Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of the impact by financial statement line item of corrections - Equity statement (Details)

v3.21.4
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)