Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($) shares in Thousands, $ in Thousands |
Preferred Stock [Member] |
Common Stock
Registered Direct Offering [Member]
|
Common Stock
Public Warrant Tender Offering [Member]
|
Common Stock
Private Warrant Exchange [Member]
|
Common Stock
Private Placement [Member]
|
Common Stock |
Treasury Stock |
Additional Paid-in Capital [Member]
Registered Direct Offering [Member]
|
Additional Paid-in Capital [Member]
Public Warrant Tender Offering [Member]
|
Additional Paid-in Capital [Member]
Private Warrant Exchange [Member]
|
Additional Paid-in Capital [Member]
Private Placement [Member]
|
Additional Paid-in Capital [Member] |
Accumulated Deficit |
Registered Direct Offering [Member] |
Public Warrant Tender Offering [Member] |
Private Warrant Exchange [Member] |
Private Placement [Member] |
Total |
Beginning balance at May. 31, 2018 |
|
|
|
|
|
$ 217
|
|
|
|
|
|
$ 159,765
|
$ (173,139)
|
|
|
|
|
$ (13,158)
|
Beginning balance, shares at May. 31, 2018 |
92
|
|
|
|
|
216,882
|
159
|
|
|
|
|
|
|
|
|
|
|
|
Acquisition of ProstaGene LLC, value |
|
|
|
|
|
$ 19
|
|
|
|
|
|
11,539
|
|
|
|
|
|
11,558
|
Shares issued in acquisition |
|
|
|
|
|
18,658
|
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of stock payment shares, value |
|
|
|
|
|
$ 8
|
|
|
|
|
|
(8)
|
|
|
|
|
|
0
|
Issuance of stock payment shares, shares |
|
|
|
|
|
8,342
|
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of stock for convertible note repayment, value |
|
|
|
|
|
$ 4
|
|
|
|
|
|
1,451
|
|
|
|
|
|
1,455
|
Issuance of stock for convertible note, shares |
|
|
|
|
|
3,756
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock issued via offering, tender or placement, value |
|
$ 24
|
|
$ 11
|
$ 47
|
|
|
$ 11,791
|
|
$ 2,955
|
$ 23,441
|
3,084
|
|
$ 11,815
|
|
$ 2,966
|
$ 23,488
|
3,084
|
Stock issued via offering, tender or placement, shares |
3
|
23,630
|
|
11,312
|
46,975
|
|
|
|
|
|
|
|
|
|
|
|
47,000
|
|
Offering costs, stock and warrants |
|
|
|
|
|
|
|
(1,130)
|
|
(267)
|
(2,697)
|
|
|
(1,130)
|
|
(267)
|
$ (2,697)
|
|
Issuance costs related to debt offering |
|
|
|
|
|
|
|
|
|
|
|
261
|
|
|
|
|
|
261
|
Debt discount costs related to debt offering |
|
|
|
|
|
|
|
|
|
|
|
3,059
|
|
|
|
|
|
3,059
|
Beneficial conversion feature on note payable and relative fair value associated with warrants |
|
|
|
|
|
|
|
|
|
|
|
3,535
|
|
|
|
|
|
3,535
|
Inducement interest expense |
|
|
|
|
|
|
|
|
|
|
|
196
|
|
|
|
|
|
196
|
Dividends accrued on preferred stock |
|
|
|
|
|
|
|
|
|
|
|
|
(37)
|
|
|
|
|
(37)
|
Legal fees in connection with equity offerings |
|
|
|
|
|
|
|
|
|
|
|
(243)
|
|
|
|
|
|
(243)
|
Stock-based compensation |
|
|
|
|
|
|
|
|
|
|
|
3,388
|
|
|
|
|
|
3,388
|
Stock issued for services, value |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8
|
Net loss |
|
|
|
|
|
|
|
|
|
|
|
|
(56,187)
|
|
|
|
|
(56,187)
|
Ending balance at May. 31, 2019 |
|
|
|
|
|
$ 330
|
|
|
|
|
|
220,120
|
(229,363)
|
|
|
|
|
(8,913)
|
Ending balance, shares at May. 31, 2019 |
95
|
|
|
|
|
329,555
|
159
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of stock for convertible note repayment, value |
|
|
|
|
|
$ 23
|
|
|
|
|
|
10,799
|
|
|
|
|
|
10,822
|
Issuance of stock for convertible note, shares |
|
|
|
|
|
22,967
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock issued via offering, tender or placement, value |
|
$ 39
|
$ 45
|
$ 20
|
|
|
|
12,627
|
$ 11,855
|
6,001
|
|
13,409
|
|
12,666
|
$ 11,900
|
6,021
|
|
13,409
|
Stock issued via offering, tender or placement, shares |
14
|
38,856
|
45,376
|
20,529
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Offering costs, stock and warrants |
|
|
|
|
|
|
|
$ (378)
|
(1,059)
|
(197)
|
|
(437)
|
|
$ (378)
|
(1,059)
|
(197)
|
|
(437)
|
SHARES PLACEHOLDER |
|
|
|
|
|
8,232
|
