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ACCOUNTS RECEIVABLE, NET (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Credit Loss [Abstract] |  |  |
Accounts receivable | $ 17,199,977 | $ 15,098,733 |
Allowance for doubtful accounts | (605,444) | (1,467,374) | $ (644,090)
Total accounts receivable, net | $ 16,594,533 | $ 13,631,359 |

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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