Revenue Data by Customer Type (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($) distribution_channel	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) distribution_channel	Sep. 30, 2018 USD ($)
Revenue, Major Customer [Line Items]
Net sales	$ 88,863	$ 86,959	$ 222,855	$ 266,525
Number of primary distribution channels \| distribution_channel	2		2
Direct Customers
Revenue, Major Customer [Line Items]
Net sales	$ 84,264	83,545	$ 214,014	255,351
Distributors
Revenue, Major Customer [Line Items]
Net sales	$ 4,599	$ 3,414	$ 8,841	$ 11,174

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration