Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
|
Total |
Fiscal Year To Date |
Preferred Stock [Member] |
Common Stock [Member] |
Treasury Stock [Member] |
Additional Paid-in Capital [Member] |
Accumulated Deficit [Member] |
| Beginning balance at May. 31, 2019 |
$ (8,914,060)
|
$ (8,914,060)
|
$ 95
|
$ 329,555
|
$ (159)
|
$ 220,119,856
|
$ (229,363,407)
|
| Beginning balance, shares at May. 31, 2019 |
|
|
95,346
|
329,554,763
|
159,011
|
|
|
| Issuance of stock for note payable redemptions and conversions |
1,005,000
|
1,005,000
|
|
$ 3,015
|
|
1,001,985
|
|
| Issuance of stock for note payable redemptions and conversions ,shares |
|
|
|
3,014,181
|
|
|
|
| Proceeds from registered direct offering |
2,255,800
|
2,255,800
|
|
$ 5,640
|
|
2,250,160
|
|
| Proceeds from registered direct offering, shares |
|
|
|
5,639,500
|
|
|
|
| Offering costs related to registered direct offering, value |
(260,208)
|
(260,208)
|
|
|
|
(260,208)
|
|
| Proceeds from public warrant tender offers |
11,900,260
|
11,900,260
|
|
$ 45,376
|
|
11,854,884
|
|
| Proceeds from public warrant tender offers (shares) |
|
|
|
45,375,923
|
|
|
|
| Proceeds from Series C Convertible Preferred offering |
1,754,000
|
1,754,000
|
$ 2
|
|
|
1,753,998
|
|
| Proceeds from Series C Convertible Preferred offering, shares |
|
|
1,754
|
|
|
|
|
| Offering costs related to Series C Preferred offering |
(197,460)
|
(197,460)
|
|
|
|
(197,460)
|
|
| Dividends on Series C Convertible Preferred shares |
(110,826)
|
(110,826)
|
|
|
|
|
(110,826)
|
| Legal fees in connection with equity offerings |
(15,877)
|
(15,877)
|
|
|
|
(15,877)
|
|
| Offering costs related to public warrant tender offers |
(1,058,466)
|
(1,058,466)
|
|
|
|
(1,058,466)
|
|
| Stock-based compensation |
580,727
|
580,727
|
|
|
|
580,727
|
|
| Inducement interest expense - debt conversion |
2,430,514
|
2,430,514
|
|
|
|
2,430,514
|
|
| Net loss |
(16,163,999)
|
(16,163,999)
|
|
|
|
|
(16,163,999)
|
| Ending balance at Aug. 31, 2019 |
(6,794,595)
|
(6,794,595)
|
$ 97
|
$ 383,586
|
$ (159)
|
238,460,113
|
(245,638,232)
|
| Ending balance, shares at Aug. 31, 2019 |
|
|
97,100
|
383,584,367
|
159,011
|
|
|
| Beginning balance at May. 31, 2019 |
(8,914,060)
|
(8,914,060)
|
$ 95
|
$ 329,555
|
$ (159)
|
220,119,856
|
(229,363,407)
|
| Beginning balance, shares at May. 31, 2019 |
|
|
95,346
|
329,554,763
|
159,011
|
|
|
| Ending balance at Nov. 30, 2019 |
(13,631,597)
|
(13,631,597)
|
$ 100
|
$ 399,316
|
$ (159)
|
246,618,030
|
(260,648,884)
|
| Ending balance, shares at Nov. 30, 2019 |
|
|
99,888
|
399,315,351
|
159,011
|
|
|
| Beginning balance at May. 31, 2019 |
(8,914,060)
|
(8,914,060)
|
$ 95
|
$ 329,555
|
$ (159)
|
220,119,856
|
(229,363,407)
|
| Beginning balance, shares at May. 31, 2019 |
|
|
95,346
|
329,554,763
|
159,011
|
|
|
| Net loss |
(66,792,196)
|
|
|
|
|
|
|
| Ending balance at Feb. 29, 2020 |
(4,383,111)
|
(4,383,111)
|
$ 108
|
$ 471,092
|
$ (286)
|
291,829,006
|
(296,683,031)
|
| Ending balance, shares at Feb. 29, 2020 |
|
|
107,873
|
471,092,106
|
286,008
|
|
|
| Beginning balance at Aug. 31, 2019 |
(6,794,595)
|
(6,794,595)
|
$ 97
|
$ 383,586
|
$ (159)
|
238,460,113
|
(245,638,232)
|
| Beginning balance, shares at Aug. 31, 2019 |
|
|
97,100
|
383,584,367
|
159,011
|
|
|
| Issuance of stock for note payable redemptions and conversions |
739,959
|
1,744,959
|
|
$ 2,269
|
|
737,690
|
|
| Issuance of stock for note payable redemptions and conversions ,shares |
|
|
|
2,270,151
|
|
|
|
| Proceeds from registered direct offering |
4,409,500
|
6,665,300
|
|
$ 13,461
|
|
4,396,039
|
|
| Proceeds from registered direct offering, shares |
|
|
|
13,460,833
|
|
|
|
| Offering costs related to registered direct offering, value |
(73,690)
|
(333,898)
|
|
|
|
(73,690)
|
|
| Proceeds from public warrant tender offers |
|
11,900,260
|
|
|
|
|
|
| Proceeds from Series C Convertible Preferred offering |
2,788,000
|
4,542,000
|
$ 3
|
|
|
2,787,997
|
|
| Proceeds from Series C Convertible Preferred offering, shares |
|
|
2,788
|
|
|
|
|
| Offering costs related to Series C Preferred offering |
(181,722)
|
(379,182)
|
|
|
|
(181,722)
