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Summary of Significant Accounting Policies - Schedule of basic and diluted loss per common share (Detail) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2021
Jun. 30, 2021
Jun. 27, 2021
Mar. 31, 2021
Mar. 28, 2021
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 31, 2020
Jun. 30, 2021
Sep. 26, 2021
Sep. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                              
Net loss $ (30,200,000)   $ 23,098,000   $ (2,056,000) $ 13,543,000 $ 12,509,000 $ 4,852,000     $ (9,158,000) $ 30,904,000 $ 32,857,000 $ 561,000 $ (30,613,000)
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding 106,285,072         67,673,884         80,735,661 67,673,884 67,673,884 67,673,884 67,673,884
Empower Ltd [Member]                              
Numerator:                              
Net loss   $ (12,859,424)   $ (3,017,488)         $ (4,443,894) $ (15,876,912)          
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding   6,250,000             6,250,000 6,250,000          
Basic and diluted net loss per ordinary share   $ (0.41)             $ (0.20) $ (0.51)          
Common Stock Subject to Possible Redemption [Member] | Empower Ltd [Member]                              
Numerator: Earnings allocable to Ordinary shares subject to possible redemption                              
Less: Income taxes and franchise fees                 $ 0            
Net Income allocable to shares subject to redemption                 46,642            
Numerator: Earnings allocable to Common stock subject to possible redemption Interest earned on marketable securities held in Trust Account                 46,642            
Numerator:                              
Net loss                 (4,443,894)            
Net earnings allocable to Common stock subject to possible redemption                 $ 46,642            
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding                 22,435,483            
Basic and diluted net loss per ordinary share                 $ 0.00            
Non Redeemable Common Stock [Member] | Empower Ltd [Member]                              
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding                 7,850,413            
Basic and diluted net loss per ordinary share                 $ (0.58)            
Non-Redeemable Net Loss Denominator: Weighted Average Non-Redeemable Common Stock                 (4,490,536)            
Common Class A [Member] | Empower Ltd [Member] | Second Amendment [Member]                              
Numerator:                              
Allocation of net loss, as adjusted   $ (10,287,539,000)             $ (3,172,845) $ (12,701,530,000)          
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding   25,000,000               25,000,000          
Basic and diluted net loss per ordinary share   $ (0.41)               $ (0.51)          
Common Class A [Member] | Common Stock Subject to Possible Redemption [Member] | Empower Ltd [Member] | Second Amendment [Member]                              
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding                 15,601,504            
Basic and diluted net loss per ordinary share                 $ (0.20)            
Common Class B [Member] | Empower Ltd [Member] | Second Amendment [Member]                              
Numerator:                              
Allocation of net loss, as adjusted   $ (2,571,885,000)             $ (1,271,049) $ (3,175,382,000)          
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding   6,250,000               6,250,000          
Basic and diluted net loss per ordinary share   $ (0.41)               $ (0.51)          
Common Class B [Member] | Non Redeemable Common Stock [Member] | Empower Ltd [Member] | Second Amendment [Member]                              
Denominator: Weighted Average                              
Basic and diluted weighted average shares outstanding                 6,250,000            
Basic and diluted net loss per ordinary share                 $ (0.20)