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Other Intangible Assets and Goodwill
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets and Goodwill Other Intangible Assets and Goodwill
 
The following is a schedule of intangible assets and goodwill as of March 31, 2021:
 TermCarrying
Value		Accumulated Amortization and ImpairmentNet Carrying ValueYear-to-date Amortization
Customer list, Google20 years$8,820,000 $(4,005,751)$4,814,249 $110,250 
Technology5 years3,600,000 (3,000,000)$600,000 180,000 
Customer list, ReTargeter5 years1,931,250 (643,750)$1,287,500 96,562 
Customer list, all other10 years1,610,000 (1,462,453)$147,547 40,251 
Brand name, ReTargeter5 years643,750 (214,583)$429,167 32,188 
Customer relationships20 years570,000 (118,750)$451,250 7,125 
Trade names, web properties (1)-390,000 — $390,000 — 
Intangible assets classified as long-term$17,565,000 $(9,445,287)$8,119,713 $466,376 
Goodwill, total-$9,853,342 $— $9,853,342 $— 

(1)    The trade names related to our web properties have an indefinite life, and as such are not amortized.
Amortization expense over the next five years and thereafter is as follows:
 
2021$1,399,128 
20221,071,294 
2023984,500 
2024769,917 
2025469,500 
Thereafter3,035,374 
Total$7,729,713