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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
Intangible assets and Goodwill consisted of the following at December 31:
20192018
Product and license rights$37,400,742  $36,573,941  
Less: accumulated amortization(11,499,141) (8,405,188) 
Total product and license rights25,901,601  28,168,753  
Patents9,882,511  9,428,266  
Less: accumulated amortization(5,127,878) (4,087,273) 
Total patents4,754,633  5,340,993  
Trademarks273,110  154,373  
Less: accumulated amortization(9,020) (9,020) 
Total trademarks264,090  145,353  
Total intangible assets$30,920,324  $33,655,099  
Goodwill$882,000  $784,000  
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:
201920182017
Amortization expense$4,134,557  $2,769,466  $2,436,222  
The expected amortization expense for the Company's current balance of intangible assets are as follows:
Year ending December 31:
2020$4,286,336  
20214,084,702  
20223,530,879  
20233,743,526  
2024 and thereafter15,274,881  
$30,920,324