Consolidated Statement of Changes in Stockholders' Deficit - USD ($)
shares in Thousands, $ in Thousands |
Preferred stock |
Common stock |
Treasury stock |
Additional paid-in capital |
Accumulated deficit |
Total |
| Beginning balance at May. 31, 2024 |
|
$ 1,059
|
|
$ 773,714
|
$ (891,531)
|
$ (116,758)
|
| Beginning balance (shares) at May. 31, 2024 |
34
|
1,059,002
|
|
|
|
|
| Beginning balance treasury stock (shares) at May. 31, 2024 |
|
|
443
|
|
|
|
| Issuance of stock for convertible note repayment |
|
$ 9
|
|
991
|
|
1,000
|
| Issuance of stock for convertible note repayment (in shares) |
|
8,777
|
|
|
|
|
| Stock issued for tender offer |
|
$ 152
|
|
13,874
|
|
14,026
|
| Stock issued for tender offer (in shares) |
|
152,505
|
|
|
|
|
| Issuance costs related to stock issued for tender offer |
|
|
|
(3,649)
|
|
(3,649)
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(372)
|
|
(372)
|
| Stock-based compensation |
|
|
|
136
|
|
136
|
| Loss on induced conversion |
|
|
|
1,180
|
|
1,180
|
| Net (loss) income |
|
|
|
|
19,227
|
19,227
|
| Ending balance at Aug. 31, 2024 |
|
$ 1,220
|
|
785,874
|
(872,304)
|
(85,210)
|
| Ending balance (shares) at Aug. 31, 2024 |
34
|
1,220,284
|
|
|
|
|
| Ending balance treasury stock (shares) at Aug. 31, 2024 |
|
|
443
|
|
|
|
| Beginning balance at May. 31, 2024 |
|
$ 1,059
|
|
773,714
|
(891,531)
|
(116,758)
|
| Beginning balance (shares) at May. 31, 2024 |
34
|
1,059,002
|
|
|
|
|
| Beginning balance treasury stock (shares) at May. 31, 2024 |
|
|
443
|
|
|
|
| Net (loss) income |
|
|
|
|
|
9,701
|
| Ending balance at Feb. 28, 2025 |
|
$ 1,233
|
|
787,618
|
(881,830)
|
(92,979)
|
| Ending balance (shares) at Feb. 28, 2025 |
34
|
1,232,591
|
|
|
|
|
| Ending balance treasury stock (shares) at Feb. 28, 2025 |
|
|
286
|
|
|
|
| Beginning balance at Aug. 31, 2024 |
|
$ 1,220
|
|
785,874
|
(872,304)
|
(85,210)
|
| Beginning balance (shares) at Aug. 31, 2024 |
34
|
1,220,284
|
|
|
|
|
| Beginning balance treasury stock (shares) at Aug. 31, 2024 |
|
|
443
|
|
|
|
| Issuance of stock for convertible note repayment |
|
$ 4
|
|
416
|
|
420
|
| Issuance of stock for convertible note repayment (in shares) |
|
3,233
|
|
|
|
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(369)
|
|
(369)
|
| Stock-based compensation |
|
|
|
537
|
|
537
|
| Net (loss) income |
|
|
|
|
(4,768)
|
(4,768)
|
| Ending balance at Nov. 30, 2024 |
|
$ 1,224
|
|
786,458
|
(877,072)
|
(89,390)
|
| Ending balance (shares) at Nov. 30, 2024 |
34
|
1,223,517
|
|
|
|
|
| Ending balance treasury stock (shares) at Nov. 30, 2024 |
|
|
443
|
|
|
|
| Issuance of stock for convertible note repayment |
|
$ 8
|
|
1,165
|
|
1,173
|
| Issuance of stock for convertible note repayment (in shares) |
|
7,802
|
|
|
|
|
| Stock option exercises |
|
|
|
21
|
|
21
|
| Stock option exercises (in shares) |
|
100
|
|
|
|
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(365)
|
|
(365)
|
| Stock-based compensation |
|
|
|
300
|
|
300
|
| Stock issued for compensation |
|
|
|
40
|
|
40
|
| Stock issued for compensation (in shares) |
|
162
|
|
|
|
|
| Stock adjustment |
|
$ (1)
|
|
|
|
(1)
|
| Stock adjustment (in shares) |
|
(651)
|
(157)
|
|
|
|
| Exercise of warrants, net of issuance costs |
|
$ 2
|
|
(1)
|
|
1
|
| Exercise of warrants, net of issuance costs (in shares) |
|
1,661
|
|
|
|
|
| Net (loss) income |
|
|
|
|
(4,758)
|
(4,758)
|
| Ending balance at Feb. 28, 2025 |
|
$ 1,233
|
|
787,618
|
(881,830)
|
(92,979)
|
| Ending balance (shares) at Feb. 28, 2025 |
34
|
1,232,591
|
|
|
|
|
| Ending balance treasury stock (shares) at Feb. 28, 2025 |
