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Summary of Significant Accounting Policies, Product Warranty and Overstock Returns and Accounting for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Product Warranty and Overstock Returns [Abstract] |  |
Product warranty period | 90 days |
Accounting for Income Taxes [Abstract] |  |
Valuation allowance | $ 757 | $ 399
Net deferred tax asset | $ 37,272 | $ 42,334

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- Definition Refers to the product warranty period in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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