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Fair Value Measurements - Summary of changes in the fair value of warrant liabilities (Details) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended
Sep. 26, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Sep. 26, 2021
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance     $ 0   $ 0 $ 0
Change in valuation inputs or other assumptions $ 17,273,000         17,273,000
Ending balance $ 45,986,000     $ 0   45,986,000
Empower Ltd [Member]            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance     15,090,000   15,090,000 15,090,000
Change in valuation inputs or other assumptions   $ 9,706,666   1,690,000 10,143,333  
Ending balance   25,233,333   15,090,000 25,233,333  
Private Placement            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance   5,693,334 5,506,667   5,506,667 5,506,667
Change in valuation inputs or other assumptions   3,873,333 186,667      
Ending balance   9,566,667 5,693,334 5,506,667 9,566,667  
Private Placement | Empower Ltd [Member]            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance     5,506,667 0 5,506,667 5,506,667
Initial measurement       4,900,000    
Change in valuation inputs or other assumptions       606,667    
Ending balance       5,506,667    
Public            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance   9,833,333 9,583,333   9,583,333 9,583,333
Change in valuation inputs or other assumptions   5,833,333 250,000      
Ending balance   15,666,666 9,833,333 9,583,333 15,666,666  
Public | Empower Ltd [Member]            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance     9,583,333 0 9,583,333 9,583,333
Initial measurement       8,500,000    
Change in valuation inputs or other assumptions       1,083,333    
Ending balance       9,583,333    
Warrant Liabilities            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance   15,526,667 15,090,000   15,090,000 15,090,000
Change in valuation inputs or other assumptions   9,706,666 436,667      
Ending balance   $ 25,233,333 15,526,667 15,090,000 25,233,333  
Warrant Liabilities | Empower Ltd [Member]            
Disclosure Of Changes In The Fair Value Of Warrant Liabilities [Line Items]            
Beginning balance     $ 15,090,000 0 $ 15,090,000 $ 15,090,000
Initial measurement       13,400,000    
Change in valuation inputs or other assumptions       1,690,000    
Ending balance       $ 15,090,000