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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer | Dec. 31, 2016 USD ($) customer
Schedule of Accounting Policies [Line Items] |  |  |
Certificates of deposit | $ 0 | $ 2,880,000 |
Investments held to maturity | 0 | 6,077,000 |
Research and development costs | 13,500,000 | 13,000,000 | $ 12,000,000
Advertising expense | 800,000 | 1,700,000 | 1,400,000
Payments to representatives | $ 47,800,000 | 51,800,000 | 55,000,000
Extended product warranties, minimum length | 6 months |  |
Extended product warranties, maximum length | 10 years |  |
Shipping and Handling |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Cost of sales | $ 12,600,000 | $ 11,400,000 | $ 10,300,000
Foreign Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 3.00% | 4.00% | 4.00%
Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | customer | 1 | 1 | 1
Accounting for More Than 5% of Accounts Receivable |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 5.00% | 5.00% |
Number of major customers | 0 | 0 |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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