Net loss per share Additional Information (Details)		3 Months Ended	12 Months Ended
	Nov. 24, 2020 USD ($) shares $ / shares	Dec. 31, 2021 shares	Dec. 31, 2022 shares	Dec. 31, 2021 shares	Apr. 12, 2017 USD ($) $ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Shares Acquired, Estimated, Prepaid Forward		9,200,000		9,200,000
Option Indexed To Issuers Equity, cap price | $	$ 12.0925
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number			1
Conversion of Stock, Shares Issued			1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number			10
Convertible Senior Notes due 2022 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument | $					$ 175,000,000
Interest rate					3.50%
Debt Instrument, Convertible, Conversion Price | $ / shares					$ 10.64
Convertible Senior Notes due 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument | $	$ 143,800,000
Interest rate	1.25%
Maximum number of shares issuable upon conversion of the notes	20,800,000
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 9.3285