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Intangible Assets, Net | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Intangible Assets, Net | 4. Intangible Assets, Net Intangible assets, net consisted of the following at March 31, 2021 and December 31, 2020:
|  | March 31, 2021 |  | December 31, 2020
|  | Gross Carrying Amount |  | (unaudited) Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents |  | $ | 50,000 |  | $ | (29,375 | ) |  | $ | 20,625 |  | $ | 50,000 |  | $ | (28,750 | ) |  | $ | 21,250
Trade names, trademarks product names, URLs |  |  | 555,000 |  |  | (497,521 | ) |  |  | 57,479 |  |  | 555,000 |  |  | (493,648 | ) |  |  | 61,352
Internally developed software |  |  | 1,990,000 |  |  | (1,990,000 | ) |  |  | — |  |  | 1,990,000 |  |  | (1,990,000 | ) |  |  | —
Subscriber/customer relationships |  |  | 2,279,000 |  |  | (2,022,061 | ) |  |  | 256,939 |  |  | 2,279,000 |  |  | (1,980,392 | ) |  |  | 298,608
Total intangible assets |  | $ | 4,874,000 |  | $ | (4,538,957 | ) |  | $ | 335,043 |  | $ | 4,874,000 |  | $ | (4,492,790 | ) |  | $ | 381,210
Amortization expense for the three months ended March 31, 2021 was $46,167, as compared to $64,084 for the three months ended March 31, 2020. The aggregate amortization expense for each of the next five years and thereafter is estimated to be $138,500 in 2021, $149,944 in 2022, $18,000 in 2023, $17,354 in 2024, $2,500 in 2025 and $8,745 thereafter. | 6. Intangible Assets, Net Intangible assets, net consisted of the following for the periods presented:
|  | December 31,
|  | 2020 |  | 2019
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Patents |  | $ | 50,000 |  | $ | (28,750 | ) |  | $ | 21,250 |  | $ | 50,000 |  | $ | (26,250 | ) |  | $ | 23,750
Trade names, trademarks, product names, URLs |  |  | 555,000 |  |  | (493,648 | ) |  |  | 61,352 |  |  | 555,000 |  |  | (446,479 | ) |  |  | 108,521
Internally developed software |  |  | 1,990,000 |  |  | (1,990,000 | ) |  |  | — |  |  | 1,990,000 |  |  | (1,959,655 | ) |  |  | 30,345
Subscriber/customer relationships |  |  | 2,279,000 |  |  | (1,980,392 | ) |  |  | 298,608 |  |  | 2,279,000 |  |  | (1,813,725 | ) |  |  | 465,275
Total intangible assets |  | $ | 4,874,000 |  | $ | (4,492,790 | ) |  | $ | 381,210 |  | $ | 4,874,000 |  | $ | (4,246,109 | ) |  | $ | 627,891
Amortization expense for the years ended December 31, 2020 and 2019 was $246,681 and $256,332, respectively. The aggregate amortization expense for each of the next five years and thereafter is estimated to be $184,667 in 2021, $149,944 in 2022, $18,000 in 2023, $17,354 in 2024, $2,500 in 2025 and $8,745 thereafter.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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