Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	9 Months Ended
Sep. 30, 2021 USD ($) segment	Sep. 30, 2020	Dec. 31, 2020 USD ($)
Concentration Risk [Line Items]
Number of operating segments \| segment	1
Cash and cash equivalents	$ 266,237		$ 314,085
Finished goods	12,000		8,900
Component parts	39,400		29,600
Allowance for returns	2,000		1,900
Credit Card Receivable
Concentration Risk [Line Items]
Cash and cash equivalents	$ 3,400		$ 7,100
Cost of Goods and Service Benchmark \| Supplier Concentration Risk \| Top Five Inventory Suppliers
Concentration Risk [Line Items]
Concentration risk percent	23.00%	22.00%

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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