Income Taxes - Benefit (Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax benefit (provision):
Federal	$ 18,513	$ 16,615	$ 13,869
State	7,082	5,802	2,170
Expiration of NOLs and R&D Credit	(14,210)	(20,294)	(18,966)
Income tax benefit (provision) before valuation allowance	11,385	2,123	(2,927)
Deferred tax valuation allowance	(11,158)	(956)	$ 2,927
Income tax benefit (provision)	$ 227	$ 1,167