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Goodwill and Intangible Assets, Net
 9 Months Ended
Sep. 30, 2021
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 nine months ended September 30, 2021 were as follows:
Balance at December 31, 2020$54,363 
Foreign currency translation adjustments(157)
Balance at September 30, 2021$54,206 
The Company had $43,643 of cumulative impairment losses as of September 30, 2021 and December 31, 2020.
Intangible assets consist of the following as of September 30, 2021:
Gross Carrying AmountAccumulated AmortizationNet
Patents, developed technologies and know-how$92,859 $(37,667)$55,192 
Customer relationships10,850 (10,024)826 
Trademarks5,900 (5,004)896 
Total$109,609 $(52,695)$56,914 
Intangible assets consist of the following as of December 31, 2020:
Gross Carrying AmountAccumulated AmortizationNet
Patents, developed technologies and know-how$96,927 $(34,412)$62,515 
Customer relationships10,850 (9,340)1,510 
Trademarks5,900 (4,529)1,371 
Total$113,677 $(48,281)$65,396 
Amortization expense was $1,874 and $1,913 for the three months ended September 30, 2021 and 2020, respectively, and $5,731 and $5,675 for the nine months ended September 30, 2021 and 2020, respectively.