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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) customer numberOfEntities | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer
Schedule of Accounting Policies [Line Items] |  |  |
Number of Veriable Interes Entities | numberOfEntities | 2 |  |
Certificates of deposit | $ 0 | $ 0 |
Investments held to maturity | 0 | 0 |
Research and development costs | 17,400,000 | 14,800,000 | $ 13,500,000
Advertising expense | 800,000 | 800,000 | 800,000
Cost of sales | $ 358,702,000 | 349,908,000 | 330,414,000
Vesting percentage | 20.00% |  |
Payments to representatives | $ 50,000,000.0 | 46,100,000 | 47,800,000
Extended product warranties, minimum length | 6 months |  |
Extended product warranties, maximum length | 10 years |  |
Minimum |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Requisite service period | 1 year |  |
Shipping and Handling |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Cost of sales | $ 14,300,000 | $ 14,400,000 | $ 12,600,000
Foreign Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 2.00% | 3.00% | 3.00%
Sales Revenue, Net |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | customer | 1 | 1 | 1
Accounts Receivable |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | customer | 2 | 1,000,000 |

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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=120391452&loc=d3e13212-122682 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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