Summary of Significant Accounting Policies - Summary of the impact by financial statement line item of corrections - Equity statement (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Nov. 30, 2021 |
Aug. 31, 2021 |
Feb. 28, 2021 |
Nov. 30, 2020 |
Aug. 31, 2020 |
Nov. 30, 2021 |
Nov. 30, 2020 |
Feb. 28, 2021 |
May 31, 2021 |
May 31, 2020 |
May 31, 2019 |
|
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | $ 528 | $ 5,360 | $ 4,217 | $ 3,345 | $ 13,922 | ||||||
| Net loss | $ (36,604) | (31,458) | (45,206) | (35,425) | (30,832) | $ (68,062) | $ (66,257) | $ (111,463) | (157,230) | $ (139,936) | $ (60,719) |
| Balance | (12,696) | (25,193) | (15,795) | (6,534) | 2,768 | (12,696) | (6,534) | (15,795) | (21,018) | (2,481) | |
| Additional Paid-in Capital | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | 528 | 5,360 | 4,217 | 3,345 | 13,922 | ||||||
| Balance | 589,971 | 540,481 | 472,029 | 435,512 | 408,994 | 589,971 | 435,512 | 472,029 | 512,796 | 372,301 | |
| Accumulated Deficit | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Net loss | (36,604) | (31,458) | (45,206) | (35,425) | (30,832) | (157,230) | |||||
| Balance | $ (603,353) | (566,318) | (488,253) | (442,636) | (406,796) | $ (603,353) | (442,636) | (488,253) | (534,440) | (375,301) | |
| Previously Reported [Member] | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | 9 | 4,139 | 3,758 | 3,345 | 11,366 | ||||||
| Net loss | (30,939) | (43,985) | (34,966) | (30,832) | (65,798) | (109,783) | (154,674) | (124,403) | (56,187) | ||
| Balance | (25,193) | (15,795) | (6,534) | 2,768 | (6,534) | (15,795) | (21,018) | ||||
| Previously Reported [Member] | Additional Paid-in Capital | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | 9 | 4,139 | 3,758 | 3,345 | 11,366 | ||||||
| Balance | 516,816 | 449,759 | 414,463 | 388,404 | 414,463 | 449,759 | 489,650 | ||||
| Previously Reported [Member] | Accumulated Deficit | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Net loss | (30,939) | (43,985) | (34,966) | (30,832) | (154,674) | ||||||
| Balance | (542,653) | (465,983) | (421,587) | (386,206) | (421,587) | (465,983) | (511,294) | ||||
| Revision of Prior Period, Adjustment [Member] | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | 519 | 1,221 | 459 | 2,556 | |||||||
| Net loss | (519) | (1,221) | (459) | (459) | (1,680) | (2,556) | $ (15,533) | $ (4,532) | |||
| Revision of Prior Period, Adjustment [Member] | Additional Paid-in Capital | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Inducement interest expense related to private warrant exchange | 519 | 1,221 | 459 | 2,556 | |||||||
| Balance | 23,665 | 22,270 | 21,049 | 20,590 | 21,049 | 22,270 | 23,146 | ||||
| Revision of Prior Period, Adjustment [Member] | Accumulated Deficit | |||||||||||
| Summary Of Significant Accounting Policies [Line Items] | |||||||||||
| Net loss | (519) | (1,221) | (459) | (2,556) | |||||||
| Balance | $ (23,665) | $ (22,270) | $ (21,049) | $ (20,590) | $ (21,049) | $ (22,270) | $ (23,146) | ||||