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Income Taxes - Statutory united states federal income tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax provision (benefit) at statutory rate	$ 4	$ (37)
State tax expense net of federal tax benefit	66	1
Foreign taxes	24	(4)
Other	(57)	75
Foreign withholding and dividend tax		255
Change in valuation allowance		(6)
Total income tax provision (benefit)	$ (95)	$ 282
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal income tax provision (benefit) at statutory rate (in percent)	21.00%	21.00%
State tax expense net of federal tax benefit (in percent)	(366.70%)	(0.60%)
Foreign taxes (in percent)	133.30%	(2.30%)
Other (in percent)	(316.70%)	42.90%
Foreign withholding and dividend tax (in percent)		145.70%
Change in valuation allowance (in percent)		(3.40%)
Income tax provision (benefit) (in percent)	(527.80%)	(161.30%)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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