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Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
Intangible assets consist of the following:
 As of December 31, 2019
 Carrying ValueAccumulated 
Amortization		Net Intangible
Amortizable intangible assets:
Product technology$24,135  $19,798  $4,337  
Patents and trademarks13,726  6,894  6,832  
Customer relationships5,150  2,509  2,641  
Other8,875  8,214  661  
Total$51,886  $37,415  $14,471  
 As of December 31, 2018
 Carrying ValueAccumulated 
Amortization		Net Intangible
Amortizable intangible assets:
Product technology$26,588  $12,332  $14,256  
Patents and trademarks14,647  6,601  8,046  
Customer relationships12,027  2,588  9,439  
Other8,693  7,380  1,313  
Total$61,955  $28,901  $33,054  

As a result of historical and projected financial performance lower than our expectations and changes in our go-forward strategy in connection with our new strategic plan, the estimated fair value of acquired intangibles recognized with the Nutfield, Laser Control Systems, Lanmark and Open Technologies acquisitions were determined to be less than the carrying value of the net carrying value for such assets. We recognized an impairment charge related to such acquired intangibles of $10.5 million in the fourth quarter of 2019. This impairment charge was primarily related to customer relationship and technology intangible assets.
Amortization expense was $5.6 million, $5.4 million and $4.5 million in 2019, 2018 and 2017, respectively. The estimated amortization expense for each of the years 2020 through 2024 and thereafter is as follows:
Years ending December 31,Amount
2020$3,287  
20213,128  
20222,642  
20232,214  
20241,649  
Thereafter1,551  
$14,471