Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
Operating expenses:
General and administrative	$ 2,688	$ 6,333
Research and development	1,914	576
Amortization and depreciation	10	99
Inventory charge		2,704
Total operating expenses	4,612	9,712
Operating loss	(4,612)	(9,712)
Interest and other expenses:
Interest on convertible notes	(1,197)	(1,146)
Amortization of discount on convertible notes	(400)	(576)
Amortization of debt issuance costs	(366)	(16)
Loss on induced conversion	(2,004)
Finance charges	(912)	(940)
Loss on note extinguishment	(2,084)
Gain (loss) on derivatives	4	(8,601)
Total interest and other expenses	(6,959)	(11,279)
Loss before income taxes	(11,571)	(20,991)
Income tax benefit	0	0
Net loss	$ (11,571)	$ (20,991)
Weighted average common shares outstanding, Basic	923,587	787,856
Weighted average common shares outstanding, Diluted	923,587	787,856
Loss per share, Basic	$ (0.01)	$ (0.03)
Loss per share, Diluted	$ (0.01)	$ (0.03)