Segment and Enterprise-Wide Disclosures (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Net Sales to Unaffiliated Customers by Geography

Net sales to unaffiliated customers by country were as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(in thousands)				(in thousands)
United States	$	14,864	$	14,932	$	29,684	$	28,979
Germany		3,257		2,854		6,364		5,739
Other countries		8,899		7,967		16,966		15,174
Net Sales	$	27,020	$	25,753	$	53,014	$	49,892