Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Office furniture and equipment | Minimum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	3 years
Office furniture and equipment | Maximum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	10 years
Delivery equipment | Minimum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	3 years
Delivery equipment | Maximum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	10 years
Warehouse equipment | Minimum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	5 years
Warehouse equipment | Maximum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	15 years
Leasehold improvements | Minimum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	3 years
Leasehold improvements | Maximum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	25 years
Buildings | Minimum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	15 years
Buildings | Maximum
Summary of Significant Accounting Policies [Line Items]
Fixed assets useful lives	25 years