Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (8,707)	$ (7,322)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,275	1,147
Depreciation	507	222
Amortization of operating lease right of use assets	107	86
Interest on financing leases	10	12
Changes in assets and liabilities:
Accounts receivable	24	(18)
Contract asset	0	2
Inventory, net	(349)	(239)
Accounts payable	66	105
Income tax payable	1	(2)
Other assets and liabilities	(58)	(247)
Operating lease liabilities	(113)	(86)
Net cash used in operating activities	(7,237)	(6,340)
Cash flows from investing activities:
Purchases of property and equipment	(353)	(1,319)
Net cash provided by (used in) investing activities	1,652	(4,994)
Cash flows from financing activities:
Purchase of treasury shares	0	(69)
Repayment of related-party debt	0	(500)
Repayments on finance lease liabilities	(136)	(115)
Net cash used in financing activities	(136)	(684)
Net change in cash and cash equivalents	(5,721)	(12,018)
Cash and cash equivalents at beginning of period	14,208	26,453
Cash and cash equivalents at end of period	8,487	14,435
Supplemental disclosures of cash flow information:
Cash paid for interest	21	66
Acquisition of equipment through financing lease	0	223
Income taxes paid	2	2
Interest-bearing Time Deposits [Member]
Cash flows from investing activities:
Purchases of short-term investments	0	1,425
Proceeds (or purchases) from short-term investments	$ 2,005	$ (5,100)