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Fair Value Measurements - Summary of warrants (Detail) - USD ($) | 3 Months Ended | 5 Months Ended | 8 Months Ended | 11 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value as of beginning | $ 53,594,000 | $ 36,039,600 |  |  |  |
Change in fair value | (8,467,400) | 619,600 | $ 1,342,000 | $ 1,342,000 | $ 1,961,600 | $ 18,896,400
Fair value as of ending | 45,126,600 | $ 36,659,200 | $ 36,039,600 | 36,039,600 | 36,659,200 | 53,594,000
Warrant |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value as of beginning | 53,594,000 |  |  | 0 | 0 | 0
Initial measurement on June 11, 2020 |  |  |  |  |  | 34,697,600
Change in fair value | (8,467,400) |  |  |  |  | 18,896,400
Fair value as of ending | 45,126,600 |  |  |  |  | 53,594,000
Warrant | Private Placement Warrant [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value as of beginning | 17,990,000 |  |  | 0 | 0 | 0
Initial measurement on June 11, 2020 |  |  |  |  |  | 10,280,000
Change in fair value | (2,878,400) |  |  |  |  | 6,476,400
Fair value as of ending | 15,111,600 |  |  |  |  | 17,990,000
Warrant | Public Warrant [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value as of beginning | 35,604,000 |  |  | $ 0 | $ 0 | 0
Initial measurement on June 11, 2020 |  |  |  |  |  | 20,700,000
Change in fair value | (5,589,000) |  |  |  |  | 12,420,000
Fair value as of ending | 30,015,000 |  |  |  |  | 35,604,000
FPA Liability [Member] | Private Placement Warrant [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value as of beginning | 4,225,000 |  |  |  |  |
Initial measurement on June 11, 2020 |  |  |  |  |  | 350,000
Change in fair value | (2,575,000) |  |  |  |  | 3,875,000
Fair value as of ending | $ 1,650,000 |  |  |  |  | $ 4,225,000

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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