Income Taxes - Reconciliation of tax expense (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory tax expense	$ (45,456)	$ (25,241)
Warrants – mark to market	545	14,552
Research and development tax credit	(1,555)	(1,170)
Change in valuation allowance	43,604	11,435
Other, net	2,862	340
Income tax expense (benefit)	$ 0	$ (84)