Stockholders' Equity (Tables)

12 Months Ended

Jun. 30, 2022

Class Of Stock [Line Items]

Schedule of Stock Option Expense

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

	Years ended June 30,
	2022 $		2021 $
Research and development		601		1,478
General and administrative		1,647		3,798
		2,248		5,276

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, 2020		858			0.98
Granted		5,074			1.67
Vested		(2,058	)		1.52
Forfeited		(14	)		1.42
Unvested at June 30, 2021		3,860			1.60
Granted		3,964			0.99
Vested		(2,388	)		1.56
Forfeited		(1,237	)		1.68
Unvested at June 30, 2022		4,199			1.02

Schedule of Warrants

The following table sets forth changes in outstanding warrants:

	Number of warrants (in thousands)			Weighted average exercise price $
Balance – June 30, 2020		10,309			2.71
Issuance of Adgero Warrants		2,314			3.18
Exercise of warrants (ii)		(4,907	)		1.00
Warrants issued for services (i)		600			1.74
Expiry of warrants		(1,342	)		6.00
Balance – June 30, 2021		6,974			3.34
Issuance of 2022 Investor Warrants		12,000			1.25
Issuance of PFW		4,800			0.001
Issuance of 2022 Agent Warrants		600			1.5625
Issuance of 2022 April Investor Warrants		16,226			0.41
Issuance of 2022 April Agent Warrants		1,623			0.6625
Exercise of PFW		(4,800	)		0.001
Exercise of 2020 Investor Warrants		(69	)		1.00
Expiry of warrants (iii)		(1,330	)		8.55
Balance – June 30, 2022		36,024			0.99

i)Warrants issued for services are exercisable at various prices and expire at the various dates noted in the table below.

ii)A total of 4,404 2020 Investor Warrants were exercised at $1.00 per share and 503 warrants issued as either agent warrants or issued for services were exercised on a cashless basis for which 273 common shares were issued.

iii)Expired warrants include: 1,108 Adgero replacement warrants with an exercise price of $3.18, 208 2017 Investor Warrants with an exercise price of $35.00, and 14 2017 Agent Warrants with an exercise price of $40.60.

Schedule of Changes in Outstanding Warrants

The following table summarizes the Company’s outstanding warrants as of June 30, 2022:

Description of warrants	Number (in thousands)		Exercise price $		Expiry date
2022 April Investor warrants		16,226		0.41	April 14, 2027
2022 Investor warrants		12,000		1.25	March 28, 2025
2020 Investor warrants		3,264		1.00	August 16, 2024
2019 Investor warrants		760		3.10	June 5, 2024
2018 Investor warrants		280		12.50	September 22, 2022
NBTS Warrants		125		1.09	June 19, 2025 (i)
Warrants issued for services		6		17.80	January 25, 2023
Warrants issued for services		34		11.70	February 27, 2023
Warrants issued for services		14		9.00	October 11, 2023
Warrants issued for services		280		0.75	November 18, 2023
Warrants issued for services		125		0.64	January 20, 2024
Warrants issued for services		330		1.49	September 22, 2023
Warrants issued for services		50		1.82	November 13, 2023
Warrants issued for services		100		1.47	January 7, 2024
Warrants issued for services		70		2.75	February 17, 2024
Warrants issued for services		50		2.38	February 25, 2024
2022 April Agent warrants		1,623		0.66	October 14, 2026
2022 Agent warrants		600		1.56	March 28, 2025
2019 Agent warrants		47		3.88	June 3, 2024
2018 Agent warrants		40		12.50	September 20, 2022
		36,024

(i)NBTS Warrants were issued with respect to loan proceeds received during the year ended June 30, 2021 (note 7).

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, 2022:

Series C Agent Warrants	Number		Conversion price $		Number of conversion shares (in thousands)		Cumulative common stock dividends (in thousands)
Series 1		1,929		1.16		1,663		1,164
Series 2		219		1.21		180		126
Series 3		296		1.15		257		180
		2,444				2,100		1,470

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, 2021		Number of Warrants Issued		Number of Warrants Exercised		Balance, June 30, 2022		Exercise price $
Issuance of Preferred Series C-1 Agent Warrants		1,929		—		—		1,929		1.16
Issuance of Preferred Series C-2 Agent Warrants		219		—		—		219		1.21
Issuance of Preferred Series C-3 Agent Warrants		296		—		—		296		1.15
		2,444		—		—		2,444

Stock options [Member]

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, 2020		1,559			4.61
Granted		5,074			1.67
Exercised		(195	)		0.61
Forfeited		(32	)		34.88
Expired		(14	)		1.42
Balance – June 30, 2021		6,392			2.26
Granted		3,964			0.99
Expired		(309	)		3.02
Forfeited		(1,237	)		1.68
Balance – June 30, 2022		8,810			1.74

Summary of Stock Options Currently Outstanding and Exercisable

The following table summarizes stock options outstanding and exercisable under all plans at June 30, 2022:

Exercise price $		Number Outstanding at June 30, 2022 (in thousands)		Weighted average remaining contractual life (years)		Number exercisable at June 30, 2022 (in thousands)
	0.33		10		9.72		—
	0.61		816		3.52		799
	0.74		250		7.38		146
	0.96		3,519		9.36		—
	1.24		335		9.24		251
	1.36		300		8.24		175
	1.37		75		8.84		25
	1.70		3,282		3.05		2,992
	6.10		17		6.36		17
	8.70		12		0.65		12
	9.83		83		0.65		83
	10.60		4		5.79		4
	11.70		30		0.66		30
	21.10		7		2.84		7
	29.60		2		2.61		2
	37.60		5		3.62		5
	41.00		4		4.37		4
	42.00		30		1.13		30
	44.80		3		3.62		3
	49.50		13		4.64		13
	53.20		8		3.85		8
	61.60		2		0.75		2
	92.00		3		0.92		3
			8,810				4,611

Schedule of Valuation Assumptions Using a Black-Scholes Pricing Model

Stock options issued during the years ended June 30, 2022, and 2021, have been valued using a Black-Scholes pricing model with the following assumptions:

	June 30, 2022			June 30, 2021
Dividend rate		—	%		—	%
Volatility	91% to 94%			103% to 152%
Risk-free rate	0.88% to 2.18%			0.19% to 1.28%
Term – years	5.3 to 6.1			0.4 to 5.9

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, 2020		—			—
Issuance		25,028			18,286
Issued on exercise of Series C Agent Warrants		33			79
Conversion of Series C Preferred stock to common stock		(4,969	)		(3,713	)
Balance – June 30, 2021		20,092			14,652
Conversion of Series C Preferred stock to common stock		(3,254	)		(2,377	)
Balance – June 30, 2022		16,838			12,275

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, 2022, are as follows:

Series	Number		Conversion Price $		Number of conversion shares (in thousands)		Dividend Shares (in thousands)
Series 1		13,945		1.16		12,022		8,641
Series 2		898		1.21		740		518
Series 3		1,995		1.15		1,735		1,237
		16,838				14,497		10,396

Series C Dividends	Dividend Shares (in thousands)
10% - August 19, 2021 (actual)		1,698
15% - August 19, 2022 (estimated)		2,174
20% - August 19, 2023 (estimated)		2,899
25% - August 19, 2024 (estimated)		3,625
		10,396

Schedule of Conversion of Series B Preferred Stock to Common Stock

	Series B Preferred Stock (in thousands)
	Number of shares			$
Balance – June 30, 2020		649			4,525
Conversion of Series B Preferred stock to common stock		(649	)		(4,525	)
Balance – June 30, 2021 and 2022		—			—