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Income Tax - Significant components of the provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current income tax benefit:
Federal United States	$ 0	$ (215)
State - United States	0	2
Non-United States	0	0
Total	0	(213)
Federal - United States	0	0
State - United States	0	0
Non-United States	0	0
Total deferred tax	0	0
Total income tax benefit	$ 0	$ (213)

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