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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, net | 10. Intangible Assets, net Intangible assets as of December 31, 2021 and September 30, 2022 consisted of the followings:
|  | December 31, 2021 |  |  | September 30, 2022 |
Computer software at cost |  | $ | 108,560 |  |  | $ | 96,954 |
Sewage discharge permit* |  |  | 1,915,740 |  |  |  | 1,710,918 |
|  |  | 2,024,300 |  |  |  | 1,807,872 |
Accumulated amortization |  |  | (62,561 | ) |  |  | (424,083 | )
|  | $ | 1,961,739 |  |  | $ | 1,383,789 |
Amortization expenses were $1,613 and $121,035 for the three months ended September 30, 2021 and 2022, respectively. Amortization expenses were $4,195 and $397,114 for the nine months ended September 30, 2021 and 2022, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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