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Goodwill | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | (6) 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 |

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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