Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of intangible assets
Intangible assets consisted of the following at December 31, 2015 and December 31, 2014 (in thousands, except years):
 
At December 31, 2015
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Weighted average useful life in years
Acquired technology and domain name
$
31,090

 
$
(13,835
)
 
$
17,255

 
9.70
Customer relationships
6,300

 
(3,252
)
 
3,048

 
8.97
Tradenames
4,900

 
(1,388
)
 
3,512

 
15.00
Total
$
42,290

 
$
(18,475
)
 
$
23,815

 
10.20

 
At December 31, 2014
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Weighted average useful life in years
Acquired technology and domain name
$
31,090

 
$
(10,788
)
 
$
20,302

 
9.70
Customer relationships
6,300

 
(2,491
)
 
3,809

 
8.97
Tradenames
4,900

 
(1,062
)
 
3,838

 
15.00
Total
$
42,290

 
$
(14,341
)
 
$
27,949

 
10.20
Schedule of amortization expense
Amortization expense by asset type for the years ended December 31, 2015, 2014, and 2013 is shown below (in thousands):
 
 Year Ended December 31,
 
2015
 
2014
 
2013
Acquired technology and domain name
$
3,047

 
$
3,164

 
$
3,318

Customer relationships
760

 
760

 
760

Trade names
327

 
327

 
327

Total amortization
$
4,134

 
$
4,251

 
$
4,405
Schedule of expected amortization expense with respect to intangible assets
Expected amortization expense with respect to intangible assets at December 31, 2015 for each of the five years through December 31, 2020 and thereafter is as follows (in thousands):
 
Years ended December 31,
 
2016
$
4,041

2017
3,862

2018
3,861

2019
3,791

2020
3,787

Thereafter
4,473

Total amortization expense
$
23,815