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Product Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Product Warranty
Product warranty period	1 year
Changes in standard product warranty liability
Balance at January 1 (beginning of year)	$ 5,091	$ 4,502	$ 2,666
Warranties issued during the period	3,615	5,421	5,671
Settlements made during the period	(5,548)	(5,903)	(2,603)
Changes in estimate of liability for pre-existing warranties during the period	86	1,071	(1,232)
Balance at December 31 (end of period)	3,244	5,091	4,502
Product warranty classification
Amount classified as current				$ 2,759	$ 4,819	$ 4,112
Amount classified as long-term				485	272	390
Total warranty liability	$ 3,244	$ 5,091	$ 4,502	$ 3,244	$ 5,091	$ 4,502

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- Definition

Represents the period for which the warranty is offered for the products sold.

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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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