Convertible Instruments and Accrued Interest - Components (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Feb. 28, 2023	May 31, 2022
Debt Instrument [Line Items]
Outstanding balance, beginning	$ 42,215	$ 64,754
Amortization of issuance discount and costs	1,772	3,045
Interest expense	3,447	5,417
Fair market value of shares exchanged for repayment	(2,656)	(42,073)
Difference between market value of common shares and reduction of principle	656	(11,072)
Outstanding balance, ending	45,434	42,215
Long-term Convertible Note - November 2020 Note
Debt Instrument [Line Items]
Outstanding balance, beginning		13,554
Amortization of issuance discount and costs		98
Interest expense		192
Fair market value of shares exchanged for repayment		(18,495)
Difference between market value of common shares and reduction of principle		(4,651)
Long-term Convertible Note - April 2, 2021 Note
Debt Instrument [Line Items]
Outstanding balance, beginning	11,907	25,715
Amortization of issuance discount and costs	463	1,197
Interest expense	936	2,152
Fair market value of shares exchanged for repayment	(2,656)	(23,578)
Difference between market value of common shares and reduction of principle	656	(6,421)
Outstanding balance, ending	11,305	11,907
Long-term Convertible Note - April 23, 2021 Note
Debt Instrument [Line Items]
Outstanding balance, beginning	30,309	25,485
Amortization of issuance discount and costs	1,309	1,750
Interest expense	2,511	3,073
Outstanding balance, ending	$ 34,129	$ 30,309

Represents changes in fair value of common stocks of convertible debt.

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- Definition

The fair market value of shares of the entity's stock exchanged in repayment of debt.

+ References

No definition available.

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- Definition

Represents the portion of interest accrued in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

No definition available.

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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