|
|
|
|
|
|
|
|
|
|
|
|
Inducement interest expense |
|
|
|
|
|
|
|
|
$ 2,713
|
5,191
|
|
|
|
|
$ 2,713
|
5,191
|
|
|
Dividends accrued on preferred stock |
|
|
|
|
|
|
|
|
|
|
|
|
(945)
|
|
|
|
|
(945)
|
Legal fees in connection with equity offerings |
|
|
|
|
|
|
|
|
|
|
|
(16)
|
|
|
|
|
|
(16)
|
Stock-based compensation |
|
|
|
|
|
|
|
|
|
|
|
6,548
|
|
|
|
|
|
6,548
|
Note conversion and extension fees |
|
|
|
|
|
$ 8
|
|
|
|
|
|
3,891
|
|
|
|
|
|
3,899
|
Warrant exercises, value |
|
|
|
|
|
$ 42
|
|
|
|
|
|
20,458
|
|
|
|
|
|
20,500
|
Warrant exercises, shares |
|
|
|
|
|
42,024
|
|
|
|
|
|
|
|
|
|
|
|
|
Relative fair market value associated with warrants exercised |
|
|
|
|
|
|
|
|
|
|
|
11,949
|
|
|
|
|
|
11,949
|
Exercise of option to repurchase common stock, value |
|
|
|
|
|
|
|
|
|
|
|
(8)
|
|
|
|
|
|
(8)
|
Stock issued for services, value |
|
|
|
|
|
$ 3
|
|
|
|
|
|
(3)
|
|
|
|
|
|
3
|
Stock issued for services, shares |
|
|
|
|
|
2,620
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock issued for incentive compensation and tendered for income tax |
|
|
|
|
|
|
|
|
|
|
|
154
|
|
|
|
|
|
154
|
Stock issued for incentive compensation and tendered for income tax , shares |
|
|
|
|
|
380
|
127
|
|
|
|
|
|
|
|
|
|
|
|
Stock option exercises, value |
|
|
|
|
|
$ 9
|
|
|
|
|
|
5,594
|
|
|
|
|
|
5,603
|
Stock option exercises, shares |
|
|
|
|
|
8,723
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock issued in legal settlement, value |
|
|
|
|
|
|
|
|
|
|
|
22,500
|
|
|
|
|
|
22,500
|
Net loss |
|
|
|
|
|
|
|
|
|
|
|
|
(124,403)
|
|
|
|
|
(124,403)
|
Ending balance at May. 31, 2020 |
|
|
|
|
|
$ 519
|
|
|
|
|
|
351,711
|
(354,711)
|
|
|
|
|
$ (2,481)
|
Ending balance, shares at May. 31, 2020 |
109
|
|
|
|
|
519,262
|
286
|
|
|
|
|
|
|
|
|
|
|
|
Issuance of stock payment shares, shares |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8,300
|
Issuance of stock for convertible note repayment, value |
|
|
|
|
|
$ 24
|
|
|
|
|
|
77,679
|
|
|
|
|
|
$ 77,703
|
Issuance of stock for convertible note, shares |
|
|
|
|
|
24,154
|
|
|
|
|
|
|
|
|
|
|
|
|
Stock issued via offering, tender or placement, value |
|
|
|
$ 37
|
$ 1
|
|
|
|
|
17,519
|
$ 999
|
|
|
|
|
17,556
|
$ 1,000
|
|
Stock issued via offering, tender or placement, shares |
|
|
|
37,054
|
667
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Offering costs, stock and warrants |
|
|
|
|
|
|
|
|
|
$ (495)
|
|
|
|
|
|
$ (495)
|
|
|
Inducement interest expense |
|
|
|
|
|
|
|
|
|
|
|
11,366
|
|
|
|
|
|
11,366
|
Dividends accrued on preferred stock |
|
|
|
|
|
|
|
|
|
|
|
|
(1,909)
|
|
|
|
|
(1,909)
|
Stock-based compensation |
|
|
|
|
|
|
|
|
|
|
|
8,822
|
|
|
|
|
|
8,822
|
Warrant exercises, value |
|
|
|
|
|
$ 38
|
|
|
|
|
|
19,390
|
|
|
|
|
|
$ 19,428
|
Warrant exercises, shares |
|
|
|
|
|
37,941
|
|
|
|
|
|
|
|
|
|
|
|
27,300
|
Stock issued for incentive compensation and tendered for income tax |
|
|
|
|
|
|
|
|
|
|
|
828
|
|
|
|
|
|
$ 828
|
Stock issued for incentive compensation and tendered for income tax , shares |
|
|
|
|
|
323
|
157
|
|
|
|
|
|
|
|
|
|
|
|
Stock option exercises, value |
|
|
|
|
|
$ 3
|
|
|
|
|
|
1,835
|
|
|
|
|
|
$ 1,838
|
Stock option exercises, shares |
|
|
|
|
|
2,591
|
|
|
|
|
|
|
|
|
|
|
|
2,600
|
Stock issued in legal settlement, value |
|
|
|
|
|
$ 4
|
|
|
|
|
|
(4)
|
|
|
|
|
|
|
Stock issued in legal settlement, shares |
|
|
|
|
|
4,000
|
|
|
|
|
|
|
|
|
|
|
|
|
Conversion of Series B preferred stock to common stock, shares |
(13)
|
|
|
|
|
131
|
|
|
|
|
|
|
|
|
|
|
|
|
Net loss |
|
|
|
|
|
|
|
|
|
|
|
|
(154,674)
|
|
|
|
|
$ (154,674)
|
Ending balance at May. 31, 2021 |
|
|
|
|
|
$ 626
|
|
|
|
|
|
$ 489,650
|
$ (511,294)
|
|
|
|
|
$ (21,018)
|
Ending balance, shares at May. 31, 2021 |
96
|
|
|
|
|
626,123
|
443
|
|
|
|
|
|
|
|
|
|
|
|