Income Taxes - Deferred Tax Asset Valuation Allowance Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Asset, Valuation Allowance [Roll Forward]
Balance at beginning of period	$ 21,338	$ 24,307	$ 126,321
Net change in valuation allowance	(2,969)	(102,014)
Balance at end of period	$ 21,338	$ 24,307