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Goodwill (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2018 are as follows:

 
 
 
 
 
Balance as of January 1, 2017
 
$
3,393,234
 
Asset exchange (see Note 3)
 
 
11,882,030
 
Balance as of December 31, 2017
 
 
15,275,264
 
Business acquisition (see Note 3)
 
 
10,102,183
 
Balance as of December 31, 2018
 
$
25,377,447