v3.24.3

Basis of Presentation (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2024 USD ($) $ / shares shares | Feb. 25, 2024 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 07, 2023 USD ($) shares | Nov. 29, 2023 shares | Sep. 30, 2023 USD ($) $ / shares shares | Aug. 04, 2023 USD ($) shares | Oct. 07, 2022 shares | Aug. 31, 2024 USD ($) shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2022 USD ($)
Net cash used in operating activities |  |  |  |  |  |  |  |  |  | $ 18,554,000 | $ 30,436,000 |
Total current assets |  |  |  |  |  |  |  |  |  | 15,672,000 | 26,259,000 |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | 14,210,000 | 4,301,000 |
Net losses |  |  |  |  |  |  |  |  |  | 24,907,000 | 65,010,000 |
Operating capital deficit |  |  |  |  |  |  |  |  |  | 18,600,000 | 30,400,000 |
Proceeds from offering |  |  |  |  |  |  |  |  |  | $ 25,523,000 | $ 11,487,000 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |
Sale proceeds for intangible assets |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  | 4,464,000 |  |
Total cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  |  | 14,425,000 | $ 7,579,000 | $ 28,672,000
Restricted cash, current |  |  |  |  |  |  |  |  |  |  | $ 3,025,000 |
Pre-split shares required for one post-split share of common stock | shares |  |  |  |  |  |  |  | 25 |  |  |  |
Cash and cash equivalents and marketable securities |  |  |  |  |  |  |  |  |  | $ 14,400,000 |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  | $ 4,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, shares received per share tendered |  |  |  |  | 0.05 |  |  | 0.04 |  |  |  |
Pre-split shares required for one post-split share of common stock | shares |  |  |  |  | 20 |  |  | 25 |  |  |  |
Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised | shares |  |  |  |  |  |  |  |  |  | 1,650,000 |  |
Series C Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised | shares |  |  |  |  |  |  |  |  |  | 1,178,500 |  |
Series C Warrants | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised | shares |  |  |  |  |  |  |  |  | 1,000 |  |  |
Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised | shares |  |  |  |  |  |  |  |  |  | 1,053,500 |  |
Series D Warrants | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised | shares |  |  |  |  |  |  |  |  | 1,000 |  |  |
At-The-Market Offerings |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  |  | 170,989 |  |  |  |  |  |
Proceeds from offering |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |
Lincoln Park Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  | 21,457 |  |  |  | 181,141 |  |  |  |  |
Proceeds from offering |  |  | $ 100,000 |  |  |  | $ 1,200,000 |  |  |  |  |
Offering 2023 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  | 600,000 |  |  |  |  |  |  |  |
Proceeds from offering |  |  |  | $ 4,500,000 |  |  |  |  |  |  |  |
Offering 2023 | Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | shares |  |  |  | 1,650,000 |  |  |  |  |  |  |  |
Warrants, shares of common stock issued upon conversion | shares |  |  |  | 1,650,000 |  |  |  |  |  |  |  |
Offering 2023 | Series C Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | shares |  |  |  | 2,250,000 |  |  |  |  |  |  |  |
Warrants, shares of common stock issued upon conversion | shares |  |  |  | 2,250,000 |  |  |  |  |  |  |  |
Offering 2023 | Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | shares |  |  |  | 2,250,000 |  |  |  |  |  |  |  |
Warrants, shares of common stock issued upon conversion | shares |  |  |  | 2,250,000 |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares | 2,701,315 |  |  |  |  |  |  |  |  |  |  |
Common stock, gross proceeds from issuance | $ 15,100,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, net proceeds from issuance | $ 14,100,000 |  |  |  |  |  |  |  |  |  |  |
Placement agent fees paid (as percentage) | 6.00% |  |  |  |  |  |  |  |  |  |  |
Reduced placement agent fee percentage | 4.00% |  |  |  |  |  |  |  |  |  |  |
Payment made to placement agent for legal fees and other out of pocket expenses | $ 50,000 |  |  |  |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock, net proceeds from issuance |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement | Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |  |
Warrants, shares of common stock issued upon conversion | shares | 2,585,963 |  |  |  |  |  |  |  |  |  |  |
Exercise price per share of warrants | $ / shares | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement | Series E Warrants |  |  |  |  |  |  |  |  |  |  |  |
Warrants, shares of common stock issued upon conversion | shares | 5,287,278 |  |  |  |  |  |  |  |  |  |  |
Exercise price per share of warrants | $ / shares | $ 2.64 |  |  |  |  |  |  |  |  |  |  |
Warrants, exercisable term | 5 years |  |  |  |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement | Common Shares and Series E Warrants |  |  |  |  |  |  |  |  |  |  |  |
Combined purchase price per share | $ / shares | $ 2.85 |  |  |  |  |  |  |  |  |  |  |
2024 Securities Purchase Agreement | Private placement | Pre-funded and Series E Warrants |  |  |  |  |  |  |  |  |  |  |  |
Combined purchase price per share | $ / shares | $ 2.849 |  |  |  |  |  |  |  |  |  |  |
PD-1 Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Sale proceeds for intangible assets |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Potential contingent payment |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Second potential contingent payment |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |

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