Derivative Warrant Liabilities (Details)		6 Months Ended
Derivative Warrant Liabilities (Details)	Aug. 25, 2020 $ / shares	Jun. 30, 2021 $ / shares	Jun. 30, 2021 $ / shares	Jun. 30, 2021 $ / shares	Jun. 30, 2021 D $ / shares	Jun. 30, 2021 item $ / shares
Class of Warrant or Right [Line Items]
Period for filling registration statement after business combination		15 days
Period of time after which warrant holder may do cashless exercise		60 days
Redemption of Warrants When the Price per Share of Class A Common Stock Equals or Exceeds $10.00
Class of Warrant or Right [Line Items]
Redemption price per public warrant (in dollars per share)			$ 0.10
Private Placement
Class of Warrant or Right [Line Items]
Threshold period for not to transfer, assign or sell any of their shares or warrants after the completion of the initial business combination	30 days	30 days
Exercise price of warrant	$ 11.50
Redeemable warrants
Class of Warrant or Right [Line Items]
Public Warrants exercisable term after the completion of a business combination		30 days
Public Warrants exercisable term from the closing of the initial public offering		12 months
Public Warrants expiration term		5 years	5 years	5 years	5 years	5 years
Fair market value per share			$ 0.361
Number of trading days on which fair market value of shares is reported					10	10
Threshold issue price per share			9.20
Percentage of gross proceeds on total equity proceeds				60.00%
Adjustment of exercise price of warrants based on market value and newly issued price (as a percent)				115.00%
Adjustment of redemption price of stock based on market value and newly issued price (as a percent)				180.00%
Exercise price of warrant		$ 11.50	11.50	$ 11.50	$ 11.50	$ 11.50
Redeemable warrants \| Redemption of Warrants When the Price per Share of Class A Common Stock Equals or Exceeds $18.00
Class of Warrant or Right [Line Items]
Stock price trigger for redemption of public warrants (in dollars per share)			18.00
Redemption price per public warrant (in dollars per share)			0.01
Minimum threshold written notice period for redemption of public warrants		30 days
Threshold trading days for redemption of public warrants \| item						20
Threshold business days before sending notice of redemption to warrant holders		30 days
Redeemable warrants \| Redemption of Warrants When the Price per Share of Class A Common Stock Equals or Exceeds $10.00
Class of Warrant or Right [Line Items]
Stock price trigger for redemption of public warrants (in dollars per share)			10.00
Minimum threshold written notice period for redemption of public warrants		30 days
Threshold trading days for redemption of public warrants \| item						20
Threshold consecutive trading days for redemption of public warrants \| item						3
Threshold business days before sending notice of redemption to warrant holders		30 days
Redeemable warrants \| Redemption of Warrants When the Price per Share of Class A Common Stock Equals less than $10.00
Class of Warrant or Right [Line Items]
Stock price trigger for redemption of public warrants (in dollars per share)			$ 18.00
Threshold trading days for redemption of public warrants \| item						20
Threshold business days before sending notice of redemption to warrant holders		30 days

Horizon Acquisition Corp 10-Q