing activities:
Repayment of related party debt	(500)	(2,000)
Repayments on lease financing	(38)	(3)
Net cash used in financing activities	(538)	(2,003)
Net change in cash and cash equivalents	(8,180)	(4,286)
Cash and cash equivalents at beginning of period	26,453	35,936
Cash and cash equivalents at end of period	18,273	31,650
Supplemental disclosures of cash flow information:
Cash paid for interest	59	502
Income taxes paid	$ 1	$ 0