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Significant Accounting Policies - Summary of Sales Return Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Beginning balance $ 44,024 $ 28,336 $ 25,602 $ 35,104
Returns (254,974) (124,142) (602,232) (383,316)
Provisions 261,792 119,167 627,472 371,573
Ending balance $ 50,842 $ 23,361 $ 50,842 $ 23,361