Restatement (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 28, 2023 |
Nov. 30, 2022 |
Aug. 31, 2022 |
Feb. 28, 2022 |
Nov. 30, 2021 |
Aug. 31, 2021 |
Feb. 28, 2021 |
Nov. 30, 2020 |
Nov. 30, 2021 |
Nov. 30, 2020 |
Feb. 28, 2023 |
Feb. 28, 2022 |
Feb. 28, 2021 |
May 31, 2022 |
May 31, 2021 |
May 31, 2020 |
May 31, 2019 |
May 31, 2018 |
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| Reclassification [Line Items] | ||||||||||||||||||||||||||
| Loss on induced conversion | $ (12,066) | $ (6,785) | $ (18,530) | $ (6,724) | $ (25,315) | $ (6,724) | $ 2,700 | $ (37,381) | $ (6,724) | $ (39,131) | ||||||||||||||||
| Inducement interest expense | (954) | [1] | (528) | $ (5,360) | (4,217) | (7,562) | (6,186) | [1] | (12,922) | $ (6,691) | (13,922) | |||||||||||||||
| Total interest and other expense | (21,888) | (14,755) | (23,700) | (6,796) | (13,477) | (38,455) | (18,637) | (60,343) | (25,433) | (71,869) | ||||||||||||||||
| Loss before income taxes | $ (13,702) | (41,285) | [1] | (40,077) | (45,337) | (37,581) | (37,980) | (85,414) | (68,812) | (61,188) | (126,699) | [1] | (106,393) | (210,820) | (176,465) | |||||||||||
| Net loss | $ (13,702) | $ (26,495) | $ (20,991) | $ (41,285) | [1],[2] | $ (40,077) | [1] | $ (45,337) | [1] | $ (37,581) | $ (37,980) | $ (85,414) | $ (68,812) | $ (61,188) | $ (126,699) | [1],[2] | $ (106,393) | $ (210,820) | $ (176,465) | |||||||
| Basic loss per share | $ (0.02) | $ (0.06) | [1],[2] | $ (0.06) | $ (0.07) | $ (0.07) | $ (0.07) | $ (0.13) | $ (0.12) | $ (0.08) | $ (0.19) | [1],[2] | $ (0.18) | $ (0.31) | $ (0.30) | |||||||||||
| Diluted loss per share | $ (0.02) | $ (0.06) | $ (0.06) | $ (0.07) | $ (0.07) | $ (0.07) | $ (0.13) | $ (0.12) | $ (0.08) | $ (0.19) | $ (0.18) | $ (0.31) | $ (0.30) | |||||||||||||
| Additional paid-in capital | $ 715,207 | $ 658,449 | $ 626,558 | $ 573,595 | $ 466,779 | $ 438,067 | $ 626,558 | $ 438,067 | $ 715,207 | $ 658,449 | $ 466,779 | $ 671,013 | $ 532,031 | |||||||||||||
| Accumulated deficit | $ (823,054) | (681,622) | (639,940) | (599,432) | (483,183) | (445,191) | (639,940) | (445,191) | $ (823,054) | (681,622) | (483,183) | $ (766,131) | (553,675) | |||||||||||||
| Adjustments | $ 15,533 | $ 4,532 | $ 525 | |||||||||||||||||||||||
| Previously Reported | ||||||||||||||||||||||||||
| Reclassification [Line Items] | ||||||||||||||||||||||||||
| Loss on induced conversion | (3,109) | (3,312) | (4,651) | (7,625) | (4,169) | (7,963) | (4,169) | (11,072) | (11,794) | (19,896) | ||||||||||||||||
| Inducement interest expense | (9) | (4,139) | (3,758) | (7,103) | (11,242) | (11,366) | ||||||||||||||||||||
| Total interest and other expense | (12,931) | (11,282) | (9,302) | (13,200) | (10,463) | (21,103) | (15,623) | (34,034) | (28,823) | (50,078) | ||||||||||||||||
| Loss before income taxes | (32,328) | (36,604) | (30,939) | (43,985) | (34,966) | (67,543) | (65,798) | (99,871) | (109,783) | (154,674) | ||||||||||||||||
| Net loss | $ (32,328) | $ (36,604) | $ (30,939) | $ (43,985) | $ (34,966) | $ (67,543) | $ (65,798) | $ (99,871) | $ (109,783) | $ (154,674) | ||||||||||||||||
