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Goodwill and Acquired Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets
Note 4. Goodwill and Acquired Intangible Assets
The changes in the carrying amount of goodwill for the three months ended March 31, 2017 are as follows (in thousands):
 
Balance as of December 31, 2016
$
45,347

Foreign currency translation adjustments
297

Balance as of March 31, 2017
$
45,644


 
Acquired intangible assets subject to amortization as of March 31, 2017 and December 31, 2016 consist of the following (in thousands):
 
 
As of March 31, 2017
Cost
 
Accumulated
Amortization
 
Foreign 
Currency Translation Adjustments
 
Net
 
Remaining Useful Life
 
 
 
 
 
 
 
 
(In years)
Developed technology
$
14,000

 
$
(7,433
)
 
$
(122
)
 
$
6,445

 
2.8
Customer relationships
1,800

 
(1,151
)
 
(39
)
 
610

 
2.1
 
$
15,800

 
$
(8,584
)
 
$
(161
)
 
$
7,055

 
 
 
 
As of December 31, 2016
Cost
 
Accumulated
Amortization
 
Foreign
Currency Translation Adjustments
 
Net
 
Remaining Useful Life
 
 
 
 
 
 
 
 
(In years)
Developed technology
$
14,000

 
$
(6,584
)
 
$
(169
)
 
$
7,247

 
2.9
Customer relationships
1,800

 
(1,044
)
 
(53
)
 
703

 
2.3
 
$
15,800

 
$
(7,628
)
 
$
(222
)
 
$
7,950

 
 

 
Amortization expense of acquired intangible assets for each of the three months ended March 31, 2017 and 2016 was $0.9 million.  
Estimated future amortization expense as of March 31, 2017 is as follows (in thousands):
 
Remainder of 2017
$
2,349

2018
2,128

2019
2,066

2020
512

 
$
7,055