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Note 9 - Intangible Assets, Net
 9 Months Ended
Sep. 30, 2024
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]

Note 9.  Intangible Assets, net

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Intangible assets consisted of the following for the periods indicated (in thousands):

​

  

September 30, 2024

 

​

 

Gross

  

Accumulated

  

Intangible

 

​

 

Amount

  

amortization

  

assets, net

 

Patents

 $9,788  $(6,278) $3,510 

Trademarks

  202   (49)  153 

Total intangible assets

 $9,990  $(6,327) $3,663 

 

  

December 31, 2023

 

​

 

Gross

  

Accumulated

  

Intangible

 

​

 

Amount

  

amortization

  

assets, net

 

Patents

 $9,502  $(5,981) $3,521 

Trademarks

  138   (31)  107 

Total intangible assets

 $9,640  $(6,012) $3,628 

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For the three months ended September 30, 2024 and 2023, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.1 million and $0.2 million, respectively. For the nine months ended September 30, 2024 and 2023, amortization expense for intangible assets, included in general and administrative expenses on the statement of operations, was $0.3 million and $0.5 million, respectively. The remaining weighted average amortization period for intangible assets is approximately 9 years.

 

On September 30, 2024, future amortization expenses for intangible assets for future periods are estimated to be (in thousands):

 

2024 (remaining 3 months)

 $102 

2025

  442 

2026

  442 

2027

  442 

2028

  442 

2029 and thereafter

  1,793 
  $3,663