Stockholders' Equity (Tables)

12 Months Ended

Jun. 30, 2024

Class Of Stock [Line Items]

Summary of Aggregate Information on all Equity Compensation Plans

The following table sets forth the aggregate information on all equity compensation plans as of June 30, 2024:

Plan Category (in thousands, except per share amounts)	Number of shares of common stock to be issued upon exercise of outstanding stock options and rights (a)		Weighted-average exercise price of stock options and rights $		Number of shares of common stock remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Equity compensation plans approved by security holders - 2017 Plan(1)		288	$	21.40		144
Equity compensation plans not approved by security holders - Del Mar (BC) 2013 Amended and Restated Stock Option Plan		—	$	2,060.08		—
Totals		288	$	30.70		144

(1) The Del Mar (BC) 2013 Amended and Restated Stock Option Plan refers to the Company’s previous equity compensation plan.

(2) The balance of 144 shares of common stock available for issuance under the 2017 Plan as of June 30, 2024, is net of stock options previously exercised.

Schedule of Stock Option Expense

The Company has recognized the following amounts as stock option expense for the periods noted:

	Years ended June 30,
	2024 $		2023 $
Research and development		187		451
General and administrative		420		1,039
		607		1,490

Schedule of Unvested Stock Options

The following table sets forth changes in unvested stock options under all plans:

	Number of options (in thousands)			Weighted average exercise price $
Unvested at June 30, 2022		84			51.23
Granted		78			8.79
Vested		(44	)		48.53
Unvested at June 30, 2023		118			24.12
Granted		89			4.66
Vested		(70	)		19.44
Forfeited		(31	)		8.26
Unvested at June 30, 2024		106			15.57

Schedule of Restricted Stock Units

	Number of RSU (in thousands)
Balance – June 30, 2022		—
Issuance		78
Balance – June 30, 2023		78
Vested and converted to common shares		(4	)
Forfeited		(8	)
Balance – June 30, 2024		66

Schedule of Warrants

The following table sets forth changes in outstanding warrants:

	Number of warrants (in thousands)			Weighted average exercise price $
Balance – June 30, 2022		720			49.36
Expiry of 2018 Investor and Agent warrants		(7	)		625.68
Balance – June 30, 2023		713			43.55
Expiry of warrants issued for services		(20	)		71.53
Expiry of 2019 Investor and Agent warrants		(16	)		157.25
Balance – June 30, 2024		677			39.99

Schedule of Changes in Outstanding Warrants

The following table summarizes the Company’s outstanding warrants as of June 30, 2024:

Description of warrants	Number (in thousands)		Exercise price $		Expiry date
2022 April Investor warrants		325		20.50	April 14, 2027
2022 Investor warrants		240		62.50	March 28, 2025
2020 Investor warrants		65		50.00	August 16, 2024
NBTS Warrants		3		54.50	June 19, 2025
2022 April Agent warrants		32		33.12	October 14, 2026
2022 Agent warrants		12		78.12	March 28, 2025
		677

Series C Warrants

Class Of Stock [Line Items]

Schedule of Changes in Outstanding Warrants

The following table summarizes the Company’s outstanding Series C Agent Warrants as of June 30, 2024:

Series C Agent Warrants	Number		Conversion price $		Number of conversion shares (in thousands)		Cumulative common stock dividends (in thousands)
Series 1		1,929		58.00		33		23
Series 2		219		60.70		4		3
Series 3		296		57.50		5		4
		2,444				42		30

Schedule of Conversion of Series C Preferred Stock to Series C Warrants

The following table sets forth changes in outstanding Series C Agent Warrants:

	Balance, June 30, 2023		Number of Warrants Issued		Number of Warrants Exercised		Balance, June 30, 2024		Exercise price $
Issuance of Preferred Series C-1 Agent Warrants		1,929		—		—		1,929		58.00
Issuance of Preferred Series C-2 Agent Warrants		219		—		—		219		60.70
Issuance of Preferred Series C-3 Agent Warrants		296		—		—		296		57.50
		2,444		—		—		2,444

Employee Stock Option

Class Of Stock [Line Items]

Schedule of Outstanding Under the Legacy Plan

The following table sets forth changes in stock options outstanding under all plans:

	Number of stock options outstanding (in thousands)			Weighted average exercise price
Balance – June 30, 2022		176			87.05
Granted		78			8.79
Expired		(56	)		102.65
Balance – June 30, 2023		198			51.71
Granted		89			4.66
Expired		(34	)		107.69
Forfeited		(31	)		8.26
Balance – June 30, 2024		222			30.70

Summary of Stock Options Currently Outstanding and Exercisable

The following table summarizes stock options outstanding and exercisable under all plans at June 30, 2024:

Exercise price $	Number Outstanding at June 30, 2024 (in thousands)		Weighted average remaining contractual life (years)		Number exercisable at June 30, 2024 (in thousands)
4.655		79		9.17		21
6.04		9		8.64		3
8.79		34		8.09		17
12.75 to 16.25		6		8.27		6
30.50 to 48.00		73		7.31		48
62.00 to 68.50		13		6.81		13
85		7		6.21		7
304.95 to 2,660.00		1		1.93		1
		222				116

Schedule of Valuation Assumptions Using a Black-Scholes Pricing Model

Stock options issued during the years ended June 30, 2024, and 2023, have been valued using a Black-Scholes pricing model with the following assumptions:

	June 30, 2024			June 30, 2023
Dividend rate		—	%		—	%
Volatility		91.4	%		91.4	%
Risk-free rate		4.24	%		2.67	%
Term – years		6.1			6.1

Performance stock units [Member]

Class Of Stock [Line Items]

Schedule of Issuance of Series C Preferred Stock

	Series C Preferred Stock
	Number of shares			$ (in thousands)
Balance – June 30, 2022		16,838			12,275
Conversion of Series C Preferred stock to common stock		(2,630	)		(1,909	)
Balance – June 30, 2023		14,208			10,366
Conversion of Series C Preferred stock to common stock		(540	)		(393	)
Balance – June 30, 2024		13,668			9,973

Schedule of Series C Preferred Stock Outstanding, Conversion Shares and Future Dividends

The Company’s Series C Preferred Stock outstanding, conversion shares, and future dividends as of June 30, 2024, are as follows:

Series	Number		Conversion Price $		Number of conversion shares (in thousands)		Dividend Shares (in thousands)
Series 1		10,925		58.00		188		151
Series 2		898		60.70		15		10
Series 3		1,845		57.50		32		24
		13,668				235		185

Series C Dividends	Dividend Shares (in thousands)
10% - August 19, 2021 (actual)		34
15% - August 19, 2022 (actual)		43
20% - August 19, 2023 (actual)		49
25% - August 19, 2024 (actual)		59
		185