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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Summary of Significant Accounting Policies (Details) [Line Items]        
Business combination, description   Pursuant to the Business Combination described in Note 3—Business Combination, Purple Inc. acquired approximately 18% of the common units of Purple LLC, while InnoHold, LLC (“InnoHold”) retained approximately 82% of the common units in Purple LLC. As of December 31, 2020, Purple Inc. held approximately 99% of the common units of Purple LLC and other Purple LLC Class B Unit holders held approximately 1% of the common units in Purple LLC.    
Inventory obsolescence   $ 500 $ 800  
Impairment charge $ 600 600    
Advertising expense   130,300 112,100  
Accrued sales return   8,428 7,271  
Warranty liabilities current   2,800 1,600  
Warranty liabilities   $ 5,600 3,100  
Tax receivable agreement, percentage   80.00%    
Estimation of liability under the tax receivable agreement description   The estimation of liability under the Tax Receivable Agreement is by its nature imprecise and subject to significant assumptions regarding the amount and timing of future taxable income. As a result of the Business Combination, subsequent exchanges of 43.5 million Class B Units for Class A Stock and changes in estimates relating to the expected tax benefits associated with the Tax Receivable Agreement, the Company increased the Tax Receivable Agreement liability from $0.5 million at December 31, 2019 to $172.0 million at December 31, 2020. Of the total liability recorded during 2020, $137.3 million relates to current year exchanges and was recorded as an adjustment to equity and $34.2 million was recorded to expense in order to re-establish the TRA related to prior year exchanges.    
Operating lease right-of-use assets   $ 41,408 $ 27,900
Operating lease liability current   $ 3,235 33,000
Deferred rent and lease incentives       $ 5,100
Minimum [Member]        
Summary of Significant Accounting Policies (Details) [Line Items]        
Property and Equipment, estimated useful lives   1 year    
Estimated lives of intangible   3 years    
Stock awards vesting period   3 years    
Maximum [Member]        
Summary of Significant Accounting Policies (Details) [Line Items]        
Property and Equipment, estimated useful lives   16 years    
Estimated lives of intangible   15 years    
Stock awards vesting period   4 years    
InnoHold [Member]        
Summary of Significant Accounting Policies (Details) [Line Items]        
Tax receivable agreement, percentage   80.00%