Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Operating Loss Carryforwards [Line Items]
Percentage of valuation allowance against deferred tax assets	100.00%
Increase in deferred tax assets valuation allowance	$ 3,900	$ 2,800
Income tax expense	810	0
New York State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income	191,100
New York City
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income	175,300
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	295,700	301,100
Operating loss carryforwards, annual limitation	28
Operating loss carryforwards net, expected to expire unutilized and unavailable to offset future federal taxable income	194,600
Operating loss carryforwards available for offset future taxable income	101,100
Operating loss carryforwards for unlimited period	99,600
Federal | Research and Development Tax Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	9,200	8,100
Tax credit carryforwards expected to expire unutilized	4,100
Federal | Expire Between 2019 and 2037
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards available for offset future taxable income	1,500
State | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	100
State | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	200,200
City | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		600
City | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		200,200
State:
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,000	4,900
Income tax expense	748
Foreign:
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 47,000	$ 40,300