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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 |  |

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