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
Income Taxes
Net deferred tax liability	$ 1,613	$ 1,613
Income tax benefit		(227)	$ (1,167)
Net operating loss carryforwards with no expiration date	374,800
Foreign pre-tax loss	0	$ 0	$ 0	$ 0	$ 0
Federal
Income Taxes
Net operating loss carryforwards	623,100
Federal | R&D credit
Income Taxes
Net operating loss carryforwards	41,400
State
Income Taxes
Net operating loss carryforwards	879,900
State | R&D credit
Income Taxes
Net operating loss carryforwards	$ 11,700