Net loss per share Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 shares	Nov. 24, 2020 USD ($) $ / shares	Apr. 12, 2017 USD ($) $ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of Stock maxium percent of outstanding shares in class of total outstanding shares	10.00%
Option Indexed To Issuers Equity, cap price | $		$ 12.0925
Conversion of Stock maxium percent of outstanding shares in class of total outstanding shares	10.00%
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number | shares	1
Conversion of Stock, Shares Issued | shares	1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number | shares	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%
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 9.3285