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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021
Fair Value Measurements |  |
Schedule of company's assets and liabilities that are measured at fair value on a recurring basis | The following table presents information about the Company’s assets and liabilities that are measured on a recurring basis as of December 31, 2020 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measured as of December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Investments held in Trust Account | ​ | $ | 414,020,525 | ​ | $ | — | ​ | $ | — | ​ | $ | 414,020,525
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Derivative liabilities (Restated) | ​ | $ | — | ​ | $ | — | ​ | $ | 40,532,280 | ​ | $ | 40,532,280
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measured as of June 30, 2021
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments held in Trust Account | ​ | $ | 414,090,409 | ​ | $ | — | ​ | $ | — | ​ | $ | 414,090,409
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative liabilities - public warrants | ​ | ​ | 13,151,400 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 13,151,400
Derivative liabilities - private placement warrants | ​ | ​ | — | ​ | ​ | 7,039,490 | ​ | ​ | — | ​ | ​ | 7,039,490
Derivative liabilities - forward purchase agreement | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 598,630 | ​ | ​ | 598,630
Total liabilities | ​ | $ | 13,151,400 | ​ | $ | 7,039,490 | ​ | $ | 598,630 | ​ | $ | 20,789,520
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Fair Value Measured as of December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  | ​ |  | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ |
Investments held in Trust Account |  | $ | 414,020,525 | ​ | $ | — | ​ | $ | — | ​ | $ | 414,020,525
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative liabilities - public warrants | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 21,390,000 | ​ | ​ | 21,390,000
Derivative liabilities - private placement warrants |  | ​ | — | ​ | ​ | — |  | ​ | 11,449,330 | ​ | ​ | 11,449,330
Derivative liabilities - forward purchase agreement | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,692,950 | ​ | ​ | 7,692,950
Total liabilities |  | $ | — | ​ | $ | — | ​ | $ | 40,532,280 | ​ | $ | 40,532,280
Schedule of quantitative information regarding Level 3 fair value measurements inputs | The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of |
​ | ​ | December 15, | ​ | December 31, |
​ |  | 2020 |  | 2020 |
Share price | ​ | $ | 9.81 | ​ | $ | 10.02 | ​
Exercise price | ​ | $ | 11.50 | ​ | $ | 11.50 | ​
Term (in years) | ​ |  | 6.00 | ​ |  | 6.00 | ​
Volatility | ​ |  | 20.50 | % |  | 21.00 | %
Risk-free interest rate | ​ |  | 0.51 | % |  | 0.50 | %
Expected dividends | ​ |  | 0.00 | % |  | 0.00 | %
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of | ​ | As of |
​ |  | June 30, 2021 |  | March 31, 2021 |  | December 31, 2020 | ​
Share price, used in warrant valuations |  | ​ | n/a | ​ | ​ | n/a | ​ | $ | 10.02 | ​
Unit price, used in forward valuation | ​ | $ | 10.04 | ​ | $ | 10.05 | ​ | $ | 10.54 | ​
Exercise price, warrants | ​ | ​ | n/a | ​ | ​ | n/a | ​ | $ | 11.50 | ​
Exercise price, forward | ​ | $ | 10.00 | ​ | $ | 10.00 | ​ | $ | 10.00 | ​
Term (in years), used in warrant valuations | ​ | ​ | n/a | ​ | ​ | n/a | ​ | ​ | 6.00 | ​
Term (in years), used in forward valuation | ​ | ​ | 0.46 | ​ | ​ | 0.71 | ​ | ​ | 0.96 | ​
Volatility | ​ | ​ | n/a | ​ | ​ | n/a | ​ | ​ | 21.00 | %
Risk-free interest rate, used in warrant valuations | ​ | ​ | n/a | ​ | ​ | n/a | ​ | ​ | 0.50 | %
Risk-free interest rate, used in forward valuation | ​ | ​ | 0.06 | % | ​ | 0.06 | % | ​ | 0.10 | %
Expected dividends | ​ | ​ | n/a | ​ | ​ | n/a | ​ | ​ | n/a | ​
Schedule of change in the fair value of the derivative liabilities | A reconciliation of the beginning and ending balances of the derivative assets and liabilities is summarized below:
​ | ​ | ​ | ​
Beginning of period |  | $ | —
Acquisition date fair value of derivative liabilities: | ​ |  |
Public warrants issued in the initial public offering | ​ |  | 19,458,000
Private placement warrants issued in connection with the initial public offering (1) | ​ |  | 10,415,200
Forward Purchase Agreement liability (2) | ​ |  | 4,045,920
Total acquisition date fair value of derivative liabilities | ​ |  | 33,919,120
Change in fair value of warrant liabilities - Public | ​ |  | 1,932,000
Change in fair value of warrant liabilities - Private | ​ |  | 1,034,130
Change in fair value of forward purchase agreement | ​ |  | 3,647,030
End of period | ​ | $ | 40,532,280
The change in the fair value of derivative liabilities measured using Level 3 inputs for the period from September 28, 2020 (inception) through December 31, 2020 is summarized as follows: ​
​ | ​ | ​ | ​
Level 3 derivative liabilities at December 15, 2020 |  | ​ |
Issuance of Public, Private Warrants | ​ | $ | 29,873,200
Change in fair value of derivative liabilities | ​ |  | 10,659,080
Level 3 derivative liabilities at December 31, 2020 | ​ | $ | 40,532,280
| ​
​ | ​ | ​ | ​
Beginning of period |  | ​ |
Warrant Liabilities - Public | ​ | $ | 21,390,000
Warrant Liabilities - Private | ​ |  | 11,449,330
Forward Purchase agreement | ​ |  | 7,692,950
Beginning of period total | ​ | $ | 40,532,280
Change in fair value of warrant liabilities – Public | ​ |  | (8,238,600)
Change in fair value of warrant liabilities – Private | ​ |  | (4,409,840)
Change in fair value of forward purchase agreement | ​ |  | (7,094,320)
End of period | ​ | $ | 20,789,520
​
​ | ​ | ​ | ​
Level 3 derivative liabilities at December 31, 2020 |  | $ | 40,532,280
Transfers from Level 3 | ​ | ​ | (32,839,330)
Change in fair value | ​ | ​ | (6,935,120)
Level 3 derivative liabilities at March 31, 2021 | ​ | $ | 757,830
Change in fair value | ​ | ​ | (159,200)
Level 3 derivative liabilities at June 30, 2021 | ​ | $ | 598,630

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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