Other Accrued Liabilities, Accrued Warranty Costs (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
Product Warranty Accrual [Roll Forward]
Accrual at beginning of period	$ 272	$ 195	$ 238	$ 178
Additions charged to warranty expense	75	75	143	138
Expiring warranties/claimed satisfied	(56)	(35)	(90)	(81)
Total	291	235	291	235
Less: current portion	(194)	(149)	(194)	(149)	$ (156)
Total long-term accrued warranty costs	$ 97	$ 86	$ 97	$ 86
Minimum [Member]
Accrued warranty costs [Abstract]
Standard warranty period			1 year
Offered warranty period			3 years
Maximum [Member]
Accrued warranty costs [Abstract]
Standard warranty period			2 years
Offered warranty period			4 years

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The extended product warranties, which generally require additional fees to be paid by the buyer, and other guarantee contracts excluded from the initial recognition and initial measurement requirements. Does not include disclosures for standard product warranties, which typically have substantially shorter periods of time or provide less coverage, or both.

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The product warranty, including the approximate term of the product warranty, how the product warranty arose, and the events or circumstances that would require the warrantor to perform under the product warranty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase (decrease) in the standard and extended product warranty liability.

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