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Goodwill and Intangible Assets, Net
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
The changes in the carrying amount of goodwill for the three months ended March 31, 2019 are as follows:
Balance at December 31, 2018
$
149,585

Foreign currency translation adjustments
1,170

Balance at March 31, 2019
$
150,755


The Company had $13,823 of accumulated impairment losses as of March 31, 2019 and December 31, 2018.
Intangible assets consist of the following as of March 31, 2019:
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Patents, developed technologies and know-how
$
151,887

 
$
(37,671
)
 
$
114,216

Customer relationships
10,700

 
(7,783
)
 
2,917

Trademarks
6,800

 
(3,535
)
 
3,265

In-process research and development
5,470

 
—

 
5,470

Total
$
174,857

 
$
(48,989
)
 
$
125,868


Intangible assets consist of the following as of December 31, 2018:
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Patents, developed technologies and know-how
$
152,482

 
$
(35,133
)
 
$
117,349

Customer relationships
10,700

 
(7,565
)
 
3,135

Trademarks
6,800

 
(3,341
)
 
3,459

In-process research and development
5,348

 
—

 
5,348

Total
$
175,330

 
$
(46,039
)
 
$
129,291


The balance of in-process research and development includes certain in-process research and development technology acquired in the Company's acquisition of Oxitec in September 2015, and amortization will begin once certain regulatory approvals have been obtained for the in-process programs.
Amortization expense was $3,004 and $4,926 for the three months ended March 31, 2019 and 2018, respectively.