Equity Awards - Private Placement of Shares of Common Stock and Warrants (Details)
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1 Months Ended |
12 Months Ended |
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Mar. 25, 2022
shares
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Feb. 04, 2022
shares
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May 31, 2021
USD ($)
$ / shares
shares
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Feb. 28, 2022
USD ($)
$ / shares
shares
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May 31, 2022
USD ($)
item
$ / shares
shares
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May 31, 2021
USD ($)
$ / shares
shares
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May 31, 2020
USD ($)
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrant exercises, shares |
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1,400,000
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26,700,000
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| Warrant exercises, value | $ |
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$ 1,036,000
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$ 18,649,000
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$ 20,500,000
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| Exercise of warrants for cash | $ |
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$ 1,000,000.0
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| Cashless exercise of warrants, shares |
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200,000
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| Cashless exercise of warrants, warrants |
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300,000
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| Shares issued during the period new issues shares |
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7,900,000
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| Finance charges related to warrant issuance for surety bond backstop agreement | $ |
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$ 6,585,000
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| Proceeds from warrant exercises | $ |
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$ 1,036,000
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19,428,000
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38,422,000
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| Number Of Warrants In Fixed Combination Issue Of Securities |
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0.3
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| Proceeds from warrant transactions | $ |
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$ 5,390,000
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$ 17,060,000
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| Warrant covering common stock shares purchased, percentage |
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12.00%
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| Stock issued via offering, tender or placement, value | $ |
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13,409,000
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| Former Chief Executive Officer [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensation policy period |
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18 months
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| Shares issued during the period new issues shares |
908,418
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| Former General Counsel [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Compensation policy period |
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12 months
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| Severance payment | $ |
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$ 12,500
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| Shares issued during the period new issues shares |
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155,612
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| Registered Direct Offering [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock issued via offering, tender or placement, value | $ |
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12,666,000
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| Private Equity Offering |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares issued during the period new issues shares |
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8,900,000
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| Stock based compensation | $ |
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$ 14,000
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| Term of warrants |
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5 years
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5 years
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| Proceeds from warrant exercises | $ |
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$ 23,600,000
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| Number of common shares in a fixed combination issue of shares |
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1
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1
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| Number Of Warrants In Fixed Combination Issue Of Securities |
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1
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1
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| Stock issued via offering, tender or placement, value | $ |
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$ 46,511,000
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$ 1,000,000
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| Private Equity Offering | Consultant |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 1.04
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| Shares issued during the period new issues shares |
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15,000
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| Common stock warrants to purchase shares |
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25,000
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| Private Equity Offering | Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 0.40
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| Warrant exercises, shares |
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11,400,000
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| Shares issued during the period new issues shares |
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38,100,000
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| Common stock warrants to purchase shares |
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1,600,000
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| Term of warrants |
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7 years
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| Non-cash inducement interest expense | $ |
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$ 1,700,000
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| Cash inducement interest expense | $ |
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$ 200,000
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| Accredited Investors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrant exercises, shares |
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2,300,000
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| Shares issued during the period new issues shares |
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4,100,000
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3,500,000
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8,800,000
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| Common stock warrants to purchase shares |
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900,000
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900,000
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| Non-cash inducement interest expense | $ |
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$ 5,200,000
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| Stock issued via offering, tender or placement, value | $ |
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5,400,000
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| Private Warrant Exchange [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Warrant exercises, value | $ |
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$ 5,390,000
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$ 17,556,000
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| Warrants exchanged (in shares) |
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3,500,000
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32,600,000
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| Shares issued during the period new issues shares |
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36,200,000
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35,800,000
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| Common stock warrants to purchase shares |
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7,900,000
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| Non-cash inducement interest expense | $ |
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$ 14,000,000.0
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| Proceeds from warrant transactions | $ |
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16,200,000
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| Placement agent fees and expenses | $ |
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500,000
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| Stock issued via offering, tender or placement, value | $ |
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$ 34,900,000
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6,021,000
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| Private Warrant Exchange [Member] | Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-cash inducement interest expense | $ |
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$ 6,700,000
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13,900,000
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| Private Warrant Exchange, Non-Inducement Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares issued during the period new issues shares |
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400,000
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| Non-cash inducement interest expense | $ |
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$ 1,500,000
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| Allotment to placement agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 0.255
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| Increase in number of shares authorized |
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350,000,000
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| Term of warrants |
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10 years
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| Warrant covering common stock shares purchased, percentage |
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13.00%
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| Placement agent fees and expenses | $ |
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$ 50,000
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| Allotment to placement agent | Placement Agent |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 1.00
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| Shares issued during the period new issues shares |
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1,400,000
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| Term of warrants |
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10 years
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| Warrant covering common stock shares purchased, percentage |
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12.00%
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| Public Warrant Tender Offering [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock issued via offering, tender or placement, value | $ |
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$ 828,000
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$ 11,900,000
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| Second Private Placement [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 0.30
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| Exercise price of stock warrant combo, per share | $ / shares |
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$ 0.255
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| Shares issued during the period new issues shares |
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34,600,000
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| Term of warrants |
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5 years
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| Proceeds from warrant exercises | $ |
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$ 8,800,000
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| Number of common shares in a fixed combination issue of shares |
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1
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| Number Of Warrants In Fixed Combination Issue Of Securities |
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1
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| Proceeds from warrant transactions | $ |
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$ 7,600,000
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| Warrant exercise price percentage of final unit price |
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120.00%
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| Stock Subscription Agreements [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 1.00
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| Number of private placements conducted | item |
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2
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| Shares issued during the period new issues shares |
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11,400,000
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| Common stock warrants to purchase shares |
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5,000,000.0
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| Number of common shares in a fixed combination issue of shares |
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1
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| Proceeds from warrant transactions | $ |
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$ 1,400,000
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| Placement agent fees and expenses | $ |
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50,000
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| Proceeds from Issuance of Common Stock | $ |
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11,400,000
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| Stock issued via offering, tender or placement, value | $ |
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10,000,000.0
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| Surety Bond Backstop Agreement [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock based compensation | $ |
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$ 6,600,000
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| Common stock warrants to purchase shares |
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15,000,000
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| Interest rate |
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10.00%
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| Period of Indemnification, Payment by Indemnitors |
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90 days
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| Indemnification Fee Payment Ratio |
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1.50%
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| Initial Warrant [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock warrants to purchase shares |
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15,000,000
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| Make-Whole Warrant [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock warrants to purchase shares |
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15,000,000
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| Four Good Warrants [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 0.20
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| Finance charges related to warrant issuance for surety bond backstop agreement | $ |
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$ 6,600,000
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| Term of warrants |
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5 years
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| Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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$ 1.00
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$ 1.35
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$ 1.00
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| Cashless exercise of warrants, exercise price | $ / shares |
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0.83
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| Maximum | Private Equity Offering |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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1.80
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1.80
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| Maximum | Accredited Investors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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1.00
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1.00
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1.00
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| Maximum | Private Warrant Exchange [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.90
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0.90
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| Warrants grant date fair value | $ / shares |
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1.50
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1.50
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| Maximum | Four Good Warrants [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.30
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| Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.45
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0.45
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0.45
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| Cashless exercise of warrants, exercise price | $ / shares |
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0.40
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| Minimum | Private Equity Offering |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.40
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0.40
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| Minimum | Accredited Investors [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.40
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$ 0.45
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0.40
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| Minimum | Private Warrant Exchange [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercise price of warrants, per share | $ / shares |
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0.21
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0.21
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| Warrants grant date fair value | $ / shares |
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$ 0.30
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$ 0.30
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