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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Income tax expense	$ 225	$ 2,088	$ 1,221	$ 1,922
Unrecognized tax benefits	4,700		4,700
Unrecognized tax benefits that would impact effective rate	4,400		4,400
Anticipated decrease in unrecognized tax benefits	200		200
Accrued interest and penalties	$ 500		$ 500		$ 500
Guangzhou Factory | Disposed of by Sale
Income Taxes [Line Items]
Income tax expense				$ 1,900

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[Line Items] for Income Taxes [Table]

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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