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Intangible Assets
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
The components of intangible assets were as follows (in thousands):
 
 
June 30, 2018
 
December 31, 2017
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Developed technology
 
$
2,460

 
$
(1,653
)
 
$
807

 
$
2,460

 
$
(1,478
)
 
$
982

Customer relationships
 
520

 
(489
)
 
31

 
520

 
(437
)
 
83

Domain names
 
50

 
(47
)
 
3

 
50

 
(42
)
 
8

Total
 
$
3,030

 
$
(2,189
)
 
$
841

 
$
3,030

 
$
(1,957
)
 
$
1,073

 
 
 
 
 
 
 
 
 
 
 
 
 

Amortization expense for intangible assets was $0.1 million and $0.2 million for the three and six months ended June 30, 2018, respectively, and $0.1 million and $0.2 million for each of the three and six months ended June 30, 2017, respectively.
As of June 30, 2018, the expected future amortization expense for intangible assets was as follows (in thousands):
Period
 
Expected Future Amortization Expense
2018
 
$
210

2019
 
351

2020
 
280

Total
 
$
841