| Basic loss per share | $ (0.05) | $ (0.06) | $ (0.05) | $ (0.08) | $ (0.06) | $ (0.11) | $ (0.12) | $ (0.15) | $ (0.18) | $ (0.27) | ||||||||||||||||
| Diluted loss per share | $ (0.05) | $ (0.06) | $ (0.05) | $ (0.08) | $ (0.06) | $ (0.11) | $ (0.12) | $ (0.15) | $ (0.18) | $ (0.27) | ||||||||||||||||
| Additional paid-in capital | $ 612,905 | $ 589,971 | $ 516,816 | $ 449,579 | $ 414,463 | $ 589,971 | $ 414,463 | $ 612,905 | $ 449,579 | $ 489,650 | ||||||||||||||||
| Accumulated deficit | (636,078) | (603,353) | (542,653) | (465,983) | (421,587) | (603,353) | (421,587) | (636,078) | (465,983) | (511,294) | ||||||||||||||||
| Adjustments | ||||||||||||||||||||||||||
| Reclassification [Line Items] | ||||||||||||||||||||||||||
| Loss on induced conversion | (8,957) | (3,473) | (13,879) | 7,625 | (2,555) | (17,352) | (2,555) | (26,309) | 5,070 | (19,235) | ||||||||||||||||
| Inducement interest expense | (519) | (1,221) | (459) | (459) | (1,680) | (2,556) | ||||||||||||||||||||
| Total interest and other expense | (8,957) | (3,473) | (14,398) | 6,404 | (3,014) | (17,352) | (3,014) | (26,309) | 3,390 | (21,791) | ||||||||||||||||
| Loss before income taxes | (8,957) | (3,473) | (14,398) | 6,404 | (3,014) | (17,871) | (3,014) | (26,828) | 3,390 | (21,791) | ||||||||||||||||
| Net loss | $ (8,957) | $ (3,473) | $ (14,398) | $ 6,404 | $ (3,014) | $ (17,871) | $ (3,014) | $ (26,828) | $ 3,390 | $ (21,791) | ||||||||||||||||
| Basic loss per share | $ (0.01) | $ 0.00 | $ (0.02) | $ 0.01 | $ (0.01) | $ (0.02) | $ 0.00 | $ (0.04) | $ 0.00 | $ (0.03) | ||||||||||||||||
| Diluted loss per share | $ (0.01) | $ 0.00 | $ (0.02) | $ 0.01 | $ (0.01) | $ (0.02) | $ 0.00 | $ (0.04) | $ 0.00 | $ (0.03) | ||||||||||||||||
| Additional paid-in capital | $ 45,544 | $ 36,587 | $ 56,779 | $ 17,200 | $ 23,604 | $ 36,587 | $ 23,604 | $ 45,544 | $ 17,200 | $ 42,381 | ||||||||||||||||
| Accumulated deficit | $ (45,544) | $ (36,587) | $ (56,779) | $ (17,200) | $ (23,604) | $ (36,587) | $ (23,604) | $ (45,544) | $ (17,200) | $ (42,381) | ||||||||||||||||
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- Definition The amount of gain or loss on induced conversion of debt. No definition available.
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- Definition Interest and debt related expenses associated with non-operating financing activities of the entity, excluding gain (loss) on extinguishment of debt. No definition available.
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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of other increase (decrease) in additional paid in capital (APIC). No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Consideration given by issuer of convertible debt to provide an incentive for debt holders to convert the debt to equity securities. The expense is equal to the fair value of all securities and other consideration transferred in the transaction in excess of the fair value of securities issuable pursuant to the original conversion terms. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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