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Property and Equipment, net (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property and equipment, net as of December 31, 2014 and 2013 consists of the following:
 
 
 
December 31,
 
Estimated useful life
 
2014
 
2013
Furniture and fixtures
7-10 years
 
$
2,874

 
$
2,423

Computers and equipment
3-5 years
 
15,662

 
10,857

Software
2-6 years
 
5,068

 
4,322

Capitalized internal-use software development costs
3 years
 
2,639

 
5,064

Leasehold improvements
Shorter of lease term
or useful life
 
5,625

 
4,568

Construction in progress
 
 
5

 
305

Property and equipment, gross
 
 
31,873

 
27,539

Less: Accumulated depreciation and amortization
 
 
(16,085
)
 
(11,952
)
Property and equipment, net
 
 
$
15,788

 
$
15,587