Description of the business - Narrative (Detail) $ in Thousands, shares in Millions				1 Months Ended						6 Months Ended	12 Months Ended
	Mar. 15, 2024 USD ($) tranche	Dec. 22, 2023 USD ($)	Dec. 19, 2023 shares	Dec. 31, 2023 USD ($) shares	Oct. 31, 2023 shares	Aug. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Apr. 30, 2022	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares
Asset Acquisition, Contingent Consideration [Line Items]
Accumulated deficit				$ 4,260,328							$ 4,260,328	$ 4,048,415
Net loss from continuing operations											211,900
Net cash used in operating activities											235,046	316,219
Cash and cash equivalents				221,755							$ 221,755	113,006
Secured Debt | Term Loan Facility | Line of Credit | Subsequent Event
Asset Acquisition, Contingent Consideration [Line Items]
Number of tranches | tranche	4
Debt term	5 years
Line of credit maximum borrowing capacity	$ 175,000
Private Placement
Asset Acquisition, Contingent Consideration [Line Items]
Proceeds from stock offering									$ 75,000			$ 56,200
Percentage of gross proceeds							3.00%
Number of shares issued in transaction (in shares) | shares					2.3				2.3			10.7
At The Market Offering
Asset Acquisition, Contingent Consideration [Line Items]
Value of shares available for issue						$ 125,000
December Underwriting Agreement
Asset Acquisition, Contingent Consideration [Line Items]
Proceeds from stock offering		$ 118,100		$ 118,100
Number of shares issued in transaction (in shares) | shares			83.3	83.3
Maximum | Private Placement
Asset Acquisition, Contingent Consideration [Line Items]
Proceeds from stock offering							$ 75,000
April 2022 Reduction
Asset Acquisition, Contingent Consideration [Line Items]
Plans to reduce workforce, as a percent								30.00%		30.00%