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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Segment
Sep. 30, 2020
USD ($)
Accounting Policies [Abstract]        
Number of Operating Segments | Segment     1  
Number of Reportable Segments | Segment     1  
Impairment charges on property and equipment $ 0 $ 0 $ 0 $ 0
Advertising expenses 13,300 3,500 32,200 8,200
Inventory impairments $ 1,000 $ 100 $ 1,300 $ 3,000