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Intangible Assets, Net
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
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.