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FAIR VALUE MEASUREMENTS, Change in Level 3 Fair Value of Warrant Liabilities (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Change in fair value of warrants | $ 0 | $ (6,878,000) | $ 181,000 | $ 181,000 | $ (1,810,000) | $ (7,240,000)
Warrant Liabilities [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Level 3 Beginning balance | 0 |  |  | 0 | 0 | 0
Initial measurement on September 17, 2020 |  |  |  |  |  | 16,290,000
Change in fair value of warrants |  |  |  |  |  | 7,240,000
Level 3 Ending balance |  |  |  |  |  | 0
Warrant Liabilities [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | (14,950,000)
Warrant Liabilities [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | (8,580,000)
Warrant Liabilities [Member] | Private Placement Warrants [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Level 3 Beginning balance | 0 |  |  | 0 | 0 | 0
Initial measurement on September 17, 2020 |  |  |  |  |  | 5,940,000
Change in fair value of warrants |  |  |  |  |  | 2,640,000
Level 3 Ending balance |  |  |  |  |  | 0
Warrant Liabilities [Member] | Private Placement Warrants [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | 0
Warrant Liabilities [Member] | Private Placement Warrants [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | (8,580,000)
Warrant Liabilities [Member] | Public Warrant [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Level 3 Beginning balance | $ 0 |  |  | $ 0 | $ 0 | 0
Initial measurement on September 17, 2020 |  |  |  |  |  | 10,350,000
Change in fair value of warrants |  |  |  |  |  | 4,600,000
Level 3 Ending balance |  |  |  |  |  | 0
Warrant Liabilities [Member] | Public Warrant [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | (14,950,000)
Warrant Liabilities [Member] | Public Warrant [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Transfer from Level 3 |  |  |  |  |  | $ 0

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