Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants - Stock to Vendors (Details)

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Offerings of Common Stock and Warrants - Stock to Vendors (Details) - Andretti Autosport 6, Inc. - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2021
Feb. 17, 2021
Feb. 10, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Offerings of Common Stock and Warrants and At-the-Market Offering Program              
Shares issued (in shares) 9,541 105,933 229,886        
Sponsorship agreement, sponsorship fee, amortization of prepaid marketing credit       $ 0.5 $ 0.8 $ 1.0 $ 0.9