Income Taxes - Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2023
Income Taxes
Net deferred tax liability	$ 1,613					$ 1,613
Income tax benefit		$ (227)
Net operating loss carryforwards with no expiration date						442,200
Foreign pre-tax loss	$ 0	$ 0	$ 0	$ 0	$ 0
Federal
Income Taxes
Net operating loss carryforwards						618,400
Federal | R&D credit
Income Taxes
Net operating loss carryforwards						46,700
State
Income Taxes
Net operating loss carryforwards						1,000,000
State | R&D credit
Income Taxes
Net operating loss carryforwards						$ 12,900