Derivative Liabilities (Tables)

12 Months Ended

May 31, 2019

Schedule of Derivative Liabilities at Fair Value

The following tables summarize the fair value of the warrant derivative liability and related common shares as of inception date September 15, 2016, May 31, 2018 and May 31, 2019:    

	Shares Indexed		Derivative Liability
Inception to date September 15, 2016		7,333,334	$	5,179,200
Balance May 31, 2018		7,733,334		1,323,732
Balance May 31, 2019		7,733,334	$	402,132

Assumptions used in Estimating Fair Value of Warrant Derivative Liability

The Company estimated the fair value of the warrant derivative liability as of inception, May 31, 2018 and May 31, 2019, using the following assumptions:

	September 15,			May 31,			May 31,
	2016			2018			2019
Fair value of underlying stock	$	0.78		$	0.49		$	0.39
Risk free rate		1.20	%		2.63	%		1.94	%
Expected term (years)		5			3.3			2.29
Stock price volatility		106	%		64	%		61	%
Expected dividend yield		—			—			—
Probability of Fundamental Transaction		50	%		50	%		50	%
Probability of holder requesting cash payment		50	%		50	%		50	%

Registered Direct Equity Offering [Member] | Investor Warrants Issued With Registered Direct Equity Offering [Member]

Assumptions used in Estimating Fair Value of Warrant Derivative Liability

	November 15, 2018			January 30, 2019			May 31, 2019
							June Note			January Note
Fair value of underlying stock	$	0.57		$	0.49		$	0.39		$	0.39
Risk free rate		2.78	%		2.52	%		2.21	%		1.95	%
Expected term (in years)		1.61			2			1.07			1.67
Stock price volatility		58.8	%		61	%		62.2	%		62.2	%
Expected dividend yield		—			—			—			—
Discount factor		85	%		85	%		85	%		85	%

Convertible Note Redemption Provision Derivative Liability [Member]

Schedule of Derivative Liabilities at Fair Value

The following table summarizes the fair value of the convertible note redemption provision derivative liability as of inception dates November 15, 2018, January 30, 2019 and May 31, 2019:

			Derivative Liability
	Net Proceeds		Inception Date		May 31, 2019
Inception date June 2018 Note, November 15, 2018	$	5,000,000	$	1,284,988	$	847,103
Inception date January 2019 Note, January 30, 2019		5,000,000		1,465,008		1,158,034
					$	2,005,137