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Revenue - Narrative (Details) - USD ($)
6 Months Ended 9 Months Ended 15 Months Ended
Jul. 15, 2018
Sep. 30, 2019
Sep. 30, 2019
Revenue from External Customer [Line Items]      
Revenue recognized in the period   $ 7,500,000  
Marketplace revenue      
Revenue from External Customer [Line Items]      
Listing fee per item   $ 0.20  
Listing fee, term   4 months  
Fee for each completed transaction, percent 3.50%   5.00%
Marketplace revenue | Minimum      
Revenue from External Customer [Line Items]      
Reverb seller transaction fee   3.00%  
Marketplace revenue | Maximum      
Revenue from External Customer [Line Items]      
Reverb seller transaction fee   4.50%  
Pattern      
Revenue from External Customer [Line Items]      
Subscription fee per month   $ 15  
Etsy Plus      
Revenue from External Customer [Line Items]      
Subscription fee per month   $ 10  
Subscription period   30 days  
Reverb Holdings Inc. | Marketplace revenue      
Revenue from External Customer [Line Items]      
Fee for each completed transaction, percent   3.50%  
Reverb Holdings Inc. | Marketplace revenue | Minimum      
Revenue from External Customer [Line Items]      
Reverb seller transaction fee   2.50%  
Reverb Holdings Inc. | Marketplace revenue | Maximum      
Revenue from External Customer [Line Items]      
Reverb seller transaction fee   2.70%