|
|
286
|
|
|
|
| Beginning balance at May. 31, 2025 |
|
$ 1,249
|
|
790,495
|
(887,786)
|
$ (96,042)
|
| Beginning balance (shares) at May. 31, 2025 |
34
|
1,249,460
|
|
|
|
|
| Beginning balance treasury stock (shares) at May. 31, 2025 |
|
|
286
|
|
|
286
|
| Issuance of stock for convertible note repayment |
|
$ 8
|
|
2,242
|
|
$ 2,250
|
| Issuance of stock for convertible note repayment (in shares) |
|
7,462
|
|
|
|
|
| Stock option exercises |
|
|
|
21
|
|
21
|
| Stock option exercises (in shares) |
|
100
|
|
|
|
|
| Warrant exercises (in shares) |
|
23
|
|
|
|
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(373)
|
|
(373)
|
| Stock-based compensation |
|
|
|
180
|
|
180
|
| Net (loss) income |
|
|
|
|
(5,540)
|
(5,540)
|
| Ending balance at Aug. 31, 2025 |
|
$ 1,257
|
|
792,565
|
(893,326)
|
(99,504)
|
| Ending balance (shares) at Aug. 31, 2025 |
34
|
1,257,045
|
|
|
|
|
| Ending balance treasury stock (shares) at Aug. 31, 2025 |
|
|
286
|
|
|
|
| Beginning balance at May. 31, 2025 |
|
$ 1,249
|
|
790,495
|
(887,786)
|
$ (96,042)
|
| Beginning balance (shares) at May. 31, 2025 |
34
|
1,249,460
|
|
|
|
|
| Beginning balance treasury stock (shares) at May. 31, 2025 |
|
|
286
|
|
|
286
|
| Stock issued for tender offer (in shares) |
|
|
|
|
|
3,200
|
| Net (loss) income |
|
|
|
|
|
$ (32,837)
|
| Ending balance at Feb. 28, 2026 |
|
$ 1,358
|
|
814,978
|
(920,623)
|
$ (104,287)
|
| Ending balance (shares) at Feb. 28, 2026 |
34
|
1,358,242
|
|
|
|
|
| Ending balance treasury stock (shares) at Feb. 28, 2026 |
|
|
286
|
|
|
286
|
| Beginning balance at Aug. 31, 2025 |
|
$ 1,257
|
|
792,565
|
(893,326)
|
$ (99,504)
|
| Beginning balance (shares) at Aug. 31, 2025 |
34
|
1,257,045
|
|
|
|
|
| Beginning balance treasury stock (shares) at Aug. 31, 2025 |
|
|
286
|
|
|
|
| Issuance of stock for convertible note repayment |
|
$ 8
|
|
2,242
|
|
2,250
|
| Issuance of stock for convertible note repayment (in shares) |
|
8,060
|
|
|
|
|
| Warrant exercises (in shares) |
|
399
|
|
|
|
|
| Standby equity purchase agreement commitment fee |
|
$ 1
|
|
299
|
|
300
|
| Standby equity purchase agreement commitment fee (in shares) |
|
635
|
|
|
|
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(369)
|
|
(369)
|
| Stock-based compensation |
|
|
|
183
|
|
183
|
| Net (loss) income |
|
|
|
|
(22,607)
|
(22,607)
|
| Ending balance at Nov. 30, 2025 |
|
$ 1,266
|
|
794,920
|
(915,933)
|
(119,747)
|
| Ending balance (shares) at Nov. 30, 2025 |
34
|
1,266,139
|
|
|
|
|
| Ending balance treasury stock (shares) at Nov. 30, 2025 |
|
|
286
|
|
|
|
| Issuance of stock for convertible note repayment |
|
$ 9
|
|
2,241
|
|
2,250
|
| Issuance of stock for convertible note repayment (in shares) |
|
8,562
|
|
|
|
|
| Stock issued for tender offer |
|
$ 80
|
|
19,941
|
|
20,021
|
| Stock issued for tender offer (in shares) |
|
80,341
|
|
|
|
|
| Issuance costs related to stock to be issued for private offerings |
|
|
|
(3,075)
|
|
(3,075)
|
| Dividends accrued on Series C and D convertible preferred stock |
|
|
|
(364)
|
|
(364)
|
| Stock-based compensation |
|
|
|
444
|
|
444
|
| Standby equity purchase agreement advance notices |
|
$ 3
|
|
871
|
|
874
|
| Standby equity purchase agreement advance notices (in shares) |
|
3,200
|
|
|
|
|
| Net (loss) income |
|
|
|
|
(4,690)
|
(4,690)
|
| Ending balance at Feb. 28, 2026 |
|
$ 1,358
|
|
$ 814,978
|
$ (920,623)
|
$ (104,287)
|
| Ending balance (shares) at Feb. 28, 2026 |
34
|
1,358,242
|
|
|
|
|
| Ending balance treasury stock (shares) at Feb. 28, 2026 |
|
|
286
|
|
|
286
|