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Property and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and equipment, net as of December 31, 2018 and 2017 consists of the following:
 
 
 
December 31,
 
Estimated useful life
 
2018
 
2017
Furniture and fixtures
5-10 years
 
$
3,208

 
$
2,958

Computers and equipment
3-5 years
 
19,644

 
18,950

Software
3-6 years
 
5,432

 
5,430

Capitalized internal-use software development costs
3 years
 
8,775

 
4,102

Leasehold improvements
Shorter of lease term
or useful life
 
5,587

 
5,650

Construction in progress
 
 
20

 
19

Property and equipment, gross
 
 
42,666

 
37,109

Less: Accumulated depreciation and amortization
 
 
(27,990
)
 
(23,102
)
Property and equipment, net
 
 
$
14,676

 
$
14,007