Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Parenthetical) (Details) $ in Thousands  | 
 Jan. 31, 2021  
USD ($) 
 | 
|---|---|
| Prepaid Expense And Other Assets Current [Abstract] | |
| Refundable FDA filing fee received | $ 2,876 | 
| X | ||||||||||
- Definition Refundable FDA filing fee received. No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
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