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Goodwill and Acquired Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the six months ended June 30, 2016 are as follows (in thousands):
 
Balance as of December 31, 2015
$
45,346

Goodwill adjustments
166

Foreign currency translation adjustments
481

Balance as of June 30, 2016
$
45,993
Summary of Intangible Assets Acquired
Acquired intangible assets subject to amortization as of June 30, 2016 and December 31, 2015 consist of the following (in thousands).
 
 
As of June 30, 2016
Cost
 
Accumulated
Amortization
 
Foreign 
Currency Translation Adjustments
 
Net
 
Remaining Useful Life
 
 
 
 
 
 
 
 
(In years)
Developed technology
$
14,000

 
$
(4,849
)
 
$
(136
)
 
$
9,015

 
3.3
Customer relationships
1,800

 
(824
)
 
(36
)
 
940

 
2.6
 
$
15,800

 
$
(5,673
)
 
$
(172
)
 
$
9,955

 
 
 
 
As of December 31, 2015
Cost
 
Accumulated
Amortization
 
Foreign
Currency Translation Adjustments
 
Net
 
Remaining Useful Life
 
 
 
 
 
 
 
 
(In years)
Developed technology
$
14,000

 
$
(3,133
)
 
$
(279
)
 
$
10,587

 
3.7
Customer relationships
1,800

 
(606
)
 
(78
)
 
1,117

 
3.1
 
$
15,800

 
$
(3,739
)
 
$
(357
)
 
$
11,704

 
 
Summary of Estimated Future Amortization Expense
Estimated future amortization expense as of June 30, 2016 is as follows (in thousands):
 
Remainder of 2016
$
1,889

2017
3,357

2018
2,131

2019
2,066

2020
512

 
$
9,955