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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of the Wholly-Owned Subsidiaries of the Company Below is a summary of the wholly-owned subsidiaries of the Company with operations:
Subsidiary
 
Location
Wayfair LLC
 
U.S.
CastleGate Logistics Inc.
 
U.S.
SK Retail, Inc. 
 
U.S.
Wayfair Maine LLC
 
U.S.
Wayfair Transportation LLC
 
U.S.
Wayfair Securities Corporation
 
U.S.
Wayfair Stores Limited
 
Republic of Ireland
Wayfair (UK) Limited
 
United Kingdom
Wayfair GmbH
 
Germany
CastleGate Logistics Canada Inc.
 
Canada
CastleGate Logistics Hong Kong Limited
 
Hong Kong
Wayfair (BVI) Ltd. 
 
British Virgin Islands
Schedule of Estimated Useful Lives Property Plant and Equipment Depreciation and amortization on property and equipment is calculated on the straight-line method over the estimated useful lives of the assets as follows:
Class
 
Range of Life
(In Years)
Furniture and computer equipment
 
3 to 7
Site and software development costs
 
2
Leasehold improvements
 
The lesser of useful life or lease term
Buildings (leased - Note 6)
 
30
Schedule of Adoption of ASU 2016-02
Adoption of ASU 2016-02 resulted in the following adjustments to the Consolidated Balance Sheet:
 
 
December 31, 2018
 
ASU 2016-02 Adjustments
 
January 1, 2019
 
 
(in thousands)
Balance sheet line item:
 
 
 
 
 
 
Property and equipment, net
 
$
606,977

 
$
(227,709
)
 
$
379,268

Operating lease right-of-use assets
 
$
—

 
$
524,082

 
$
524,082

Other noncurrent assets
 
$
18,826

 
$
(6,814
)
 
$
12,012

Other liabilities
 
$
160,388

 
$
(155,996
)
 
$
4,392

Other current liabilities
 
$
127,995

 
$
(9,624
)
 
$
118,371

Lease financing obligations, net of current portion
 
$
183,056

 
$
(183,056
)
 
$
—

Operating lease liabilities
 
$
—

 
$
636,385

 
$
636,385

Accumulated deficit
 
$
(1,082,689
)
 
$
1,850

 
$
(1,080,839
)
Summary of Subsidiaries' Functional Currencies
The functional currency of the Company is the U.S. dollar, while the functional currency of certain wholly-owned subsidiaries outside of the U.S. is as follows:
Subsidiary
 
Currency
Wayfair Stores Limited
 
Euro
Wayfair GmbH
 
Euro
Wayfair (BVI) Ltd. 
 
Euro
Wayfair (UK) Limited
 
Pound sterling
CastleGate Logistics Canada Inc.
 
Canadian dollar
CastleGate Logistics Hong Kong Limited
 
Hong Kong dollar