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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2018:
Other Intangible Assets | Gross | Accumulated Amortization | Net | Assumed Useful Life
Gentex Patents | $ | 36,352,536 | $ | (19,760,899) | $ | 16,591,637 | various
Other Intangible Assets |  |  |  |
HomeLink® Trade Names and Trademarks | $ | 52,000,000 | $ | — | $ | 52,000,000 | Indefinite
HomeLink® Technology | 180,000,000 | (67,500,000) | 112,500,000 | 12 years
Existing Customer Platforms | 43,000,000 | (19,350,000) | 23,650,000 | 10 years
Exclusive Licensing Agreement | 96,000,000 | — | 96,000,000 | Indefinite
Total Other Intangible Assets | $ | 371,000,000 | $ | (86,850,000) | $ | 284,150,000 |
Total Patents & Other Intangible Assets | $ | 407,352,536 | $ | (106,610,899) | $ | 300,741,637 |
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 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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