|
|
| Dividends on Series C Convertible Preferred shares |
(150,184)
|
(261,010)
|
|
|
|
|
(150,184)
|
| Legal fees in connection with equity offerings |
|
(15,877)
|
|
|
|
|
|
| Offering costs related to public warrant tender offers |
|
(1,058,466)
|
|
|
|
|
|
| Stock-based compensation |
434,245
|
1,014,972
|
|
|
|
434,245
|
|
| Note conversion and extension fees, Value |
(216,800)
|
(216,800)
|
|
|
|
(216,800)
|
|
| Exercise of option to repurchase common stock |
(8,342)
|
(8,342)
|
|
|
|
(8,342)
|
|
| Inducement interest expense - debt conversion |
282,500
|
2,713,014
|
|
|
|
282,500
|
|
| Net loss |
(14,860,468)
|
(31,024,467)
|
|
|
|
|
(14,860,468)
|
| Ending balance at Nov. 30, 2019 |
(13,631,597)
|
(13,631,597)
|
$ 100
|
$ 399,316
|
$ (159)
|
246,618,030
|
(260,648,884)
|
| Ending balance, shares at Nov. 30, 2019 |
|
|
99,888
|
399,315,351
|
159,011
|
|
|
| Issuance of stock for note payable redemptions and conversions |
9,077,229
|
10,822,188
|
|
$ 17,683
|
|
9,059,546
|
|
| Issuance of stock for note payable redemptions and conversions ,shares |
|
|
|
17,682,895
|
|
|
|
| Proceeds from registered direct offering |
6,000,499
|
12,665,799
|
|
$ 19,756
|
|
5,980,743
|
|
| Proceeds from registered direct offering, shares |
|
|
|
19,755,761
|
|
|
|
| Offering costs related to registered direct offering, value |
(43,961)
|
(377,859)
|
|
|
|
(43,961)
|
|
| Proceeds from public warrant tender offers |
|
11,900,260
|
|
|
|
|
|
| Proceeds from private warrant exchange |
5,985,092
|
5,985,092
|
|
$ 20,439
|
|
5,964,653
|
|
| Proceeds from private warrant exchange, shares |
|
|
|
20,440,745
|
|
|
|
| Offering costs related to private warrant exchange |
(197,253)
|
(197,253)
|
|
|
|
(197,253)
|
|
| Inducement interest expense - public warrant tender offers |
5,163,110
|
5,163,110
|
|
|
|
5,163,110
|
|
| Proceeds from Series C Convertible Preferred offering |
415,000
|
4,957,000
|
|
|
|
415,000
|
|
| Proceeds from Series C Convertible Preferred offering, shares |
|
|
415
|
|
|
|
|
| Offering costs related to Series C Preferred offering |
(53,186)
|
(432,368)
|
|
|
|
(53,186)
|
|
| Dividends on Series C Convertible Preferred shares |
(204,199)
|
(465,209)
|
|
|
|
|
(204,199)
|
| Legal fees in connection with equity offerings |
|
(15,877)
|
|
|
|
|
|
| Offering costs related to public warrant tender offers |
|
(1,058,466)
|
|
|
|
|
|
| Stock-based compensation |
3,330,536
|
4,345,508
|
|
|
|
3,330,536
|
|
| Stock issued for bonuses and tendered for income tax, value |
154,552
|
154,552
|
|
$ 380
|
$ (127)
|
154,299
|
|
| Stock issued for bonuses and tendered for income tax, shares |
|
|
|
379,880
|
126,997
|
|
|
| Proceeds from warrant exercise |
5,427,687
|
5,427,687
|
|
$ 10,716
|
|
5,416,971
|
|
| Proceeds from warrant exercise, shares |
|
|
|
10,715,732
|
|
|
|
| Note conversion and extension fees, Value |
0
|
(216,800)
|
|
$ 0
|
|
0
|
|
| Note conversion and extension fees, Shares |
|
|
|
0
|
|
|
|
| Exercise of option to repurchase common stock |
|
(8,342)
|
|
|
|
|
|
| Inducement interest expense - debt conversion |
|
2,713,014
|
|
|
|
|
|
| Net loss |
(35,767,729)
|
(66,792,196)
|
|
|
|
|
(35,767,729)
|
| Proceeds from Series D Convertible Preferred offering |
7,570,000
|
7,570,000
|
$ 8
|
|
|
7,569,992
|
|
| Proceeds from Series D Convertible Preferred offering, shares |
|
|
7,570
|
|
|
|
|
| Stock issued for services |
|
|
|
$ 2,620
|
|
(2,620)
|
|
| Stock issued for services, shares |
|
|
|
2,620,000
|
|
|
|
| Dividends on Series D Convertible Preferred shares |
(62,219)
|
(62,219)
|
|
|
|
|
(62,219)
|
| Offering costs related to Series D Preferred offering |
(4,645)
|
(4,645)
|
|
|
|
(4,645)
|
|
| Relative fair market value associated with warrants exercised |
2,404,098
|
2,404,098
|
|
|
|
2,404,098
|
|
| Exercise of stock options |
53,875
|
53,875
|
|
$ 182
|
|
53,693
|
|
| Exercise of stock options, shares |
|
|
|
181,742
|
|
|
|
| Ending balance at Feb. 29, 2020 |
$ (4,383,111)
|
$ (4,383,111)
|
$ 108
|
$ 471,092
|
$ (286)
|
$ 291,829,006
|
$ (296,683,031)
|
| Ending balance, shares at Feb. 29, 2020 |
|
|
107,873
|
471,092,106
|
286,008
|
|
|