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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
Intangible assets and Goodwill consisted of the following at December 31:
20202019
Product and license rights$38,543,542 $37,400,742 
Less: accumulated amortization(14,709,824)(11,499,141)
Total product and license rights23,833,718 25,901,601 
Patents10,306,922 9,882,511 
Less: accumulated amortization(6,312,460)(5,127,878)
Total patents3,994,462 4,754,633 
Trademarks338,011 273,110 
Less: accumulated amortization(47,875)(9,020)
Total trademarks290,136 264,090 
Total intangible assets$28,118,316 $30,920,324 
Goodwill$882,000 $882,000 
Schedule of expected amortization expense of intangible assets
Amortization expense related to product and license rights, trademarks and patents were as follows for the years ended December 31:
202020192018
Amortization expense$4,434,120 $4,134,557 $2,769,466 
The expected amortization expense for the Company's current balance of intangible assets are as follows:
Year ending December 31:
2021$4,338,247 
20223,691,293 
20233,629,001 
20243,629,001 
2025 and thereafter12,830,774 
$28,118,316