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INTANGIBLE ASSETS, NET, AND GOODWILL
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS, NET, AND GOODWILL INTANGIBLE ASSETS, NET, AND GOODWILL
Intangible assets include patent filing costs and other assets (domain name and other intangibles purchased from GVR, including customer relationships, technology and a trademark). Some of the patents were acquired from STI as a result of an asset contribution and were recorded at their carryover basis of $216,000 and are being amortized over the remaining useful life of 1 to 10 years as of December 31, 2020. Intangibles acquired as part of the purchase of GVR were initially recorded at their fair value and are being amortized over a period of 1 to 5 years. Patent filing costs related to issued patents are amortized over the estimated life of the patent, 12 to 20 years, once they are approved by their respective regulatory agency. The domain name is being amortized over the approximate useful life of 10 years.
Intangible assets, net, consists of the following as of December 31, 2020 and 2019 (in thousands):
20202019
Cost:
Patents$2,399 $1,801 
Other (1)
291 274 
2,690 2,075 
Less: Accumulated amortization(571)(499)
Intangible assets, net$2,119 $1,576 
(1)    Includes the impact of foreign currency translation. The total impact at December 31, 2020 was $17,000 and there was no impact at December 31, 2019.    
During the year ended December 31, 2020 and 2019, we wrote-off $383,000 and $145,000, respectively, of patents we abandoned. The write-offs are included in research and development expense.
Amortization of intangible assets was $96,000 and $115,000 for the years ended December 31, 2020 and 2019, respectively. The following table summarizes the estimated amortization expense relating to the intangible assets as of December 31, 2020 (in thousands):
Years ending December 31, 
2021$68,000 
202258,000 
202356,000 
202455,000 
202555,000 
2026 and thereafter551,000 
Total amortization expense$843,000 
Goodwill represents the excess of the purchase price over the fair value of the net assets acquired from GVR Trade. Goodwill is not amortized, but is subject to impairment tests on at least an annual basis and whenever circumstances suggest that goodwill may be impaired.
The change in the carrying amount of goodwill are as follows (in thousands):
Goodwill
Balance at January 1, 2019$817 
Effect of currency translation14 
Balance at December 31, 2019$831 
Effect of currency translation80 
Balance at December 31, 2020$911