Income Tax - Components of income before income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ (165,160)	$ (47,911)	$ (58,985)
Foreign	591	303	820
Loss before income tax expense	$ (164,569)	$ (47,608)	$ (58,165)