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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (7,603) $ (8,311)
Adjustments to reconcile net loss from operations to net cash used in operating activities:    
Stock-based compensation 626 348
Depreciation and amortization 203 533
Gain from extinguishment of debt - PPP loan (542) 0
Loss on impairment of long-lived assets 173 0
Changes in assets and liabilities:    
Accounts receivable 96 (98)
Inventory, net (824) (345)
Income tax receivable 429 0
Accounts payable 157 79
Other assets and liabilities (125) 863
Net cash used in operating activities (7,410) (6,931)
Cash flows from investing activities:    
Purchases of security investments (27,374) 0
Purchases of property and equipment (211) 0
Net cash used in investing activities (27,585) 0
Cash flows from financing activities:    
Proceeds from related party 0 2,500
Proceeds from term note payable 0 542
Proceeds from issuance of stock, net of offering issuance costs 67,582 5,650
Net cash provided by financing activities 67,582 8,692
Net change in cash and cash equivalents 32,587 1,761
Cash and cash equivalents at beginning of period 3,349 1,588
Cash and cash equivalents at end of period 35,936 3,349
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Income taxes paid 0 $ 0
Accounting Standards Update [Extensible List]   ASU 2016-02
Operating right-of-use assets and associated liabilities 246 $ 1,608
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 $ 0 $ 230
Accounting Standards Update [Extensible List]   ASU 2016-02