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Goodwill
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
(6)
Goodwill
Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2019 are as follows:
 
Balance as of January 1, 2018
  $15,275,264 
Business acquisition (see Note 3)
   10,102,183 
   
 
 
 
Balance as of December 31, 2018
   25,377,447 
Business acquisition (see Note 3)
   3,219,100 
   
 
 
 
Balance as of December 31, 2019
  $28,596,547