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Income taxes - Provision for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. Federal	$ 0	$ 0	$ 0
U.S. State and Local	(24,984)	(61)	(38)
Foreign	(4,372)	(2,041)	(669)
Deferred:
U.S. Federal	0	0	0
U.S. State and Local	(5,872)	(8,812)	0
Foreign	0	(736)	736
Total tax benefit (expense)	$ (35,228)	$ (11,650)	$ 29

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