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Income taxes - Provision for Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S. Federal	$ 0	$ 0	$ 0
U.S. State and Local	(38)	(6)	(2)
Foreign	(669)	(1,131)	(766)
Deferred:
U.S. Federal	0	(198)	199
U.S. State and Local	0	0	0
Foreign	736	0	0
Total tax benefit (expense)	$ 29	$ (1,335)	$ (569)

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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