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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Stockholders' equity (deficit) $ 397,004 $ (25,507) $ (9,118)   $ (334)
Revenue recognized 2,900 2,100 1,400    
Cash collections of purchases via digital channel not yet shipped 700 700      
Gift card liabilities 3,500 2,200      
Sales-refund reserve 5,452 5,249      
Inventory returns receivable 1,351 1,376      
Net revenue 277,472 219,296 193,673    
United States          
Disaggregation of Revenue [Line Items]          
Net revenue 209,786 166,960 166,579    
International          
Disaggregation of Revenue [Line Items]          
Net revenue 67,686 52,336 27,094    
Accumulated Deficit          
Disaggregation of Revenue [Line Items]          
Stockholders' equity (deficit) $ (137,386) $ (92,016) $ (66,156)   (52,384)
Cumulative Effect, Period of Adoption, Adjustment          
Disaggregation of Revenue [Line Items]          
Stockholders' equity (deficit)         755
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit          
Disaggregation of Revenue [Line Items]          
Stockholders' equity (deficit)         $ 755
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2014-09 | Accumulated Deficit          
Disaggregation of Revenue [Line Items]          
Stockholders' equity (deficit)       $ 800