Subsequent events (Details)				1 Months Ended	2 Months Ended	6 Months Ended	12 Months Ended
	Apr. 04, 2024 USD ($)	Mar. 18, 2024 USD ($) tranche	Mar. 15, 2024 USD ($)	Aug. 31, 2021 USD ($) $ / shares shares	Mar. 14, 2024 USD ($) $ / shares shares	Dec. 29, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Apr. 16, 2024 USD ($)	Mar. 05, 2024 shares	Sep. 29, 2023 shares	Jul. 10, 2023 USD ($)	Dec. 31, 2020 USD ($)	Oct. 29, 2020 shares
Subsequent Event [Line Items]
Cash and cash equivalents							$ 325,452,000	$ 736,549,000	$ 1,202,439,000					$ 991,158,000
Restricted cash							70,447,000	0	0
Proceeds from issuance of convertible notes							$ 450,000,000	$ 0	$ 667,500,000
Common Class A
Subsequent Event [Line Items]
Common stock, authorized (in shares) | shares							1,250,000,000	1,250,000,000				1,250,000,000			750,000,000
Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes
Subsequent Event [Line Items]
Converted instrument, amount						$ 145,500,000	$ 213,400,000
Stock issuance costs and redemption payments (in shares) | shares						106,129,828
Debt issued													$ 340,000,000
Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes | Minimum
Subsequent Event [Line Items]
Debt instrument initial conversion price (in dollars per share) | $ / shares						$ 1.17
Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes | Maximum
Subsequent Event [Line Items]
Debt instrument initial conversion price (in dollars per share) | $ / shares						$ 5.57
Convertible Senior Notes Due 2026 | Common Class A
Subsequent Event [Line Items]
Stock issuance costs and redemption payments (in shares) | shares				0.0507743
Convertible Senior Notes Due 2026 | 2025 senior secured convertible notes
Subsequent Event [Line Items]
Debt instrument initial conversion price (in dollars per share) | $ / shares				$ 19.70
Debt issued				$ 667,500,000
Proceeds from issuance of notes				$ 562,200,000
Subsequent Event
Subsequent Event [Line Items]
Cash and cash equivalents										$ 53,900,000
Restricted cash										$ 11,200,000
Forbearance fee	$ 500,000
Subsequent Event | Minimum | Common Class A
Subsequent Event [Line Items]
Common stock, authorized (in shares) | shares											1,250,000,000
Subsequent Event | Maximum | Common Class A
Subsequent Event [Line Items]
Common stock, authorized (in shares) | shares											2,000,000,000
Subsequent Event | Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes
Subsequent Event [Line Items]
Converted instrument, amount					$ 181,500,000
Stock issuance costs and redemption payments (in shares) | shares					1,039,773,708
Subsequent Event | Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes | Minimum
Subsequent Event [Line Items]
Debt instrument initial conversion price (in dollars per share) | $ / shares					$ 0.01
Subsequent Event | Convertible Senior Notes Due 2025 | 2025 senior secured convertible notes | Maximum
Subsequent Event [Line Items]
Debt instrument initial conversion price (in dollars per share) | $ / shares					$ 1.23
Subsequent Event | Convertible Senior Notes Due 2024 | 2025 senior secured convertible notes
Subsequent Event [Line Items]
Debt issued		$ 166,700,000
Debt original issue discount rate		10.00%
Proceeds from issuance of notes		$ 150,000,000
Number of tranches | tranche		4
Proceeds from issuance of convertible notes		$ 35,000,000
Debt instrument, term (in years)		3 months
Subsequent Event | Convertible Senior Notes Due 2024 | 2025 senior secured convertible notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Basis spread on variable rate		12.00%
Subsequent Event | Convertible Senior Notes Due 2024 | 2025 senior secured convertible notes | Secured Overnight Financing Rate (SOFR)
Subsequent Event [Line Items]
Basis spread on variable rate		4.00%
Subsequent Event | Convertible Senior Notes Due 2026 | 2025 senior secured convertible notes
Subsequent Event [Line Items]
Accrued interest to be paid			$ 8,400,000