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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2018
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 September 30, 2018:
 
Other Intangible Assets
Gross
Accumulated Amortization
Net
Assumed Useful Life
Gentex Patents
$36,152,904 $(20,336,961)$15,815,943 
various
Other Intangible Assets
HomeLink® Trade Names and Trademarks
$52,000,000 $— $52,000,000 
Indefinite
HomeLink® Technology
180,000,000 (75,000,000)105,000,000 12 years
Existing Customer Platforms 43,000,000 (21,500,000)21,500,000 10 years
Exclusive Licensing Agreement 96,000,000 — 96,000,000 
Indefinite
Total Other Intangible Assets
$371,000,000 $(96,500,000)$274,500,000 
Total Patents & Other Intangible Assets
$407,152,904 $(116,836,961)$290,315,943 
As of December 31, 2017:
Other Intangible Assets
Gross
Accumulated Amortization
Net
Assumed Useful Life
Gentex Patents
$34,847,029 $(18,943,554)$15,903,475 
various
HomeLink® Trade Names and Trademarks
$52,000,000 $— $52,000,000 
Indefinite
HomeLink® Technology
180,000,000 (63,750,000)116,250,000 12 years
Existing Customer Platforms
43,000,000 (18,275,000)24,725,000 10 years
Exclusive Licensing Agreement
96,000,000 — 96,000,000 
Indefinite
Total other identifiable intangible assets
$371,000,000 $(82,025,000)$288,975,000 
Total Patents & Other Intangible Assets
$405,847,029 $(100,968,554)$304,878,475