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Goodwill and Acquired Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 are as follows (in thousands):
 
Balance as of December 31, 2016
$
45,347

Goodwill acquired
13,350

Foreign currency translation adjustments
434

Balance as of June 30, 2017
$
59,131
Summary of Intangible Assets Acquired
Acquired intangible assets subject to amortization as of June 30, 2017 and December 31, 2016 consist of the following (in thousands):
 
 
As of June 30, 2017
Cost
 
Accumulated
Amortization
 
Foreign 
Currency Translation Adjustments
 
Net
 
Remaining Useful Life
 
 
 
 
 
 
 
 
(In years)
Developed technology
$
17,200

 
$
(8,376
)
 
$
(93
)
 
$
8,731

 
4.0
Customer relationships
2,210

 
(1,280
)
 
(30
)
 
900

 
2.6
 
$
19,410

 
$
(9,656
)
 
$
(123
)
 
$
9,631

 
 
 
 
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

 
 
Summary of Estimated Future Amortization Expense
Estimated future amortization expense as of June 30, 2017 is as follows (in thousands):
Remainder of 2017
$
1,726

2018
2,736

2019
2,674

2020
1,102

2021
492

Thereafter
901

 
$
9,631