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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment consisted of the following as of the dates indicated (in thousands):
 
 
 
As of
December 31,
 
Estimated useful lives
 
2015
 
2016
Computer equipment
3 years
 
$
27,054

 
$
30,378

Furniture and equipment
2 - 4 years
 
1,959

 
5,920

Software
1 - 3 years
 
1,427

 
856

Leasehold improvements
Shorter of life of asset or lease term
 
8,097

 
10,155

Construction in progress(1)
Not applicable
 
71,106

 

Building
25 years
 

 
81,957

Website development
3 years
 
33,469

 
43,294

 
 
 
143,112

 
172,560

 
 
 
 
 
 
Less: Accumulated depreciation and amortization
 
 
38,091

 
46,153

 
 
 
$
105,021

 
$
126,407

 
(1)
The Company capitalizes construction in progress and records a corresponding long-term liability for build-to-suit lease arrangements where it is considered the owner, for accounting purposes, during the construction period. The Company completed construction on its new Brooklyn, NY headquarters in May 2016.
Summary of Capitalized Website Development and Internal-Use Software Activities
The following table summarizes capitalized website development and internal-use software activities during the periods indicated (in thousands):
 
Year Ended 
 December 31,
 
2015
 
2016
Balance as of the beginning of the period
$
31,156

 
$
33,469

Additions to website development, excluding stock-based compensation
9,719

 
11,769

Additions to website development—stock-based compensation
463

 
792

Less: Retirements
7,869

 
2,736

 
33,469

 
43,294

Less: Accumulated amortization
19,676

 
24,155

 
$
13,793

 
$
19,139