Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 0	$ 0
State	229	371	74
Total current tax expense	229	371	74
Deferred:
Federal	(1,435)	0	0
State	(506)	0	0
Total deferred tax expense	(1,941)	0	0
Provision (benefit) for income taxes	$ (1,712)	$ 371	$ 74