Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax Credit Carryforward [Line Items]
Income tax provision	$ 1,894	$ 1,097	$ 1,046
Pre-tax loss	$ 306,043	$ 313,989	$ 192,323
Effective income tax rate	(0.60%)	(0.30%)	(0.50%)
Valuation allowance	$ 831,597	$ 758,242
Increase in valuation allowance	73,400	69,000
Uncertain tax positions increase	9,800
Unrecognized tax benefits that would impact valuation allowance	54,100
Interest and penalties accrued	0	$ 0
Domestic Tax Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	2,100,000
Tax credit carryforwards	45,700
Domestic Tax Authority | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	39,100
Domestic Tax Authority | Investment Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	6,600
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	1,500,000
Operating loss carryforwards, subject to expiration			$ 369,500
Tax credit carryforwards	19,100
State and Local Jurisdiction | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 19,100