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Goodwill and Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
The patents and intangible assets and related change in carrying values are set forth in the tables below:

As of March 31, 2019:
 
Other Intangible Assets
Gross
Accumulated Amortization
Net
Assumed Useful Life
Gentex Patents$36,767,886 $(21,456,037)$15,311,849 various
Other Intangible Assets
HomeLink® Trade Names and Trademarks
$52,000,000 $— $52,000,000 Indefinite
HomeLink® Technology
180,000,000 (82,500,000)97,500,000 12 years
Existing Customer Platforms43,000,000 (23,650,000)19,350,000 10 years
Exclusive Licensing Agreement96,000,000 — 96,000,000 Indefinite
Total Other Intangible Assets$371,000,000 $(106,150,000)$264,850,000 
Total Patents & Other Intangible Assets$407,767,886 $(127,606,037)$280,161,849 


As of December 31, 2018:
Other Intangible Assets
Gross
Accumulated Amortization
Net
Assumed Useful Life
Gentex Patents
$36,737,434 $(21,014,168)$15,723,266 various
Other Intangible Assets
HomeLink® Trade Names and Trademarks
$52,000,000 $— $52,000,000 Indefinite
HomeLink® Technology
180,000,000 (78,750,000)101,250,000 12 years
Existing Customer Platforms43,000,000 (22,575,000)20,425,000 10 years
Exclusive Licensing Agreement
96,000,000 — 96,000,000 Indefinite
Total Other Intangible Assets$371,000,000 $(101,325,000)$269,675,000 
Total Patents & Other Intangible Assets$407,737,434 $(122,339,168)$285,398,266