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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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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 Platforms | 43,000,000 | (23,650,000) | 19,350,000 | 10 years
Exclusive Licensing Agreement | 96,000,000 | — | 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 Platforms | 43,000,000 | (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 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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